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Friday Jan 2nd onward, very cold with snow potential: Event buildup/discussion

  • 28-12-2025 07:46PM
    #1
    Registered Users, Registered Users 2 Posts: 26,103 ✭✭✭✭


    As of 28th December for Friday 2nd January onward

    I am just doing a low weight preliminary post here out to next weekend. Far too speculative to move beyond that for now though feel free to speculate in the thread and discuss away. I'll update this OP in coming days as things evolve.

    Potential hazards: Snow, Ice, Low Temperature

    Highest disruption risk: Ulster, West Connacht

    Risks elsewhere: Ice, Frost, Cold Temperature

    Possible warning level: Yellow (mainly northwest)

    It's very likely now that much colder air will be arriving in Ireland from Friday as high pressure positions itself to our west and low pressure to the east allowing northerly winds and airmass from the high Arctic to come down over the country.

    At some point Friday, likely later in the day, a cold front should be moving south and that's the vanguard, the deeper cold Arctic air following behind.

    Untitled Image

    Note: There could well be a mix of rain, sleet and snow in that front so that's something to watch as it moves down through the country.

    With snow showers getting going in the northwest by Saturday morning accumulations can reasonably be expected there at that stage

    image.png

    Daytime Temperatures

    By next weekend temperatures will really be struggling to get above freezing for most, if even. It's that time of year when the sun is at it's weakest angle and the solar radiation isn't really at a level to thaw lying snow, ice or frost in such an airmass even in direct sunlight so if you do get snow it's going to be hanging around.

    image.png

    Night time temperatures

    Probably somewhere in the range of -1 to -6c particularly under light winds and clear skies inland. Locally over snowfields it would be colder and that's most likely in the northwest.

    image.png

    It' still early days here but the ball is rolling on this within the timeframe (6 days) where it's not overly speculative and there is good cross model agreement for next weekend. Beyond that we have to see how things evolve.

    For now be aware the weather is going to get much colder by some stage next Friday, and it will be very noticeable across the country especially at night. There is the potential for snowfall but we need to see how this goes because that potential could become much wider in the coming days depending on various scenarios we'll tease out here.

    So be aware of it but it's not time yet to crack each other's heads open and feast on the goo inside 😉

    Post edited by Meteorite58 on


«13456737

Comments

  • Registered Users, Registered Users 2 Posts: 27,813 ✭✭✭✭Larbre34


    We have adequate threads to deal with low probability potentials, like the general winter thread.

    This is ridiculous and premature in the extreme. And it is overly speculative.



  • Registered Users, Registered Users 2 Posts: 33,895 ✭✭✭✭zell12


    The weather is incredibly benign this winter. so far.



  • Registered Users, Registered Users 2 Posts: 7,248 ✭✭✭CrowdedHouse


    Connacht

    Seven Worlds will Collide



  • Moderators, Science, Health & Environment Moderators Posts: 13,347 Mod ✭✭✭✭Meteorite58


    Mod Note: Larbre34 need to knock it off, please remain civil, you have made your opinion and point well known over various threads.

    Let's keep this friendly and welcoming to all that wish to post on the topic.



  • Registered Users, Registered Users 2 Posts: 3,493 ✭✭✭Rebelbrowser


    As Meteorite has said, when there is such potential even a bust of a thread is justified simply to record the evolution of same. The OP makes clear the risks / probabilities. Life is short, enjoy these chances to post on possible snow, however unlikely for some areas!



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  • Registered Users, Registered Users 2 Posts: 388 ✭✭YanSno


    N to NNE unstable airflow pretty much locked in next weekend, it will get considerably cold around the 2nd and 3rd, how long it will sustain is the question and in my opinion it will hang around a bit longer as models are predicting at the moment. Polar lows will be in the mix



  • Registered Users, Registered Users 2 Posts: 7,766 ✭✭✭pauldry


    This cold new year has been on the models a long time now so at worst 2 or 3 days with sleet and snow in them at best a 9 day session of snow but more likely in between with some areas seeing snow and others mainly South getting little until maybe the battlefield breakdown takes place near or before mid January.



  • Registered Users, Registered Users 2 Posts: 407 ✭✭rooney30


    The consensus here is that it deserves its own thread , thanks for starting Kermit



  • This content has been removed.


  • Registered Users, Registered Users 2 Posts: 654 ✭✭✭Captain Snow


    We are going to have snow falling on frozen ground. What a start. Ordered my new snow shovel last week. Great timing.

    R.I.P MT.



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  • Registered Users, Registered Users 2 Posts: 165 ✭✭Thorny Queen


    I'm gonna order the sledges now!



  • Registered Users, Registered Users 2, Paid Member Posts: 1,118 ✭✭✭Technophobe


    Hopefully plays out well for us all..



  • Registered Users, Registered Users 2, Paid Member Posts: 6,089 ✭✭✭Widdensushi


    Good for site traffic.... good time for a sun trip away.



  • Registered Users, Registered Users 2 Posts: 3,961 ✭✭✭Working class heroes


    Racism is now hiding behind the cloak of Community activism.



  • Registered Users, Registered Users 2 Posts: 26,103 ✭✭✭✭Kermit.de.frog


    I find it hard to understand the disregard sometimes for other parts of the country just because it might not snow in one's own backyard.

    I like seeing beautiful pictures and videos from parts of the country getting proper winter weather ❄️☃️



  • Registered Users, Registered Users 2 Posts: 3,961 ✭✭✭Working class heroes


    1/10

    Racism is now hiding behind the cloak of Community activism.



  • Registered Users, Registered Users 2, Paid Member Posts: 1,717 ✭✭✭DayInTheBog


    In before the travel questions.

    Will I be able to walk out into the yard over the weekend without facing a 5ft snow drift like last year.

    At least I'm off for a few days. I'm glad I fed my bees some fondant yesterday.



  • Registered Users, Registered Users 2, Paid Member Posts: 6,089 ✭✭✭Widdensushi




  • Registered Users, Registered Users 2 Posts: 393 ✭✭kittyn


    Can we not behave like adults here guys and if you don’t like the thread then keep scrolling?? This is a thread for people to discuss the charts and the possible potential!!



  • Registered Users, Registered Users 2, Paid Member Posts: 2,367 ✭✭✭CruelSummer


    Interesting scenario ahead. With schools and a lot of people who took time off over Christmas due to return to work Jan 5th, this could cause travel disruption if the predictions hold firm for another few days. Also I remember in 2010 and another time also some people’s water pipes bursting. While the weather looks very interesting ahead, it does bring hardship and inconvenience for many. However a few ice/frost and snow days are rarer now than ever so bring it on!



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  • Registered Users, Registered Users 2 Posts: 15,579 ✭✭✭✭stephenjmcd


    We await further runs but not much point in mentioning 2010 at this moment.

    It looks largely dry with any snow potential as it stands largely confined to northern areas.

    Lets see what the charts show over the coming days but currently for the majority its cold, frosty and ice, a normal winter cold snap



  • Registered Users, Registered Users 2, Paid Member Posts: 6,089 ✭✭✭Widdensushi




  • Registered Users, Registered Users 2 Posts: 26,103 ✭✭✭✭Kermit.de.frog


    The system which is moving more toward the English channel on successive runs (below centered in the Bay of Biscay) could be important for eastern areas as it brings a north-easterly element to the wind direction on it's northern flank which could bring snow showers in to coastal counties but it's a delicate evolution and plenty of time to go yet.

    Untitled Image

    For the curious, GFS 18z temperatures Sunday 1pm

    Untitled Image

    I wouldn't be surprised if that system had bigger impacts on us in the end.

    Post edited by Kermit.de.frog on


  • Registered Users, Registered Users 2 Posts: 26,103 ✭✭✭✭Kermit.de.frog


    A distinct northeast pivot in the latest GFS ensemble surface pressure mean. Need to see what type of support this has in the morning from the other major models. Needless to say anything like this would shift the focus more to the east coast for snowfall.

    Untitled Image


  • Registered Users, Registered Users 2 Posts: 2 Waza_67


    I’ve followed the winter and cold-weather threads here for years, even if I haven’t posted. Credit where it’s due, the regular contributors and they know who they are consistently put real effort into analysing charts, explaining signals, and keeping these threads informative, especially in uncertain setups like this. Thanks for that.
    Healthy scepticism is always part of weather discussion, but debating whether a thread should exist is largely beside the point. The purpose here is to track potential developments as they emerge, not to call the outcome days in advance. Those not interested can simply scroll on many of us are here to follow and learn from the evolution.



  • Registered Users, Registered Users 2 Posts: 407 ✭✭Condor24


    Definitely much colder weather coming. That's the easiest to say. Snow, well, that's an entirely different matter, and will need a few more days to sort out. Hoping for no damp squids this time. More frozen ones please. We've been burnt badly in recent years. I'm sceptical, I'll openly admit, re widespread snow, but let's see how it develops from here.



  • Registered Users, Registered Users 2 Posts: 2,291 ✭✭✭John.Icy


    Bingo.

    Bit of snow snobbery towards anything from the north or north west from some in the east. "Muck" its often called, yet winter after winter its the only source of snow for much of the island.

    We've had several easterlies since 2018 and they've all been piss poor - snizzle or cold rain galore. We're really in no place to be turning our nose up at snowfall.

    Looking forward to tracking this. GFS remains best for a more pronounced swap to NE winds to drag more of the island (by population) into the potential. I know some are hoping for magical blocks to our N or NW that last for 10 days but that simply isn't realistic. The modern winter needs to make use of the 3-5 days you can get out of a retrogressing high + it's equally quick collapse or waning - and within that waning, hope that the cold stays in situ and you get the goods without particularly nice overall synoptics. Still hope of some rebuilding down the line, but those hoping the building Greenland high magically stays put with the same strength for 7 days, look away.

    GFS tonight, just picked a snow chart (JFF) cumulative by the 5th Jan.

    xx_model-en-324-0_modusa_2025122818_183_949_108.png

    Just my two pence on the latest "why a thread!". Have people ever actually went back all the way to the early 2000's on the forum? Thread after thread about sleet potential. The forum has NEVER operated on a basis that threads are only made for the most severe weather - people pushing this are just telling porkies. Personally, the sectioning off of any deviation from the mean weather-wise has created an absolutely unbelievable archive of weather charts, images and personal stories on here. Even if 50% of threads amass to nothing after the buildup and "watching brief" portion…in the politest way possible - if this triggers you, get a holy grip of yourself. Like it really doesn't matter in the grand scheme of life.

    Anyway, enough on that topic, it's been done to death today already, so apologies for further adding to the pile

    Onto the morning runs and hopefully lots more snow depth charts to fool ourself with.



  • Registered Users, Registered Users 2 Posts: 124 ✭✭Gizit


    18z ECM AI is a real doozy. No flash in the pan few days of cold. Keeps the cold in right to the end



  • Registered Users, Registered Users 2 Posts: 2,291 ✭✭✭John.Icy


    ECM 18z AI. A good illustration that you can lose the blocking in terms of ideal positioning and strength, but lock in the cold nonetheless and get further snow chances. I know our JS is very worried on Netweather re: the blocking, and while the concern is valid, it's not a guaranteed spell-ender. The waxing-waning of blocking is something the teleconnections folks on Netweather have been suggesting in recent days as something possible.

    Untitled Image

    Untitled Image


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  • Registered Users, Registered Users 2 Posts: 1,930 ✭✭✭snowgal


    hoping on board the 🚂 ❄️! I’ll jump on any chase, we all know at this stage how it can or can’t work out. But let’s see, and just enjoy what comes! Colder weather in itself would help me



This discussion has been closed.
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