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Charts ( Up to T120 ) Winter 2024/2025 ** READ MOD NOTE IN FIRST POST**

  • 01-12-2024 01:32AM
    #1
    Moderators, Science, Health & Environment Moderators Posts: 17,415 Mod ✭✭✭✭


    Mod Note:

    This thread is for posting/discussing/analyzing CHARTS in the shorter range timeframe up to T120 hours (next 5 days) for Winter 2024/2025.

    If your post does not specifically relate to a chart then it doesn't belong here - Off topic posts will be moved

    Thank you.

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    Winter is here, on Monday turning cooler with a brief northerly making it feel rather chilly.

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    Northerly gets out of the way by Tuesday. Still feeling fairly chilly on Tuesday but milder weather is on the way from Wednesday.

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    Low pressure moves in late Wednesday/Thursday which could bring some fairly windy weather at times and rain.

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    The coming 5/6 days won't be overly wet with a greater chance of heavier rain after mid week.

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    Thursday could be a fairly windy day so this may have to be watched.

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    Post edited by Gonzo on


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Comments

  • Registered Users, Registered Users 2 Posts: 2,839 ✭✭✭.Donegal.


    GFS small dusting late Friday in to the small hours of Saturday

    image.png

    ECM also has a wintry mix to the north

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  • Registered Users, Registered Users 2 Posts: 651 ✭✭✭Robwindstorm


    Keep an eye on that system for Saturday guys. Has the potential to develop into a storm. Track and intensity are still up for grabs



  • Registered Users, Registered Users 2 Posts: 2,839 ✭✭✭.Donegal.


    Latest from GFS, midlands/N midlands favoured spot to see a dusting Friday late afternoon/early evening. One to watch, nothing major on the cards on this run, perhaps 1-3cm for sweet spots or just confined to high ground/rainy/sleet mess. Track not nailed down either regarding where is best placed to see some wintriness.

    image.png


  • Registered Users, Registered Users 2 Posts: 2,839 ✭✭✭.Donegal.


    This afternoons gfs run dropped the snow risk and the pub run has it back but for the NW. The ecm has dropped the wintry mix and has the system further south with the northern half of the country largely staying dry. It’s hard to have any confidence as to what will happen.

    image.png image.gif


  • Registered Users, Registered Users 2 Posts: 518 ✭✭✭Donegal Ken


    Friday night into Saturday really does need to be watched closely. The UKMO at the moment is the most concerning run with strong winds across much of the country with extremely severe winds across the northwest and west of the country.

    Could be multiple different impacts from this system from severe winds, heavy rainfall, Flooding and possible snowfall for some northwestern and northern areas also.

    GFS, UKMO, ICON, ECMWF & GEM now have the strong system on a similar track. ARPEGE & HARMONIE differ but will be interesting to see if they follow tomorrow morning. I think if the Harmonie follows we will see this been named tomorrow with early warnings and potential weather advisory issued.

    xx_model-en-324-0_modgbr_2024120412_63_949_254.png xx_model-en-324-0_modgbr_2024120412_66_949_254.png


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  • Moderators, Science, Health & Environment Moderators Posts: 12,669 Mod ✭✭✭✭Meteorite58




  • Registered Users, Registered Users 2 Posts: 518 ✭✭✭Donegal Ken


    Great job most definitely needed after this evenings runs.



  • Moderators, Science, Health & Environment Moderators Posts: 12,669 Mod ✭✭✭✭Meteorite58


    Windy on the coasts tomorrow and breezy to blustery overland, especially in the increasing convective showers tomorrow evening, through the night into Sunday across the country. Becoming increasingly wintry tomorrow evening into Sun with rain , sleet, hail and snow in places. Under showers visibility could be quite poor in the strong winds at times giving localized blizzard like conditions if somewhat short lived . Any accumulations of snow melting away in the showers and daylight from early on Sunday. Winds getting stronger on coasts tomorrow evening especially along the western side of the country, possibly getting up to somewhere around100 km/h along the coastal fringes, AROME showing the possibility of very heavy squally showers crossing the country with locally very strong winds especially overnight Sat into Sun morning, potentially getting localized gusts up to 80-100 kmh under an intense convective shower ( could get a few reports of unusually localized very strong winds from a WNW / NW direction, hope no damage to the power grid, AROME is good at picking up those squally shower set ups). Increasing instability around the coasts in the unstable cold vigorous NW'ly airflow raising the chance of some thunderstorms around the coasts especially the W, NW and N. The 528dam line moves down over much of the country for a time before a return to milder temperatures.

    FSXX00T_48.gif ecmwf_mslp_wind_eu_17.png

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  • Moderators, Science, Health & Environment Moderators Posts: 12,669 Mod ✭✭✭✭Meteorite58


    Huge change in the charts from yesterday regarding the stormy weather that was showing up around the 1st , huge jet upstairs probably giving big adjustments to the charts at this stage, could get watered down or could appear very strong again. Will see. ECM the strongest system at this stage and pulling in the cold air behind it. Some models showing it to be very wet also along with the wind.

    modez_20250101_1500_animation (1).gif modez_20250101_1500_animation.gif

    modusa_20250101_1500_animation.gif

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  • Registered Users, Registered Users 2 Posts: 333 ✭✭ascophyllum


    Screenshot_20241228_105732_Chrome.jpg Screenshot_20241228_105827_Chrome.jpg

    GfS and ECM have upped the wind potential for that storm and have the center of the low around Donegal, other models showing a shortwave going further south.



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  • Moderators, Science, Health & Environment Moderators Posts: 1,556 Mod ✭✭✭✭WolfeEire
    Clare (430ft asl)


    NAVGEM (1).png

    A low pressure system is set to impact our weather on New Year's Day with a divergence in the main models regarding its exact track. The UKMO, ECM and UKMO centre the system off the Mayo coast while the other models have a slacker 'slider low' tracking across the south of Ireland. Plenty to resolve over the next few days.

    www.weatheire.com



  • Registered Users, Registered Users 2 Posts: 2,243 ✭✭✭squarecircles


    So its either a severe storm, or disruptive snow or a bland watered down version of both, yeah we all know which one it will be.



  • Registered Users, Registered Users 2 Posts: 1,705 ✭✭✭Billcarson


    Maybe we will hit the jackpot and it will be a severe snow storm/ blizzard. Well I can dream......and it will go down in folklore as the great new yrs day blizzard of 2025 lol



  • Moderators, Science, Health & Environment Moderators Posts: 12,669 Mod ✭✭✭✭Meteorite58


    Different tracks on New Years Day but the main models showing a potentially strong wind event and possibly stormy in parts with different outcomes regarding snow potential depending on the position of the system, very steep temperature gradient as can be seen from chart below.

    All the models showing a sudden introduction of much colder air pulled in behind the storm possibly for a number of days at least so bad time to be without electricity if it is disruptive.

    A lot of precipitation showing up on the charts but a wide spread in location depending on track but looks to be a wet or very wet system having a warm core, ICON leads the way showing a track further south giving a huge dump of snow further North. GFS was showing this but dropped it, would expect these sort of charts to fluctuate over the coming days, too far out to know for certain but it is a scenario that could play out with all the moving parts aligned.

    Weds could be very mild up around 12 to 14C for a time but end up with frosts later Thurs morning and much colder days to follow.

    Highest tides next Weds and Thurs with some massive seas being predicted.

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  • Registered Users, Registered Users 2 Posts: 518 ✭✭✭Donegal Ken


    There is alot of focus on the new year period at the moment with the risk of a disruptive storm. Another thing that is been overlooked at the moment is the risk of very heavy rainfall and flooding in the northwest and west during the 30th into the 31st. Donegal really sticks out with some models showing Donegal well into a high orange warnings with 50mm to 60mm possible and around 90mm possible over nearly a 48 hour period. Should see a warnings for rainfall on Sunday for Monday and Tuesday with the high potential of Donegal going orange.

    xx_model-en-324-0_modfra_2024122800_84_949_157.png xx_model-en-324-0_modez_2024122800_78_4863_63.png xx_model-en-324-0_modfra_2024122806_72_4863_63.png xx_model-en-324-0_modhardmi_2024122809_60_4863_63.png


  • Registered Users, Registered Users 2 Posts: 2,839 ✭✭✭.Donegal.


    Storm. Snow for the north. Will be a couple of days before this is can be forecast with any certainty

    image.png image.png


  • Registered Users, Registered Users 2 Posts: 283 ✭✭Mount Vesuvius


    If today's 12z GEM comes off, it's shovelling white for many,

    If the low slides under fairly slack then we might be good for it but alot to go wrong yet.

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  • Moderators, Science, Health & Environment Moderators Posts: 17,415 Mod ✭✭✭✭Gonzo


    If todays GFS 12z verified we would be extremely cold, but daytime temperatures like this is highly unlikely, has to be a very cold outlier.

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    GEM 12z alarmingly similar to the GFS 12z.

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    that's proper entrenched cold over snow fields, so a huge dumpload of salt and health warnings with this. I expect the 18z to sober things up but we shall see.



  • Registered Users, Registered Users 2 Posts: 1,744 ✭✭✭typhoony


    Flash flooding is an issue however water levels on rivers and lakes have been dropping so there won't be any widespread flooding



  • Registered Users, Registered Users 2 Posts: 2,839 ✭✭✭.Donegal.


    ECM Wednesday keeps snow confined to Ulster especially west ulster, briefly turns to rain except perhaps for the extreme north, before it wraps around and turns back to snow across Ulster. 10cm plus of snow for Donegal from what I can make out on wxcharts but that’ll change 50 times before Wednesday no doubt. It is a touch further south that previous run though. Stormy conditions as well.

    Snow remains out to day 10 across most of Ulster. Some snow showers for N Connacht by day 7 with some accumulation there.

    Post edited by .Donegal. on


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  • Registered Users, Registered Users 2 Posts: 283 ✭✭Mount Vesuvius


    This 06z ECM model is new, interesting. Keeps that low very slack. Probably crap model but worth keeping an eye.

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  • Registered Users, Registered Users 2 Posts: 2,140 ✭✭✭adocholiday


    It's the new AI/machine learning powered model from ECM. It's using the Pytorch machine learning framework to analyze old charts from 1979 onwards and then using that data to make forecasts today. I haven't actually been comparing it to see how it's performing against the actual weather though, but I might actually do that for a few months this year just to see.



  • Moderators, Science, Health & Environment Moderators Posts: 1,556 Mod ✭✭✭✭WolfeEire
    Clare (430ft asl)


    Backed up by a negative NAO/AO, Ireland and Britain are likely to experience a relatively long period of colder than average conditions according to the GFS. RE: New Year's Day snowfall, there is considerable uncertainty regarding the track of an Atlantic low meeting cold air. A good good share of models keeping the system rather slack and tracking as a slider low

    www.weatheire.com



  • Registered Users, Registered Users 2 Posts: 17,609 ✭✭✭✭nacho libre


    I read it's verifying very well against the other models. I hope the gem and has the right solution, but I have a feeling we will have cold rain instead of snow or it trends too far south and most of the country remains dry, rarely do we hit the jackpot and get a snow dump. Is there anything to be said for a snow 🕺 💃



  • Registered Users, Registered Users 2 Posts: 2,839 ✭✭✭.Donegal.


    Icon has pushed the snow North and more extensive cover.

    Previous run

    image.png

    Current run

    image.png image.png


  • Registered Users, Registered Users 2 Posts: 2,839 ✭✭✭.Donegal.


    GFS previous run

    image.png

    Current

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  • Moderators, Science, Health & Environment Moderators Posts: 12,669 Mod ✭✭✭✭Meteorite58


    GFS a big shift further South on Weds, seems to be a trend developing of a more Southern route by a good few models letting the precipitation meet the cold air, a snowy run but a long way to go yet. Charts below of possible outcomes.

    4 days away.

    modusa_20250101_0600_animation.gif modusa_20250101_0600_animation.gif

    modusa_20250101_0600_animation (1).gif

    xx_model-en-324-0_moddeu_2024122818_96_949_108.png

    xx_model-en-324-0_modcan_2024122812_102_949_108.png

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    xx_model-en-324-0_modez_2024122812_102_949_108.png


  • Moderators, Science, Health & Environment Moderators Posts: 12,669 Mod ✭✭✭✭Meteorite58


    ECM 18Z a lot stronger on this run, very wet also, snow further North .

    xx_model-en-324-0_modezrpd_2024122818_93_949_149.png xx_model-en-324-0_modezrpd_2024122818_96_949_91.png


  • Moderators, Science, Health & Environment Moderators Posts: 1,556 Mod ✭✭✭✭WolfeEire
    Clare (430ft asl)


    Some very cold looking operational runs overnight, but the various ensembles do not presently favour widespread, severe cold weather conditions. The greatest risk of disruptive weather rests in Atlantic systems meeting entrenched colder air. Furthermore, the smallest change to the position of heights could have significant implications for the source of the airmass over Ireland i.e. a little further north brings an easterly component.


    In the shorter term, spot flooding on New Year's Eve into Day is possible in some parts with localised snowfall in inland Ulster and on high ground in Connacht and north Leinster. A mix of Status Yellow Wind, Rain and Ice Alerts is likely. The sharp temperature drop throughout Wednesday will be notable in light of the recent, exceptionally mild period of weather. Largely dry, bright and chilly days and frosty nights to follow.

    graphe3_10000_67_3___.png graphe0__71_5___.png

    www.weatheire.com



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  • Moderators, Science, Health & Environment Moderators Posts: 1,556 Mod ✭✭✭✭WolfeEire
    Clare (430ft asl)


    The 06Z GEFS (moyenne) has the New Year's Day low pressure system tracking further south than the 00z, thus bringing the threat of snowfall on the northern edge of the system further south. One to watch.

    gens-31-1-84.png gens-31-1-78.png

    the 06z also introduces a battleground scenario for Saturday.

    www.weatheire.com



This discussion has been closed.
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