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  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Thursday, 17 August, 2023 ___ Forecasts for Ireland

    TRENDS remain a little warmer than average and near normal for rainfall and sunshine. Some rather heavy rainfall appears possible around early Saturday morning as a front moves in from the southwest.

    FORECASTS

    TODAY will be partly cloudy to overcast, and warm, feeling rather muggy, with moderate southeast winds 40-60 km/hr by afternoon; highs near 21 C in most regions, could reach 23 C in parts of the midlands and inland west.

    TONIGHT will be overcast with occasional rain, becoming more persistent in southwest towards morning, lows 12 to 15 C.

    FRIDAY intervals of steady rain or showers with chance of thunderstorms, muggy, highs 19 to 21 C. Blustery south winds 40-60 km/hr. Some heavier showers and thunderstorms developing near south coast by evening. Foggy especially over higher terrain in north and west.

    FRIDAY NIGHT will be quite unsettled with outbreaks of heavy and possibly thundery showers, local wind gusts and risk of hail. This band of stormy weather will be moving through fairly rapidly from south to north during the overnight hours. Local rainfalls 15-25 mm. Lows near 14 C.

    SATURDAY partly cloudy, some further showers but clearing mid-day with some sun at times, lows near 14 C and highs near 21 C.

    SUNDAY partly cloudy, showers and sunny breaks, lows near 12 C and highs near 20 C.

    MONDAY sunny with cloudy intervals, isolated showers but these may spread through central counties by afternoon, lows near 11 C and highs near 20 C.

    TUESDAY partly cloudy, showers, lows near 12 C and highs near 21 C.

    Next week in general looks rather unsettled but rainfall amounts may only be moderate and some sunny breaks are also likely. It seems probable that much warmer air will be held in France and perhaps a few parts of southeast England, as a rather extensive trough forms near Ireland and allows a mixing of air masses over both Ireland and most of Britain at times. This outlook could however swing either way towards warmer or cooler and more unsettled, so I wouldn't place great confidence in it at this point.

    My local weather remained hot and the sun was trying to get past rather thick layers of forest fire smoke which originated about 30 km north of us and made air quality dangerously poor (outside at least). This smoke probably prevented a repeat of the 40 C highs but it did make it well into the mid-30s. Timing the arrival of cooler air for late Thursday or early Friday morning, and that will be quite welcome although local storms and wind gusts are not the best prognosis for these gradually spreading fires.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Friday, 18 August, 2023 ___ Forecasts for Ireland

    TRENDS for the week ahead ... rather warm, trending closer to average late next week, overall about 1-2 deg above normal. Rainfall near normal for most but 25 to 50 per cent above normal in west Munster and parts of Connacht, much of this expected later today. Sunshine will keep pace with late August average values near 4.5 hours a day.

    FORECASTS

    TODAY will be rather warm and muggy with southeast winds 40-60 km/hr. Outbreaks of rain will come and go, with brief brighter spells between them. Some heavy and possibly thundery showers will push into west Munster by mid to late afternoon; highs 18 to 22 C. Rainfalls in parts of west Munster 20-30 mm could create spot flooding especially near mountains.

    TONIGHT will be quite unsettled and in some places briefly stormy, with outbreaks of heavy and possibly thundery showers, local wind gusts to 80 km/hr, and risk of hail. This band of stormy weather will be moving through fairly rapidly from south to north during the overnight hours. Local rainfalls 15-25 mm in central and northern counties. Lows near 14 C.

    SATURDAY partly cloudy, some further showers but clearing mid-day with some warm sunny breaks, lows near 14 C and highs near 21 C.

    SUNDAY partly cloudy, showers and sunny breaks, lows near 12 C and highs near 20 C.

    MONDAY sunny with cloudy intervals, isolated showers but these may spread through central counties by afternoon, lows near 11 C and highs near 20 C.

    TUESDAY partly cloudy, showers, lows near 12 C and highs near 21 C.

    WEDNESDAY and THURSDAY will turn cooler with frequent showers and northerly breezes, lows near 12 C and highs near 18 C.

    From there to end of August, generally rather cool and unsettled but there could be brief dry intervals that allow for more moderate temperatures.

    My local weather remained hot and dry with decreasing smoke haze as winds slowly picked up from a southerly direction, highest temperatures around 35 C but as low pressure forms over the region tonight, temperatures have stayed quite high with the wind mixing the air and allowing superheated air from central WA state into the region. It is still 32 C (!) at 11 p.m. here. A strong front is forming across central Alberta and BC, and that may set off thunderstorms here around 0800h after which I am expecting strong wind gusts from the northeast. It should then turn cooler after staying warm all night. We are lucky not to have any active fires near us, but other parts of B.C. are seeing emergency evacuations as fires start spreading faster with these windy, hot conditions.

    Meanwhile, Hurricane Hilary in the Pacific west of Mexico, now a major cat-4 storm, is taking a rather unusual track north towards southern California. There may be a landfall but at only tropical storm intensity near Los Angeles or San Diego on Sunday. Rain from this tropical storm will spread into many parts of the western U.S. and we may even see some here. The heat will rapidly reposition further east over the plains states, and will begin to make its presence felt in most eastern states by Monday.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Update ___ Friday, 18 August, 2023 ___ 9 p.m.

    Some added details on timing and intensity, on recently named storm Betty approaching south coast this evening. Guidance suggests a brief interval of very strong winds over marine areas south of Cork to Wexford reaching Force 11, and this may also mean that some coastal areas on land will see local gusts to 110 km/hr around midnight to 0300h. Coastal flooding is quite possible near high tides tonight as we are close to the new moon. Some urban flooding in Cork is being caused by interactions of heavy rainfalls (40-50 mm reported) and higher tides slowing down the runoff into the ocean. These conditions are likely to spread east towards Wexford and the strongest coastal impacts may prove to be around east Munster and south Leinster.

    The low will track northeast towards central counties of Ireland and these stronger winds will try to move inland but away from the south coast I think the dynamics will be moderate rather than strong and wind gusts will generally be into the 70-90 km/hr range. Isolated higher gusts are possible at any time associated with the line of showers and thunderstorms now moving into the southeast. These comments apply also to the Dublin and east coast regions in general.

    The stormy weather will rapidly moderate after 0300h except in parts of Ulster where it will begin to improve after 0600h.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Saturday, 19 August, 2023 ___ Forecasts for Ireland

    TRENDS for the week ahead will be generally close to normal values in all aspects (from this hour, if including all hours of today, a little wetter).

    FORECASTS

    TODAY will be windy with further squally showers and a few sunny breaks developing, more frequent by afternoon as the strong winds ease gradually from southwest 50-80 km/hr this morning, to 40-60 km/hr by afternoon; highs 18 to 22 C.

    TONIGHT will be partly cloudy with a few brief showers, mild, lows 12 to 14 C.

    SUNDAY will be partly cloudy with showers generally more isolated, moderate south to southwest breezes, highs 19 to 22 C.

    MONDAY and TUESDAY both similar, partly cloudy, a few showers and lows 11 to 13 C, highs 18 to 21 C.

    WEDNESDAY partly cloudy to overcast, showers, a bit cooler, lows near 10 C and highs 17 to 20 C.

    From mid-week to weekend of 26th-27th and probably on into the following week, somewhat cooler with frequent showers in a moderate northerly air flow, tending to become more easterly near start of September. In general, highest temperatures in the 15 to 18 C range.

    My local weather turned a bit cooler with northerly breezes kicking in around mid-morning, intervals of rather dense smoke haze from large fires about 150 km to our west, and a bright red sun most of the day with some higher cloud as well as the smoke haze. Afternoon temperatures began to fall from 27 C towards current value of 14 C at 11 p.m. ... would be nice to let that cooler air blow in, but preferring to keep the smoke out for now. Severe heat will now transfer to central plains states and the west will get a reprieve, followed by arrival of remnants of Pacific Hurricane Hilary after expected Sunday landfall in southern California.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Sunday, 20 August, 2023 ___ Forecasts for Ireland

    TRENDS will be close to normal values in all aspects.

    FORECASTS

    TODAY will be partly cloudy, with showers and isolated thunderstorms developing by afternoon; highs 19 to 22 C.

    TONIGHT will be partly cloudy with clear intervals developing after midnight, lows 11 to 13 C.

    MONDAY will be partly cloudy to overcast with a few showers, more persistent in Connacht and Ulster; highs 18 to 21 C.

    TUESDAY and WEDNESDAY, little change, partly cloudy, occasional showers, lows near 10 C and highs near 20 C.

    By T URSDAY, somewhat cooler as winds turn more northerly, showers or intervals of light rain, lows near 9 C and highs near 18 C.

    FRIDAY and WEEKEND 26th-27th will continue rather cool and showery with a slow improving trend with fewer showers and longer sunny breaks by Sunday, lows 7 to 10 C and highs 15 to 18 C.

    The following week appears likely to be variable, temperatures generally near or a little below normal with highs around 17 C, and several outbreaks of rain likely from passing disturbances and possibly some strong westerly winds at times.

    My local weather cooled off considerably with a smoky but otherwise clear day, sun dimly visible through the haze and very poor air quality. The high was about 20 C. Southern California and parts of Nevada will get an unusually heavy rainfall from approaching Pacific Hurricane Hilary expected to make landfall around Tijuana or San Diego this afternoon local time (around midnight IST). Will contribute some observation details to the forum thread. The hurricane is currently weakening gradually as it moves up the west coast of Mexico's Baja California region.



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  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Monday, 21 August, 2023 ___ Forecasts for Ireland

    TRENDS remain rather bland and close to average, possibly a bit less than normal amounts of rainfall.

    FORECASTS

    TODAY will be sunny in some parts of the south and central counties this morning, becoming partly cloudy to overcast with a few showers, more persistent in Connacht and Ulster; highs 18 to 21 C. Rainfalls about 2-5 mm.

    TONIGHT will be partly cloudy to overcast with occasional rain, again more persistent in north, lows 10 to 13 C.

    TUESDAY and WEDNESDAY, little change, partly cloudy, occasional showers, lows near 10 C and highs near 20 C.

    By THURSDAY, somewhat cooler as winds turn more northerly, showers or intervals of light rain, lows near 9 C and highs near 18 C.

    FRIDAY and WEEKEND 26th-27th will continue rather cool and showery with a slow improving trend with fewer showers and longer sunny breaks by Sunday, lows 7 to 10 C and highs 15 to 18 C.

    The following week appears likely to be variable, temperatures generally near or a little below normal with highs around 17 C, and several outbreaks of rain likely from passing disturbances and possibly some strong westerly winds at times. Tuesday 29th and Friday 1st September are currently the timing for frontal passages; Monday 28th and Thursday 31st more likely to be dry and settled days.

    My local weather was sunny with moderate smoke haze, and a bit warmer again with a high near 25 C. Pacific Hurricane Hilary moved inland as expected near Tijuana and San Diego on Sunday afternoon local time. Rainfalls of 30-50 mm were widespread and 100-150 mm in some of the local mountain ranges; quite cool for the desert southwest region, especially in Nevada where some locations had record low daytime highs in the 14 to 18 C range (Las Vegas 26 C). Severe heat continues in the central regions of the U.S. and a brief extension of that heat to the east coast will take place today before cooler high pressure pushes it away to the south.

    The Atlantic is slowly becoming more active and some hurricanes appear possible in about ten days to two weeks, in the vicinity of Bermuda and eastern Canada. Remnants of those could get into the weather picture for Ireland eventually (mid-September possibly).



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Tuesday, 22 August, 2023 ___ Forecasts for Ireland

    TRENDS ... Temperatures will be slowly settling back to cooler than average, by 1-2 deg. Rainfall rather showery and will amount to about half of normal for most places. Sunshine will keep pace wit late August averages.

    FORECASTS

    TODAY partly cloudy and warm in the south with highs near 22 C. Overcast in the north with occasional rain, highs near 19 C.

    TONIGHT will be partly cloudy to overcast with occasional rain spreading in from the south, some dry intervals central and northern counties, lows 12 to 14 C.

    WEDNESDAY, occasional showers, gradually clearing, highs 18 to 21 C.

    By THURSDAY, somewhat cooler as winds turn more northwesterly, dry in some parts of the east and south, showers or intervals of light rain near west and north coasts, lows near 9 C and highs near 18 C.

    FRIDAY, partly cloudy to overcast, cool, showers becoming more frequent in west and north, lows near 8 C and highs near 16 C.

    SATURDAY partly cloudy, cool, scattered showers, lows near 8 C and highs near 16 C.

    SUNDAY occasional rain, partial clearing by afternoon and evening, cool. Lows near 10 C and highs 15 to 17 C.

    MONDAY variable cloud, showers, lows near 10 C and highs 15 to 17 C.

    TUESDAY intervals of rain may turn heavy at times in south, lows near 11 C and highs 15 to 17 C.

    This rather drab weather pattern (drab by early next week at least) will likely continue with slight improvements possible, into early September.

    My local weather remained hazy due to forest fire smoke, and highs were around 23 C. Cloud is slowly spreading in from the south and a few outbreaks of light rain are expected, from outer portions of the weak and disorganized remnants of the recent hurricane (tropical storm at landfall) to our south. There isn't much left of this circulation other than some bands of cloud and light rain in the Pacific northwest. Severe heat continues in the south central plains states and made a bit of a move east on Monday but is now being pushed back west by cooler high pressure over the Great Lakes region.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Wednesday, 23 August, 2023 ___ Forecasts for Ireland

    TRENDS ... Temperatures will be slowly settling back to cooler than average, by 1-2 deg. Rainfall rather showery but will eventually reach near normal weekly totals when heavier rain arrives by next Tuesday. Sunshine falling back to around 75% of normal, or about three hours a day on average, possibly less in some areas.

    FORECASTS

    TODAY variable cloud with occasional showers, more persistent in southeast while skies may be gradually clearing further west and north this afternoon, highs 17 to 20 C.

    TONIGHT partly cloudy, isolated brief showers, lows 8 to 11 C.

    THURSDAY, somewhat cooler as winds turn more northwesterly, dry intervals in some parts of the east and south, showers or intervals of light rain near west and north coasts, and highs near 18 C.

    FRIDAY, partly cloudy to overcast, cool, showers becoming more frequent in west and north, lows near 8 C and highs near 16 C. Moderate northwest to northerly breezes 30-50 km/hr.

    SATURDAY partly cloudy, cool, scattered showers, lows near 8 C and highs near 16 C.

    SUNDAY occasional rain, partial clearing by afternoon and evening, cool. Lows near 10 C and highs 15 to 17 C.

    MONDAY variable cloud, showers, lows near 10 C and highs 15 to 17 C. Rain becoming heavier in Connacht and Ulster by afternoon and evening.

    TUESDAY intervals of rain may turn heavy at times in south and east as the disturbance slowly progresses, lows near 11 C and highs 15 to 17 C.

    WEDNESDAY (30th) showers followed by partial clearing, cool, breezy, lows near 8 C, highs 14 to 16 C.

    Some improvements briefly near end of month but another wet spell (you guessed it) around weekend of 2-3 September. Guidance advises this could be a fairly heavy rainfall, but timing is uncertain (except for the calendar aspect), and a drier interval may follow with temperatures recovering a little in the first full week of September.

    My local weather turned quite cool and damp, with occasional light rain, mist and fog, mixing with the smoke haze which was gradually improving as the distant fires begin to diminish. It was only around 17 C for a high, much cooler than most days this summer here. Severe heat continues in the south central U.S. with pleasant dry and not overly hot weather in the eastern regions, all associated with nearly stationary high pressure in the upper levels over Iowa and Illinois, where the maturing corn crop is "sweating" moisture to create abnormally high dew points above 28 C in some places, in the stagnant heat wave.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Thursday, 24 August, 2023 ___ Forecasts for Ireland

    TRENDS remain rather close to normal in all respects, as Ireland remains in a transitional zone between very warm air over France and cooler polar origin air masses to the north. The pattern is rather low energy and fronts are only strong well to the south; severe storms have broken out near the French coast heading for Belgium. Over the next few days the heat over Europe will fade gradually but cooler air is not rushing in, and the circulation locally will remain generally westerly with shallow incursions of cooler air at times. Overall, it will be rather bland weather with scattered outbreaks of light rain alternating with partly cloudy spells.

    FORECASTS

    TODAY will be partly cloudy to overcast at times, with a few isolated showers becoming a bit more frequent by afternoon near Atlantic coasts; highs 16 to 19 C.

    TONIGHT will be partly cloudy to overcast with occasional light rain mostly in western and northern counties. Some fog and mist likely. Lows around 8 C.

    FRIDAY will become more unsettled with rather widespread showers developing across Ulster. Connacht and inland Leinster, eventually spreading to south and east coasts by afternoon. About 3-7 mm of rain is likely for most locations. Winds moderate northwest with a few stronger gusts near Atlantic coasts. Cool, highs only 14 or 15 C in west and north, 16 C east and south.

    SATURDAY will continue cool and breezy with more outbreaks of showery rain and possibly an isolated thunderstorm. Conditions may begin to improve gradually by afternoon as winds back more to westerly. Lows near 10 C and highs near 16 C.

    SUNDAY partly cloudy with longer sunny intervals, a bit warmer, lows near 9 C and highs near 19 C.

    MONDAY will start out relatively dry with increasing cloud and scattered showers by afternoon and evening. This weak disturbance will continue into TUESDAY with moderate west to northwest breezes, lows both days 8 to 10 C, highs near 17 C.

    The rest of the week will bring on further weak disturbances so would expect little change to the variable weather pattern, a bit of sun at times, and occasional mostly light rainfall. Temperatures will remain in a similar range (days near 18 C, nights near 10 C).

    My local weather started with a brief heavy thunderstorm at 0830h and it then alternated between partly cloudy and overcast with brief showers as the moisture brought north by the recent Pacific storm eddies around in a weak upper trough pattern. It was a bit warmer, at 21 C. Meanwhile, Chicago had their hottest day of the summer with a high of 98 F (37 C), and it was over 100F in many parts of the central U.S.; cooler east of the frontal boundary running from about Cleveland to North Carolina, and it will take several days for the stagnant mass of hot air to make any new eastward moves. Tropical storm Franklin has tracked across the Dominican Republic and threatens to become a major hurricane near Bermuda with future potential impacts on eastern Canada in about a week to ten days. Franklin is expected to move north towards western Greenland eventually and probably will not head anywhere near Ireland but that of course could change.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Friday, 25 August, 2023 ___ Forecasts for Ireland

    TRENDS remain rather close to normal in all respects with a tendency towards cool and unsettled but not enough so to produce much of a departure from average.

    FORECASTS

    TODAY will become mostly cloudy with rather widespread showers developing across Ulster. Connacht and inland Leinster, eventually spreading to south and east coasts by afternoon. About 2-5 mm of rain is likely for most locations. Winds moderate northwest 40-60 km/hr with a few stronger gusts near Atlantic coasts. Cool, highs only 14 or 15 C in west and north, 16 C east and south.

    TONIGHT will be partly cloudy to overcast with occasional light rain and moderate northwest to north winds, lows 8 to 10 C.

    SATURDAY will continue cool and breezy with more outbreaks of showery rain and possibly an isolated thunderstorm. Conditions may begin to improve gradually by afternoon as winds back more to westerly. Lows near 10 C and highs near 16 C. Rain overnight into Sunday morning will amount to 5-10 mm.

    SUNDAY rain ending, breezy and partly cloudy with longer sunny intervals, becoming a bit warmer, lows near 9 C and highs near 19 C.

    MONDAY will start out relatively dry with increasing cloud and scattered showers by afternoon and evening. This weak disturbance will continue into TUESDAY with moderate west to northwest breezes, lows both days 8 to 10 C, highs near 17 C. The heaviest rainfalls (about 5-10 mm) from this event appear likely to be overnight into early Tuesday and over Connacht and west Ulster as the system may begin to fragment further east.

    The rest of the week will bring on further weak disturbances so would expect little change to the variable weather pattern, a bit of sun at times, and occasional mostly light rainfall. Temperatures will remain in a similar range (days near 18 C, nights near 10 C).

    My local weather was hazy but with less smoke, and more bright sunshine, warmer at about 25 C. It remained very hot in the Midwest U.S. states with Chicago hitting 100 F (38 C) for the first time since July, 2012. It was well over that in Kansas (near 42 C).



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  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Saturday, 26 August, 2023 ___ Forecasts for Ireland

    TRENDS will be generally rather cool and unsettled with limited sunshine but even so, most values will end up fairly close to normal for late August going into early September.

    FORECASTS

    TODAY will continue cool and breezy with more outbreaks of showery rain and possibly an isolated thunderstorm. Conditions may begin to improve gradually by afternoon as winds back more to westerly. Lows near 10 C and highs near 16 C.

    TONIGHT intervals of rain lasting into Sunday morning will amount to 5-10 mm. Some mist and fog developing, lows 9 to 11 C.

    SUNDAY rain ending gradually by mid-day, becoming breezy and partly cloudy with longer sunny intervals by afternoon, becoming a bit warmer, and highs near 19 C.

    MONDAY will start out relatively dry with increasing cloud and scattered showers by afternoon and evening. This weak disturbance will continue into TUESDAY with moderate west to northwest breezes, lows both days 8 to 10 C, highs near 17 C. The heaviest rainfalls (about 3-5 mm) from this event appear likely to be overnight into early Tuesday and over Connacht and west Ulster as the system may begin to fragment as it moves further east.

    WEDNESDAY and THURSDAY will be partly cloudy with isolated showers, lows around 5 to 8 C and highs around 17 C.

    FRIDAY will bring increasing cloud and rain by late in the day, highs near 19 C.

    The weekend of 2-3 Sep currently looks unsettled with low pressure slowly moving past Ireland to the south then edging north into Britain, causing winds to back around to northeast in Ireland for part of the weekend, so it will likely be rather cool also. More slowly rotating low pressure systems are predicted to follow as the region remains in a long-wave trough pattern with high pressure likely to be distant over the south central Atlantic and eastern Europe.

    My local weather on Friday was partly to mostly cloudy and we had some very light rain for a while around late afternoon, with highs near 25 C. It is expected to clear up for the weekend and turn quite hot again (near 30 C). The severe heat in central regions of the U.S. is slowly being moderated by fronts edging south and creating some locally heavy and severe storms with brief torrential downpours noted in parts of the Midwest.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Sunday, 27 August, 2023 ___ Forecasts for Ireland

    TRENDS are rather cool, wet and cloudy for the week ahead.

    FORECASTS

    TODAY a band of rain will gradually spread through eastern counties and will begin to clear away from western counties this morning. Partly cloudy in central regions by afternoon, rain tapering to drizzle in Leinster after 3-7 mm falls; highs 15 to 17 C.

    TONIGHT partly cloudy, dry, lows 8 to 11 C.

    MONDAY will be partly cloudy and generally dry, with highs around 18 C.

    TUESDAY sunny with cloudy intervals and passing showers, lows 8 to 10 C, highs near 17 C.

    WEDNESDAY increasing cloud, rain by afternoon or evening from west to east, lows 6 to 8 C and highs near 18 C.

    THURSDAY rain ending from west to east by mid-day, sunny spells developing, lows near 11 C and highs near 18 C.

    FRIDAY variable cloud, a few showers, lows near 10 C and highs near 19 C.

    WEEKEND of 2-3 SEP looks variable and rather warm with occasional rain and some sunny breaks, lows near 12 C and highs 19 to 22 C.

    A gradual trend towards drier and more settled weather may follow as high pressure begins to dominate, causing the jet stream to split into two branches steering some disturbances well to the south and others further north. Temperatures are looking near normal in that interval.

    The heaviest rainfalls (about 5-10 mm) from this event appear likely to be overnight into early Tuesday and over Connacht and west Ulster as the system may begin to fragment further east.

    My local weather was sunny and very warm on Saturday with a high near 28 C.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Monday, 28 August, 2023 ___ Forecasts for Ireland

    TRENDS ... temperatures will slowly rise to 1-3 deg above normal later in this coming week, rainfalls will be about half of normal values, mostly confined to late Wednesday and Thursday, and sunshine may manage to keep pace with seasonal average values near 4h per day.

    FORECASTS

    TODAY will be partly cloudy and generally dry, with highs around 18 C. Somewhat cloudier in Connacht, Ulster, with scattered showers giving 1-2 mm rainfalls locally.

    TONIGHT partly cloudy to overcast, mostly dry, lows 8 to 11 C.

    TUESDAY sunny with cloudy intervals and isolated passing showers, lows 8 to 10 C, highs near 17 C.

    WEDNESDAY increasing cloud, rain by afternoon or evening from west to east, lows 6 to 8 C and highs near 18 C.

    THURSDAY rain ending from west to east by mid-day, sunny spells developing, lows near 11 C and highs near 18 C.

    FRIDAY variable cloud, a few showers, morning fog may be persistent in valleys for a while, sunny breaks later, with lows near 10 C and highs near 19 C.

    WEEKEND of 2-3 SEP looks variable and rather warm with occasional rain and some sunny breaks, lows near 12 C and highs 19 to 22 C. Some chance of locally heavy showers or thunderstorms by Saturday night, especially near east coast.

    A gradual trend towards drier and more settled weather may follow as high pressure begins to dominate, causing the jet stream to split into two branches steering some disturbances well to the south and others further north. Temperatures are looking near normal in that interval although perhaps a bit above especially for inland southeast.

    My local weather on Sunday was mostly sunny and hot with highs around 31 C. As Franklin intensifies northeast of the Bahamas towards cat-3 intensity, Idalia has formed near western Cuba and is poised to move north into the eastern Gulf of Mexico with a hurricane landfall predicted for north central Florida around mid-week. Scorching heat continues in the south central states with Houston at 43 C (109 F) near its all-time high, and New Orleans at 41 C, unusual for that location.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Tuesday, 29 August, 2023 ___ Forecasts for Ireland

    TRENDS ... temperatures will slowly rise to 1-3 deg above normal later in this coming week, rainfalls will be about half of normal values, mostly confined to late Wednesday and Thursday, and sunshine may manage to keep pace with seasonal average values near 4h per day.

    FORECASTS

    TODAY partly cloudy to sunny at times, with some cloudy intervals and isolated passing showers, lows 8 to 10 C, highs near 17 C.

    TONIGHT partly cloudy to overcast, lows 6 to 9 C.

    WEDNESDAY some morning bright spells then increasing cloud, rain by afternoon or evening from west to east, and highs near 18 C.

    THURSDAY rain ending from west to east by mid-day, sunny spells developing, lows near 11 C and highs near 18 C.

    FRIDAY variable cloud, a few showers mainly over southern counties by afternoon, in a variable northeast breeze, morning fog may be persistent in valleys for a while due to slack winds, sunny breaks more widespread later, with lows near 10 C and highs near 19 C.

    WEEKEND of 2-3 SEP continues to look better and now could be mostly sunny apart from lingering morning fog or low cloud, and a bit warmer too, lows 6 to 10 C and highs 19 to 23 C. The earlier indication of locally heavy showers or thunderstorms by Saturday night, near east coast, has been dropped for now as high pressure seems to be stronger. This is a good thing since remnants of Franklin have been showing a gradual tendency to aim more for Iceland than Greenland in recent model runs but this ridge should direct Franklin to an arctic grave.

    A gradual trend towards drier and more settled weather may follow as high pressure begins to dominate, causing the jet stream to split into two branches steering some disturbances well to the south and others further north. Temperatures are looking near normal in that interval although perhaps a bit above especially for inland southeast.

    My local weather on Monday was sunny, quite hazy and hot with a high near 33 C. Pleasant overnight, clear with a very low-hanging nearly full moon, Saturn to its left and Jupiter just rising in the haze at 10:30 p.m. Jupiter will become a very prominent object in clear skies this autumn as we overtake it around early November. Meanwhile, hurricane Franklin has reached cat-4 intensity west of Bermuda but fortunately its track avoids major disruptive landfalls on its way past Newfoundland towards east Greenland (that will be intense but in an almost uninhabited portion of Greenland). Bermuda could get some near-hurricane force gusts as Franklin motors past.

    Idalia will soon be a hurricane west of Fort Myers and Tampa Bay later today and into tonight, and may make a landfall as a cat-3 hurricane around Wednesday in north central Florida, feeding off 30C Gulf waters. It does not look like a direct hit on the Tampa-St Petersburg metro area but storm surge issues may be significant with tropical storm force south winds at least, pushing water into Tampa Bay. A much more dangerous potential exists further north. Cedar Key north to Steinhatchee will need to prepare for a damaging landfall late tonight or early Wednesday. But these storms can change course late in the interval before landfall, as was the case with intense Charley in August, 2004 (not the one that hit Ireland in 1986, name re-used until this one retired it).



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Wednesday, 30 August, 2023 ___ Forecasts for Ireland

    TRENDS ... temperatures will slowly rise to 1-3 deg above normal later in this coming interval, rainfalls will be about half of normal values, mostly confined to later today and Thursday, and sunshine may eventually pile up a decent total after a weak start.

    FORECASTS

    TODAY some morning bright spells then increasing cloud, rain by afternoon or evening from west to east, and highs near 18 C.

    TONIGHT rain becoming heavy at times, spreading to east coast by early morning, 5-15 mm amounts likely, lows 10 to 12 C.

    THURSDAY rain ending from west to east by mid-day, sunny spells developing in morning for Connacht and Munster, and by afternoon in Leinster and most of Ulster, remaining cloudy to evening in north Leinster and east Ulster, with highs near 18 C.

    FRIDAY variable cloud, a few showers mainly over southern counties by afternoon, in a variable northeast breeze, morning fog may be persistent in valleys for a while due to slack winds, sunny breaks more widespread later, with lows near 10 C and highs near 19 C.

    WEEKEND of 2-3 SEP partly cloudy mornings, mostly sunny afternoons, with some lingering morning fog or low cloud, and a bit warmer by day although cooler nights under clear skies, lows 6 to 10 C lowest values inland valleys, and highs 19 to 23 C, highest west-central counties.

    Dry and settled weather is indicated to persist most of the following week, ending with the arrival of slow-moving low pressure from the south around Friday 8th but staying warm with highs all week around 22 to 24 C away from some cooler coastal areas. Many weather watchers are thinking it could be as warm a September as June turned out.

    Franklin continues to move along steadily in the Gulf stream and may miss its first opportunity to phase with the lows in the jet stream further north but eventually its remnants will probably crash into Greenland and/or Iceland. Idalia meanwhile is gradually intensifying and looks set to make a landfall in very sparsely populated coastal marshes northwest of Steinhatchee, FL, as a strong cat-3 or even weak cat-4 hurricane. It will pass over Valdosta GA tomorrow in a somewhat weakened condition and then run up the Georgia and Carolina coasts, with many different forecast scenarios in different models after the Labor Day weekend. Remnants of it could eventually reach western Europe in almost two weeks after it meanders around, but there's also a possibility it will complete a loop and return (like Ivan 2004) to eastern FL as a weak tropical storm.

    My local weather on Tuesday became cloudy, with rain off to our south and west only now beginning to reach us. It stayed sunny, hazy and hot just a few miles east of here as we found out by going there to play golf. So at mid-afternoon it was 30 C a few miles east, 23 C here and 15 C in the rain further west. Despite that very strong frontal contrast, the rain is rather sporadic and quite variable in amounts and intensity, with a look of thunderstorms forming on radar now. We could use the rain but not the lightning.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Thursday, 31 August, 2023 ___ Forecasts for Ireland

    TRENDS ... temperatures will slowly rise to 1-3 deg above normal later in this coming interval, rainfalls will be about 35% of normal values, mostly confined to later today and Friday (in the south), and sunshine may eventually reach 25 to 50 per cent above average despite today's cloudy start.

    FORECASTS

    TODAY rain ending from west to east by mid-day, with some showers lingering in east and north; sunny spells developing this morning for Connacht and Munster, and by afternoon in Leinster and most of Ulster, remaining cloudy to evening in north Leinster and east Ulster, with highs near 18 C.

    TONIGHT a few clear intervals, but cloudy across parts of the south, a few showers. Lows 8 to 11 C.

    FRIDAY variable cloud, a few showers mainly over southern counties by afternoon, in a variable northeast breeze, morning fog may be persistent in valleys for a while due to slack winds, sunny breaks more widespread later, with highs near 19 C.

    SATURDAY after some patchy fog and low cloud, sunny breaks developing, warm especially inland, lows 6 to 9 C and highs 19 to 22 C.

    SUNDAY another cloudy or foggy start, low cloud rather persistent near west and north coasts, hazy and warm sunshine at times elsewhere, lows 6 to 9 C and highs 18 to 23 C.

    Dry and settled weather is indicated to persist most to mid-week, ending with the arrival of (not as) slow-moving low pressure from the south around Wednesday 6th but staying warm with highs all week around 21 to 24 C away from some cooler coastal areas. Remnants of Franklin will continue to drift east to about 28 deg W before turning north and linking to the system crossing Ireland from a southern origin, to form eventually into one distant low near Iceland late in the week. Remnants of Idalia could meander through the central Atlantic for almost two weeks before energizing low pressure and that result could show up in Ireland around two weeks from now, after another settled interval around the weekend of 9th-10th. Many weather watchers are thinking it could be as warm a September as June turned out.

    My local weather was cloudy with some steady rain all morning (10-15 mm) and a very low cloud ceiling making it foggy on hills nearby. The high was only about 16 C and it felt like autumn but we are due to go back into warm and dry conditions gradually towards the weekend.

    Idalia made its landfall as expected near Keaton Beach, FL and has already reached the coast of North Carolina. It will now slow down, drift southeast, then circle back around west of Bermuda for several days as a weak tropical storm. Franklin is chugging along to the north of Bermuda and the two storms are now not all that far apart but seem destined not to meet. Another tropical storm will form in the eastern Atlantic and feed into the low mentioned for Ireland next week. Also another hurricane is indicated for the western Atlantic in about a week to ten days.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Friday, 1 September, 2023 ___ Forecasts for Ireland

    TRENDS ... temperatures will rise to 2-4 deg above normal later in this coming interval, rainfalls will be about 25% of normal values, mostly confined to later today in some parts of the south, and sunshine may eventually reach 25 to 50 per cent above average despite today's cloudy start. Fog will be widespread most mornings, forming after midnight, and sunshine may eventually reach 25 to 50 per cent above average despite today's variable cloudiness; sunshine may be less frequent near Atlantic coasts.

    FORECASTS

    TODAY variable cloud, fog and mist gradually lifting, a few showers mainly over southern counties by late morning and afternoon, in a variable northeast breeze, sunny breaks more widespread later, best in north midlands; highs 18 to 20 C.

    TONIGHT a few clear intervals, low cloud and fog, mist developing in many areas after midnight, lows 7 to 11 C.

    SATURDAY after some patchy fog and low cloud, sunny breaks developing, warm especially inland, lows 6 to 9 C and highs 19 to 22 C.

    SUNDAY another cloudy or foggy start, low cloud rather persistent near west and north coasts, hazy and warm sunshine at times elsewhere, lows 6 to 9 C and highs 18 to 23 C.

    MONDAY and TUESDAY sunny, hazy and very warm, locally hot, highs 22 to 26 C. Some fog near coasts. Morning lows around 10 C in widespread fog and mist that may linger in some coastal areas. Moderate southeast breezes will develop each afternoon.

    By WEDNESDAY and into THURSDAY, partly cloudy, warm and humid, scattered showers and isolated thunderstorms, mostly over inland regions as coastal sea breezes will keep conditions more stable and provide boundaries inland for these storms to exploit. Both days will see highs around 23 C and nights will be muggy, lows 12 to 15 C.

    FRIDAY 8th and SATURDAY 9th will see little change as blocking breaks down slowly and warm, humid air left behind by various tropical weather systems can move into Ireland on a southwest flow, with temperatures still well into the 20s at least away from Atlantic coasts, and passing weak frontal troughs producing "splash and dash" showers.

    By about SUNDAY 10th, becoming more windy with more persistent rainfalls, and the following week may continue in that theme, but forecast models are challenged by the erratic movements of remnants of Idalia in the central Atlantic and various other potential tropical storms or hurricanes that may be forming closer to the tropics and moving north. There is probably some chance of a better outcome than some guidance will be showing since it's quite possible that the blocking high signal for this week may have some lingering influence for several more weeks. If you're looking at model guidance and wondering about potential for remnants of tropical storms to create windy or very windy weather later in the month, this is always a possibility but very difficult to predict and models don't do all that well resolving actual tracks, as we're seeing with Franklin -- a few days ago, Franklin was supposed to move rapidly past Newfoundland and turn north, but since then it has slowed down, will take several days to reach the central Atlantic, and then move due north to a point west of Iceland by late in the week. Forecasts for Idalia are probably not very reliable either and remnants of that storm could be almost anywhere in the Atlantic basin in a week to ten days. There are a lot of minor systems hanging around and various combinations of them are possible, then there will be new storms forming. It's basically chaos theory in action.

    My local weather on Thursday remained cloudy and cool with a bit more rain but later Friday it should start to clear up and we'll enjoy a very warm and sunny Labour Day weekend. The central states continue to bake in widespread heat but that is gradually beginning to spread further east and there could be near heat wave conditions in the eastern U.S. by next week with highs about 32 to 35 C likely.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Saturday, 2 September, 2023 ___ Forecasts for Ireland

    TRENDS ... very warm and generally dry to mid-week then some scattered outbreaks of locally heavy thundery showers, amounts quite variable, likely to be heaviest inland west and north at first, then near east coast. Sunshine fairly generous although low cloud and morning fog will cut into totals in some places.

    FORECASTS

    TODAY will start out cloudy and foggy or misty in places, with sunshine gradually breaking through, warm and rather calm by mid-day and afternoon, highs 19 to 23 C.

    TONIGHT will be clear in places to about midnight and then low cloud and fog patches will become widespread, lows 8 to 11 C.

    SUNDAY hazy sunshine in most places by mid-day, more persistent low cloud and drizzle or fog near some western coasts; highs 19 to 23 C.

    MONDAY foggy morning, hazy sunshine later, quite warm, lows near 10 C and highs 21 to 25 C.

    TUESDAY some fog patches, hazy sunshine following, very warm. Lows near 12 C, highs near 25 C inland, 19 to 23 C coastal areas.

    WEDNESDAY variable cloud, warm, thundery showers by afternoon in a few locations, lows near 14 C, highs near 24 C.

    THURSDAY and FRIDAY warm and humid, outbreaks of thundery rain, some warm sun at times, lows near 15 C, highs near 23 C.

    Somewhat cooler by weekend of 9th-10th but still fairly warm and some pleasant sunny spells along with more scattered showers. There are no really strong signals of a complete breakdown of this warm spell yet. Travelling to eastern England or France? Expect hot temperatures especially during the work week ahead, highs could reach 30-33 C in places.

    My local weather on Friday was sunny and warm with a high of 25 C.

    Strong auroral activity is expected in various regions for several days as large solar flares have taken place. Today is the anniversary of the "Carrington event" of 1859, a solar storm that, if it occurred in today's technological environment, could cause enormous damage. In 1859 it managed to send strong electrical currents through telegraph lines and operators could send messages without generating the usual necessary electrical power (if they still had usable equipment). A repeat of the Carrington event now could quite possibly create a huge international crisis as it would "fry" a lot of our power grids and infra-structure.

    (a picture of Debbie Downer might be appropriate here) ... as they say, go with the flow.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Sunday, 3 September, 2023 ___ Forecasts for Ireland

    TRENDS will be warm (3 to 5 deg above normal) and dry (rainfall 10 to 25 per cent of normal) with sunshine above average by 25 to 50 per cent. Winds generally light southeast, variable at times, and calm at night with extensive fog.

    FORECASTS

    TODAY any morning fog or mist will give way to hazy sunshine, warm with highs 20 to 23 C. Some lingering mist in a few coastal areas. Winds light and variable may give rise to local sea breezes.

    TONIGHT will be clear to about midnight and then low cloud and fog patches will become widespread, lows 8 to 11 C. Around 11 p.m. to midnight you may be able to see the moon and bright Jupiter rising together in the east.

    MONDAY another misty or foggy morning, with spells of hazy sunshine later, quite warm, lows near 10 C and highs 21 to 25 C.

    TUESDAY some fog patches, hazy sunshine following, very warm. Lows near 12 C, highs near 25 C inland, 19 to 23 C coastal areas. Isolated showers or thunderstorms in west Munster.

    WEDNESDAY variable cloud, warm, thundery showers by afternoon in a few locations, lows near 14 C, highs near 24 C.

    THURSDAY and FRIDAY warm and humid, outbreaks of thundery rain, more widespread on Thursday than Friday, and still some warm sun at times, lows near 15 C, highs near 23 C.

    Some time during the weekend of 9th-10th September, a cold front will arrive with stronger southwest to west winds developing, and possibly a brief interval of rain, but temperatures will remain quite warm in the low to mid 20s. The following week will see another high pressure area building up, perhaps not quite as warm as this week, but near or above normal at 19 to 22 C, clear skies at night probably quite foggy as temperatures drop to lower values around 5 to 8 C.

    My local weather on Saturday was sunny and pleasantly warm at 27 C, currently clear and around 14 C with a great view of the moon and Jupiter.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Monday, 4 September, 2023 ___ Forecasts for Ireland

    TRENDS will be warm (3 to 5 deg above normal) and dry (rainfall 10 to 25 per cent of normal) with sunshine above average by 25 to 50 per cent. Winds generally light southeast, variable at times, and calm at night with extensive fog.

    FORECASTS

    TODAY mist or fog in some locations for a while this morning, giving way to hazy sunshine, very warm with highs 21 to 25 C. Only slight cooling from sea breezes but some mist or low cloud possible on outer coastal fringes.

    TONIGHT clear at first, then some fog and mist after midnight. Lows 10 to 13 C.

    TUESDAY some fog patches, hazy sunshine following, very warm with highs near 25 C inland, 19 to 23 C coastal areas. Isolated showers or thunderstorms in west Munster tracking towards northwest.

    WEDNESDAY variable cloud, warm, thundery showers by afternoon in a few locations, lows near 14 C, highs near 24 C.

    THURSDAY and FRIDAY warm and humid, partly cloudy with a few outbreaks of thundery rain, more widespread on Thursday than Friday, and still some warm sunshine at times, lows near 15 C, highs near 23 C.

    SATURDAY morning fog leading to hazy sunshine, warm. Lows near 13 C and highs near 23 C.

    SUNDAY-MONDAY a weak front will skim across northern counties, leading to more cloud and a few showers there. Little or no change to the warm spell further south, so temperatures on these days will range from near 18 C north to 23 C south. As high pressure builds back in from the west, a continuation of the warm, dry and (at night) sometimes foggy spell will last well into mid-September. Any changes may be rather subtle and could involve the building in from north or east of reinforced high pressure, which could lead to somewhat colder nights and/or denser fog which is often the case as September nights lengthen.

    As warm as this may sound, eastern England will be in for mid-summer heat reaching 31 or 32 C by mid-week. I think one or two locations in Ireland could possibly reach 27 C as very warm air is spreading in aloft here also.

    My local weather on Sunday was cloudy with a few sunny breaks, and distant showers off to our south but no rain recorded here yet. The high was around 23 C.



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  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Tuesday, 5 September, 2023 ___ Forecasts for Ireland

    TRENDS will be warm (3 to 5 deg above normal) and dry (rainfall 10 to 25 per cent of normal) with sunshine above average by 25 to 50 per cent. Winds generally light southeast, variable at times, except near south coast where some intervals of moderate east to southeast breezes likely, and otherwise generally calm at night with extensive fog or mist.

    FORECASTS

    TUESDAY some fog patches at first, with hazy sunshine following, very warm with highs 24 to 27 C inland, 19 to 23 C coastal areas. Isolated showers or thunderstorms in west Munster tracking towards northwest, mostly confined to Kerry.

    TONIGHT clear at first, then some fog and mist after midnight, quite warm, lows 12 to 16 C.

    WEDNESDAY variable cloud, warm, thundery showers by afternoon in a few locations, highs near 24 C.

    THURSDAY warm and humid, partly cloudy with a few outbreaks of thundery rain, and still some warm sunshine at times, lows near 15 C, highs near 23 C.

    FRIDAY little change and probably fewer showers although rather cloudy, warm, lows near 15 C and highs near 24 C.

    SATURDAY morning fog leading to hazy sunshine, warm. Lows near 13 C and highs near 24 C.

    SUNDAY occasional rain may develop, highs near 20 C.

    It may start to return to more normal September weather during the following week but guidance is not that reliable for the actual evolution of this warm spell.

    My local weather on Monday was mostly cloudy with a few passing showers, and highs near 20 C. It was very hot in parts of the eastern U.S., Washington DC airports hit 37 C. The heat extends from northern New Jersey west into the plains states and south into Texas. It was unseasonably cool in parts of the western U.S., with significant rainfalls.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Wednesday, 6 September, 2023 ___ Forecasts for Ireland

    TRENDS will be generally warm and dry to around Sunday with just scattered thundery showers, becoming more widespread after Sunday and perhaps amounting to near normal rainfalls in some areas although with potential for spot flooding around Monday-Tuesday as slow moving fronts finally put an end to the warm spell. Sunshine throughout will be variable due to small-scale disturbances leading to quite variable amounts of sunshine but on the whole, expect near normal totals. 

    FORECASTS

    TODAY will be very warm with hazy sunshine in many areas, isolated thunderstorms possible over inland western counties. Highs 23 to 26 C. 

    TONIGHT muggy and quite warm with fog developing after midnight in some areas, lows 14 to 18 C. 

    THURSDAY more showers and thunderstorms, possibly more towards the east coast from a weak disturbance moving north through the Irish Sea, but still some hazy sun and warm temperatures likely, highs 23 to 26 C. 

    FRIDAY and SATURDAY will continue hazy, very warm, and there may be fewer showers around, lows 14 to 18 C and highs 22 to 25 C. 

    SUNDAY partly cloudy to overcast, warm, humid, scattered thundery showers could become heavy in some areas (inland south is favoured). Lows 15 to 19 C and highs 21 to 24 C. 

    By MONDAY-TUESDAY there may be more organized frontal rainfalls and these could be quite heavy in some areas. Lows near 14 C and highs 17 to 20 C. 

    Later next week there may be a brief dry interval again with high pressure trying to rebuild, but latest guidance suggests this may be quite transitory and further Atlantic lows are likely to begin to dominate the weather. I think it's fair to say the models are struggling to get a grip on developments past five days and any forecast suggestions are probably quite speculative. 

    My local weather on Tuesday was partly cloudy and pleasant with a high near 24 C. Severe heat continued in eastern regions with more records set in the central plains to mid Atlantic coast of the U.S.

    I will soon be taking off on a long-overdue vacation (to the usual destination, southwestern deserts) and at some point soon you may find some guest forecasters here, be kind. 

    Post edited by M.T. Cranium on


  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Thursday, 7 September, 2023 __ Forecasts for Ireland

    TRENDS remain similar to last report, temperatures well above normal to Sunday, then closer to average, rainfalls becoming more widespread by Sunday into Monday, some further sunny intervals becoming less frequent after Saturday.

    FORECASTS

    TODAY will be very warm and quite humid with a few showers or thunderstorms developing across the southeast by late morning, spreading up the coast and possibly further inland, into the Dublin region by afternoon. Elsewhere, partly cloudy to sunny and very warm, highs generally 24 to 28 C, variable winds.

    TONIGHT will be clear with some fog or mist towards morning, warm with lows 14 to 18 C.

    FRIDAY will be hazy, very warm and rather humid, with just isolated showers, most places dry; highs 24 to 28 C.

    SATURDAY partly cloudy, warm, humid, a few showers or isolated thunderstorms. Lows 14 to 18 C, highs 22 to 26 C.

    SUNDAY mostly cloudy, showers and thunderstorms, some heavy downpours possible, lows 15 to 19 C and highs 19 to 22 C.

    MONDAY variable cloud to overcast, outbreaks of rain and cooler, lows 10 to 13 C and highs 17 to 20 C.

    TUESDAY and WEDNESDAY will see a few dry intervals but further outbreaks of rain are also likely, becoming heavy at times towards late Wednesday, and temperatures will be fairly close to average, lows 7 to 10 C and highs 16 to 19 C.

    Eventually, guidance shows an even cooler interval around a week to ten days from now, but that could be followed by a brief return to quite warm weather. A wild card in the scenario is the future evolution of hurricane Lee and another possible storm following on behind Lee, not yet formed but under watch now near Islas Cabo Verde. Lee is likely to be a major hurricane by the weekend and will move close to Bermuda then up towards Nova Scotia and Newfoundland. We can recall that Franklin was supposed to be somewhere in the arctic by now but is its remnants are in fact not that far away from southwest Ireland although unlikely to approach, so this reminds us that long-range forecasting of tropical systems is hit or miss at best. These two hurricanes (assuming the second one develops) could play some role in how the weather patterns evolve after mid-September in Ireland.

    My local weather on Wednesday was sunny with a few clouds, with a high of 24 C. The heat wave continued in eastern U.S. states, Richmond VA hit 38 C and New York City tied an earlier seasonal high of 34C, which is not very impressive for the location but unusually late in the season for an annual maximum. Baltimore MD also had their high for the year at 38 C.

    Not sure if I'm going to post again one more time before going off on holiday, if not, see you all after a couple of weeks.



  • Registered Users Posts: 14,324 ✭✭✭✭M.T. Cranium


    Friday, 8 September, 2023 ___ Forecasts for Ireland

    TRENDS ... Very warm to Sunday night, possibly part of Monday in south, then cooling to near normal values. Rainfalls near average but mostly confined to Sunday-Monday and possibly next Thursday. Sunshine probably running a bit below average overall.

    FORECASTS

    TODAY will be partly cloudy to sunny, hazy and humid, with a few isolated showers or thunderstorms mostly inland west; highs 24 to 28 C.

    TONIGHT will be partly cloudy to overcast with some fog or mist towards morning, warm with lows 14 to 18 C.

    SATURDAY partly cloudy, warm, humid, a few showers or isolated thunderstorms. Lows 14 to 18 C, highs 22 to 26 C.

    SUNDAY mostly cloudy, showers and thunderstorms, some heavy downpours possible, lows 15 to 19 C and highs 19 to 22 C.

    MONDAY variable cloud to overcast, outbreaks of rain more persistent in west and north and cooler, lows 10 to 13 C and highs 17 to 20 C.

    TUESDAY partly cloudy to sunny, lows 7 to 9 C and highs near 18 C.

    WEDNESDAY increasing cloud, rain by afternoon or evening, lows near 7 C and highs 18 to 20 C.

    THURSDAY intervals of rain or passing showers, rather windy, lows near 10 C and highs 15 to 18 C.

    FRIDAY (15th) cool and breezy, passing showers, some with hail, lows near 6 C and highs 11 to 14 C.

    This cooler interval may persist through a good part of weekend 16th-17th with further rain at times, then a more variable and possibly stormy interval is likely around the equinox.

    My local weather was sunny with a high of 24 C. In the tropical Atlantic, Lee has rapidly intensified to a cat-5 hurricane east of Antigua and it should continue on a west-north-west track safely out to sea relative to the Virgin Islands, could make a dangerous approach to Bermuda in a few days and then a landfall in eastern Canada in about a week from now. Margot has formed west of the Islas Cabo Verde and is a disorganized tropical storm at present, could become a less severe hurricane west of the Azores about the time Lee is approaching Bermuda, and circle around for a run at western Europe. Stay tuned for that potential as well as the possibility that the models will change course for Lee, not too sure about that possibility. This time my planned absence is a sure thing for a while, I posted this outlook as I wasn't sure about available forecast alternatives, but the word has gone out, sure someone will post, so take care and enjoy what remains of the late summer spell.



  • Registered Users Posts: 13,505 ✭✭✭✭sryanbruen


    Saturday, 9 September, 2023 ___ Forecasts for Ireland

    As M.T. takes his well deserved break, I will fill in for him providing service as usual.

    TRENDS

    After a dry September so far, the coming week will likely prove significantly wetter with pressure weakening and the airflow returns from the Atlantic. At first some thunderstorms possible through the weekend but becoming more general rain through the week as it gets cooler too. Expect some will have twice their weekly rainfall depending on how slow-moving these fronts are. The jet stream looks to be slightly southerly tracking meaning the far northwest and north are likely to be driest.

    Following an exceptionally warm week, further warmth through today and to some extent Sunday too, temperatures will return to more typical values for September in the mid-teens. No sign of anything cool on the horizon however.

    Sunshine likely to be average to below average after again a very sunny week. Some sunnier days such as Tuesday.

    FORECASTS

    TODAY will bring variable cloud cover and sunny spells. Some patchy rain and drizzle to start in the west. Risk of scattered showers becoming organised into thunderstorms through the afternoon. As always with thunderstorms, it's a case of wait and see. Very moisture laden airmass today provides the threat of some heavy downpours. The eastern half of the country looks to be in the highest possible threat. A warm day with afternoon highs of 20-26C but cooler than recent days as winds veer southwesterly.

    TONIGHT ... the threat of thunderstorms continues well into tonight with another mild and humid night in store as temperatures set to not fall below 14-17C. Light winds will allow mist and fog to develop once again.

    SUNDAY ... One final rather warm day with afternoon maxima of 23 or 24C still possible locally if the sun shines but a further threat of heavy downpours and thunderstorms. More cloudy generally than most of the past week.

    MONDAY ... rain will push southeastward from the northwest clearing here by the evening with the humid air finally clearing the country introducing a fresher feed from the North Atlantic. Much cooler with maximum temps of 16-19C.

    TUESDAY ... mostly dry with sunny spells and a few scattered showers in a light northerly wind. Will feel noticeably cooler than of late but values more typical of mid-September in the 14-18C range.

    WEDNESDAY ... a weak ridge gives a dry start to the day and cooler night than of late with morning mins getting down to possibly 7 or 8C. Cloud will quickly increase as rain spreads in from the west through the day arriving by nightfall. Freshening southerly winds with maximum temps of 14-18C.

    LATER IN THE WEEK ... whilst details will be hazy at this point, it looks very unsettled to end the week with further bands of rain likely and showery interludes inbetween. Possibility of more deep low pressure coming up to the equinox but tropical storm/hurricanes always provide the threat of shaking up the pattern. This creates uncertainty in the forecast and September always has the highest uncertainty of any month. The recent warm spell likely wouldn't have happened without Hurricane Franklin amplifying high pressure northward for example.



  • Registered Users Posts: 13,505 ✭✭✭✭sryanbruen


    Sunday, 10 September, 2023 ___ Forecasts for Ireland

    TRENDS

    Remain much the same as per the post yesterday with a much wetter week in store as an Atlantic flow returns with mainly average temperatures for the time of year which will feel chilly in comparison to the recent exceptional warm weather.

    TODAY ... Mist and fog clearing with variable cloud cover. The high humidity is likely to spark off heavy downpours and possibly thunderstorms. They could occur anywhere due to the sporadic nature. More general cloud cover approaching the northwest later in the day ahead of rain into tomorrow. One more final rather warm day with afternoon high of 20-24C in any sunshine. Winds light in nature.

    TONIGHT ... Drying out as showers and thunderstorms dissipate but rain will approach the northwest and slowly push southeastward. Mild night with lowest values getting down to 13-15C as winds continue to be light.

    MONDAY ... Rain clearing southeastward will give a cloudy and cooler day. Afternoon values more average for the time of year in the 16-18C range typically but could still reach 19 or 20C in the south for a time. The rain will clear the northwest by late evening.

    TUESDAY ... A fresh day with sunny spells and winds from a northerly direction. Will feel distinctly cold by comparison to recent. Only scattered showers in nature. Highest values of only 15-18C. Tuesday night looks like being more clear now which will allow the temperature to drop further getting down to possibly 4 or 5C in the Midlands. Been a long time since had a night as cool as that.

    WEDNESDAY ... Southerly winds freshening through Wednesday after a dry start as Atlantic fronts approach and spreading rain in from the west through the afternoon. Afternoon highs of only 14-18C.

    THURSDAY ... Rain will clear during the morning but could be succeeded by further rain into the south whilst most places will be mainly dry with only isolated showers possible. Winds calming down from the west with afternoon highs up to 18 or 19C in any sunshine but only 14 or 15C in the north.

    The weekend at the moment continues to look very unsettled but some important differences. The rain that could approach the south on Thursday is a long trailing weather front that could bring a very wet spell if it reaches Ireland and could stick around for a few days. However, not all models show this and some others show the band being further south and weaker. Some pretty deep low pressure still looking possible coming up to the autumn equinox. On the whole, not much sign of the weather settling back down but any tropical cyclone could come and shake it up. The effects of Franklin I was describing yesterday weren't even showing on model output as recent as the final week of August.



  • Registered Users Posts: 13,505 ✭✭✭✭sryanbruen


    Monday, 11 September, 2023 ___ Forecasts for Ireland

    TRENDS

    Latest guidance not previously as wet for many but still very much wetter than average across the country expected with a particular focus on the southern half of the country due to a slight southerly track of the jet stream. Around average temperatures by day, tonight and tomorrow night rather cool in places under clearer skies and northerly winds. Sunshine near average for the time of year.

    TODAY ... Weakening band of rain and drizzle will push southeastward through the day giving a cloudy day for many but will clear the northwest during the evening where sunny spells will develop here. Cooler than of late with winds veering northwesterly in direction and afternoon highs of 16-19C which are only average for the time of year.

    TONIGHT ... The last of the rain set to clear with clear spells occurring for most. Fog and mist patches possible under light northerly winds. A much colder night than of late with minimum temps possibly as low as 5C but more generally in the upper single figures or touching low double digits where cloud stays longer.

    TUESDAY ... Good sunny spells but feeling very fresh and cool in comparison to recent with northerly winds. Small risk of showers in the north. Afternoon values of 15-18C. A cool night in store getting down to as low as 4 or 5C in the Midlands under clear skies and possibly slack conditions leading to mist or fog.

    WEDNESDAY ... Southerly winds increasing in strength through Wednesday after a dry and cool start as Atlantic fronts approach and spreading rain in from the west through the afternoon. Daytime temps of 14-18C. The rain will clear the west overnight and winds will veer back west bringing in scattered showers.

    THURSDAY ... As the rain clears, sunny spells developing and a few showers for the north and northwest. Bit more of a breeze around particularly in the north. The rain that previously looked to affect the south looks to hold off and all of Ireland will stay mostly dry. Maximum temps around 15-18C.

    FRIDAY ... Has some question marks about the rain to the south of the country that looked to have been previously forecast on Thursday. A little weather front could either bring rain to the south and southeast of the country or it will stay offshore closer to England and give another mainly dry day with sunny spells for Ireland and similar temperatures to prior days in the mid-teens.

    The weekend continues to look uncertain at the moment between the models. One shows a very unsettled weekend with any high pressure being to our north as the rain to the south on Friday sticks around and gets blocked over us from moving much. This would give a lot of wet weather to the south and east. Another model shows the high pressure giving a mainly dry weekend for most which would give good sunny spells and probably chilly, misty mornings. Watch this space.



  • Registered Users Posts: 13,505 ✭✭✭✭sryanbruen


    Tuesday, 12 September, 2023 ___ Forecasts for Ireland

    TRENDS

    Continues to look rather unsettled with an Atlantic flow. Highest rainfall totals likely across the south due to stalled weather fronts later in the week where there continues to be uncertainty surrounding their position.

    Average temperatures for the time of year. The stalled weather front later in the week could bring some warmth back to England but Ireland is expected to be on the northern side of the front so unlikely to see a significant rise in temperature here. Further average temperatures most probable.

    Sunshine rather average for the time of year with sunnier moments inbetween fronts, today being one of those.

    TODAY ... The last of the cloud and drizzle clearing this morning from the east to leave a mainly dry, sunny day but feeling distinctly chilly than of late. Can't rule out the odd isolated shower. Afternoon values typically only 15 or 16C, 17/18C in the Midlands and east possible with winds from a northwest or northerly direction.

    TONIGHT ... Winds falling light will bring the risk of mist and fog but mostly clear skies and a cold night in store. Temperatures falling down to as low as 4C.

    WEDNESDAY ... Starting off bright in the east but will quickly be replaced by cloud approaching from the west through the morning. Rain will push in from the west by the afternoon whilst it will probably be dry for the east for most of the day. Freshening southerly winds with afternoon highs of 14-17C.

    THURSDAY ... Winds calming down as the rain clears most of the country leaving a dry day with sunny spells. A bit warmer possibly with high teens and maybe touching 20C in the sunshine. The risk has returned however that rain may hold on in the southeast and then push back northward later in the day across the south and east of Ireland.

    FRIDAY ... Latest guidance shows widespread rain across the south and east through Friday giving a cloudy and wet day. This will be dependent on where exactly the weather front lies. The north is likely to have a dry day with sunny spells currently. Highest temps only 14 or 15C under the cloud and rain whilst getting up to 16-17C elsewhere. Winds veering back northeast.

    WEEKEND ... High pressure looks like staying to our north meaning it will be a rather showery day on Saturday, particularly in the east closest to the area of low pressure. After a dry start, Sunday is likely to see rain spread in from the Atlantic.

    Autumn continues to look like being unleashed as we approach the equinox next week with deepening areas of low pressure bringing further bands of rain from time to time and blustery westerly winds.



  • Registered Users Posts: 13,505 ✭✭✭✭sryanbruen


    Wednesday, 13 September, 2023 ___ Forecasts for Ireland

    TRENDS

    Significantly above average rainfall in a wet week ahead, especially for the south and east due to a succession of trailing weather fronts at the end of the week.

    Average temperatures for the time of year, verging on the cool side under clearer skies at night and days where rain is persistent.

    Sunshine average for the time of year.

    Little change overall.

    TODAY ... Mist and fog clearing to give a dry start to the day with hazy sunny spells but will quickly be replaced by rain approaching from the Atlantic. Winds freshening from a southerly direction at the same time with afternoon highs of 14-17C.

    TONIGHT ... Rain will attempt to clear and drying out but winds calming down will increase the chance of mist and fog. Milder night likely in the low double digits.

    THURSDAY ... A rather dry start with variable cloud cover and sunny spells. However, the latest guidance suggests rain will indeed push up from the south later on in the day with the north staying dry for longest. Afternoon highs of 15-19C.

    FRIDAY ... Maybe 2 days away but there continues to be uncertainty surrounding the exact position of the trailing weather front which is likely to bring a very wet day for some. Currently Munster, Leinster and east Ulster are at highest risk of getting affected by this with the rain clearing from west Ulster and Connacht by the afternoon. This may change, don't take it as gospel. Some very warm air is expected to filter into England with over a 15 degree difference in temperature between the cool air to the north of Scotland and the warm air over southern England. Where the two air masses meet lies the weather front causing troubles in the forecast and possibly some very heavy rain for the south and east of Ireland. Temperatures will struggle to rise above the low teens in the persistent rain.

    WEEKEND ... Remains much the same as prior with Saturday likely to be a showery day and showers most frequent in the east of the country followed by a wet Sunday with rain spreading into the country.

    Weather looking decidedly autumnal next week with several deep areas of low pressure developing in the North Atlantic and the jet stream bringing them straight towards Ireland.



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  • Registered Users Posts: 13,505 ✭✭✭✭sryanbruen


    Thursday, 14 September, 2023 ___ Forecasts for Ireland

    TRENDS

    Remain the same as prior with average sunshine and temperatures expected in a wet week ahead, very wet for some with a particular wet episode coming up tonight into tomorrow Friday via a slow-moving weather front.

    TODAY ... A dry and bright start will be followed by increasing cloud as rain approaches from the south spreading northwards through the evening. This rain will be very heavy with Cork at a moderate threat of flooding starting tonight. Orange warning for rain here is valid from 6pm this evening to 6pm tomorrow evening whilst a yellow rain is in effect for other parts of Munster and much of Leinster. Possibly as much as 70mm falling in the southeast by dawn on Saturday. Staying dry in the north and northwest for much of the day with afternoon highs of 15-18C, lowest values in the south.

    TONIGHT ... Heavy rain will continue to impact nationwide overnight though and remain persistent, especially in the south and east. Again the risk of flooding continues. Minimum temps around 10C.

    FRIDAY ... A very wet day in store with heavy rain set to continue again lingering around for much of the day. Further threats of flooding, including outside of Cork. Waterford, Kilkenny and Carlow look vulnerable to highest totals by the end of the day on the latest guidance. Cool for the time of year beneath the persistent heavy rain with maximum temps of only 12C. Sunnier spells might occur in the northwest as rain tries to clear but even here, temps up to only 14 or 15C likely. Note the poor visibility if you're driving.

    SATURDAY ... Rain might continue in the east for a time due to slow-moving weather front but a day of sunny spells and possibly scattered showers with temperatures back to norm for the time of year in the mid-teens.

    SUNDAY ... Showers will merge into longer spells of rain bringing a cloudy, rather wet day. The east is likely to be most affected. Afternoon highs of 16-18C as winds veer easterly.

    A zonal flow will bring further bouts of rain and increasingly stronger winds through next week as autumn shows its hand nearing the equinox. Looking further afoot, there's little chance of settling back down again.



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