Thursday, 30 September, 2010
ALERT for possible heavy rainfalls in total later today and especially tonight, with 25-40 mms possible by mid-day Friday in two waves as described below in the forecast. Spot flooding is possible and tonight, driving conditions will be poor due to fog as well as water accumulations on roadways.
TODAY ... rain will work its way across Ireland from west to east this morning and may be heavy at times with 10-15 mms on average ... then it may brighten for a while this afternoon before heavier rain arrives late in the day in the west. Winds will increase to SSW 20-40 mph. ... rather warm and humid with highs reaching 18 C.
TONIGHT ... rain, heavy at times (15-25 mms) with some embedded thunder ... winds continuing SSW 20-40 mph ... foggy with lows 12-14 C.
FRIDAY ... morning showers becoming confined to east by mid-day with some brighter intervals developing, winds veering to WSW 20-40 mph (and some higher gusts mid-day) with more showers developing in the westerly air flow ... highs 17-19 C.
SATURDAY ... partly to mostly cloudy, fog at times especially over higher ground, frequent showers, moderate S to SW winds, lows near 12 C and highs near 16 C. Rainfalls about 10 mms.
SUNDAY ... variable cloud, showers, some longer periods of rain developing mainly in the south, winds backing around to SE but not overly strong (it would seem at this stage) with low pressure tracking to the south taking more rain and wind into the U.K. and northern France (so while it won't be that great in Ireland, the weather is likely to be considerably more adverse in places like south Wales where they will be trying to finish up the Ryder Cup).
For Ireland, expect 5-10 mms of rain and lows near 10 C, highs near 15 C.
If you're interested, the weekend rainfalls could be 20-50 mms in parts of the U.K.
NEXT WEEK is still looking quite unsettled. The disturbance that was briefly Nicole off Florida today should be rounding the turn near Newfoundland on Sunday and heading for Ireland around Tuesday. That may turn out to be a strong wind and rainfall event as it hits the jet stream at full speed. Expect that around Tuesday night so mid-week may be particularly unsettled. Temperatures will stay above normal especially at night.
We had a very pleasant sunny day here on Wednesday (highs near 21 C) as the storm track has shifted far enough north to keep the rain in central B.C. now. It remains very hot in southern California. The east coast was warmer than average too but rain has spread up as far north as Philly now and while Nicole came and went, a strong low is forming off Florida that could bring five inches of rain to the Carolinas today and tomorrow.
Would suggest you check with the active thunderstorm potential thread for some other perspectives on today and tonight's active weather, and I will try to issue updates if awake.