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National: Cold spell Charts/ Media/ Forecasts (Strictly no chit-chat) (15/12/2010)

24567

Comments

  • Registered Users, Registered Users 2 Posts: 9,030 ✭✭✭Tom Cruises Left Nut


    Oh it looks lovely

    h850t850eu.png


  • Closed Accounts Posts: 270 ✭✭Elmo5


    This run is looking pretty good for nationwide snow Friday afternoon and evening?


  • Closed Accounts Posts: 399 ✭✭fizzycyst


    WolfeIRE wrote: »
    Article by Fergal Tierney on Polar Low potential this weekend
    http://www.irishweatheronline.com/2010/12/polar-low-potential-for-ireland-this.html
    Hi Wolf,
    Am I correct in saying that the article says if a polar low situation does occur, it will only clip the west coast? no precipitation for the rest of the country?


  • Registered Users, Registered Users 2 Posts: 2,655 ✭✭✭delw


    WolfeIRE wrote: »
    Article by Fergal Tierney on Polar Low potential this weekend
    http://www.irishweatheronline.com/2010/12/polar-low-potential-for-ireland-this.html
    cheers Wolfe(&Su) but if that beast does come off is it not moving away from the west?

    Edit:just seen post above,sorry


  • Closed Accounts Posts: 2,667 ✭✭✭WolfeIRE


    fizzycyst wrote: »
    Hi Wolf,
    Am I correct in saying that the article says if a polar low situation does occur, it will only clip the west coast? no precipitation for the rest of the country?
    polar lows lose their verocity as they track inland fizzy but we are not accustomed to such systems here so it would be hard to predict how far inland such a system would progress. It should be pointed out that this polar low is only a possibility at this stage


  • Closed Accounts Posts: 592 ✭✭✭hotwhiskey


    t|nt|n wrote: »
    Oh it looks lovely

    h850t850eu.png

    I have noticed on the latest 18z run has the low slightly further east than earlier and the cold northerly's delayed a bit. I hope this is not the start of some downgrade for here.


  • Closed Accounts Posts: 1,530 ✭✭✭TheInquisitor


    hotwhiskey wrote: »
    I have noticed on the latest 18z run has the low slightly further east than earlier and the cold northerly's delayed a bit. I hope this is not the start of some downgrade for here.

    I have to disagree with you here. While the low is slightly further east the cold northerlys are expected on the exact same timeframe as they were 4 days ago.

    I've been watching at every update the 19:00 Thursday updates and every one of them has stayed on the same timeframe. To be honest im shockd at how well the GFS picked up this outbreak 4-5 days ago and also how consistent it has been with no real major changes since then. The models have really come a long way and they are recently starting to get VERY accurate!!

    gfs148.png


  • Registered Users, Registered Users 2 Posts: 9,030 ✭✭✭Tom Cruises Left Nut


    Easterlies :)

    h850t850eu.png

    ukwind.png


  • Closed Accounts Posts: 82 ✭✭Vizual Pics


    This Icelandic website gives a nice precipitation/temp and wind model...up until Sunday.

    http://en.vedur.is/photos/sjo_atlant_urkomuspa/101214_1200_36.png


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  • Registered Users, Registered Users 2 Posts: 2,988 ✭✭✭dirtyghettokid


    gfs148.png

    that is such an impressive image. i mean.....HOW.....can it be 4 degrees above zero (up to 8 in one small section) in greenland and BELOW zero in africa????? it just seems: :eek::eek:
    i've never seen the likes.....


  • Closed Accounts Posts: 592 ✭✭✭hotwhiskey


    I have to disagree with you here. While the low is slightly further east the cold northerlys are expected on the exact same timeframe as they were 4 days ago.

    I've been watching at every update the 19:00 Thursday updates and every one of them has stayed on the same timeframe. To be honest im shockd at how well the GFS picked up this outbreak 4-5 days ago and also how consistent it has been with no real major changes since then. The models have really come a long way and they are recently starting to get VERY accurate!!

    You are right Inquisitor just lets say i done a Frank Spencer, I had saved some weather charts from previous runs some day's ago for my own annelyise and got mixed up.:o Yes you are right the GFS has been on top of this cold outbreak long may it continue.


  • Registered Users, Registered Users 2 Posts: 4,350 ✭✭✭Daroxtar


    Has anyone linked the cold spell and snow we're getting with the volcanic eruption earlier in the year? If not then I'm callin it first :)


  • Posts: 0 [Deleted User]




  • Registered Users, Registered Users 2 Posts: 8,708 ✭✭✭Speak Now


    that is such an impressive image. i mean.....HOW.....can it be 4 degrees above zero (up to 8 in one small section) in greenland and BELOW zero in africa????? it just seems: :eek::eek:
    i've never seen the likes.....

    It's not as dramatic as it seems, these temps are 5000 feet above sea level.


  • Closed Accounts Posts: 399 ✭✭fizzycyst


    Interesting reading, thank you


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  • Banned (with Prison Access) Posts: 8,632 ✭✭✭darkman2


    It seems likely we could get frontal snow widespread and probrably heavy at times on Friday but I also expect snow showers later Thursday aswell.



    72_30.gif


    BTW we use charts at 850mb level for temperature because it is the most effective way of differentiating airmasses. Ground temperature is not used generally because of the difference between sea and land temperatures so it complicates differentiation between cold and warm air masses. It also helps because convieniently alot of precipitation originates aswell at 1,400m.

    That is why temperature charts at 850mb level are used and why they are so useful.


  • Closed Accounts Posts: 5,362 ✭✭✭Trotter


    Newbie question but how often are the charts released?


  • Registered Users, Registered Users 2 Posts: 9,030 ✭✭✭Tom Cruises Left Nut


    Trotter wrote: »
    Newbie question but how often are the charts released?

    Welcome to the world of weather !!

    Depends on the models

    This is a good link, click on each different model, ECMWF, GFS etc.

    It will tell you the update times :)

    http://www.netweather.tv/index.cgi?action=nwdc;sess=


  • Registered Users Posts: 258 ✭✭areu4real?


    You can tell this fella wants snow
    UK forecast but says a lot about whats coming
    http://news.bbc.co.uk/weather/hi/news/newsid_9282000/9282009.stm
    After the brief thaw temperatures will again plummet to below freezing by the end of the week, with further snowfall for many areas, but especially northern and western parts.

    November saw the UK's most widespread snowfall since 1965, and December has continued to be exceptionally cold and snowy.

    With only twelve days left to go, many will be hoping for a white Christmas, while others will be hoping for some respite from the difficulties the heavy snow has brought.


  • Registered Users, Registered Users 2 Posts: 14,583 ✭✭✭✭M.T. Cranium


    That bow-shaped front ahead of the Greenland express is partly high cloud so the "express" actually begins at the trailing edge of the bright cloud, not the leading edge. That leading edge will overspread Ireland later today (meaning Wednesday) but the winds will then be westerly at 20-30 mph with spits of rain in a 5-8 C air mass that was earlier reported over Jan Mayen at 71 deg N ... they have since had a windshift to NNW and temperature drop of about ten degrees so far.

    I'll report in this thread on Jan Mayen weather conditions at various times and later, Thorshavn in the Faeroes as the front rips through there on Wednesday afternoon.

    With everything getting super-busy on the forum, I'll just mention once in each forum that any significant forecast updates that I want to make will appear in the forecast thread, not in these discussion threads (at least I won't be cross-posting them). So if you're wondering about that, always check the forecast thread rather than hunting through pages of other threads.


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  • Registered Users, Registered Users 2 Posts: 14,322 ✭✭✭✭leahyl


    Latest ME forecast sounds very good indeed! Didn't see any mention of sleet or rain for the weekend anyway but maybe I'm ignoring the bits I don't like! I'm awake at 5.50am - there MUST be snow in the air:D

    http://www.met.ie/forecasts/


  • Registered Users, Registered Users 2 Posts: 14,583 ✭✭✭✭M.T. Cranium


    Just starting into the morning forecast. The 00z GFS run appears to be flawed, there are some odd changes that are not in sync with earlier runs or other models at same time (00z). GEM, UKMO then ECM reviewed, the odd GFS output is not confirmed there. Think that later consensus may be leaning towards specific GFS ensemble members. Otherwise, cold spell and snow potential seems about as before. Heading over to do some forecast writing.


  • Registered Users, Registered Users 2 Posts: 8,708 ✭✭✭Speak Now


    From the (Flawed??) 0z GFSt850Dublin.png


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    0Z GFS wasn't the best alright. Much prefer the 0Z ECM.

    Still a good deal of uncertainty with regard to specifics even in the usual reliable timeframe.

    GME (not the greatest of models) throws up a serious looking winter storm :

    gme-0-108.png?00


  • Closed Accounts Posts: 592 ✭✭✭hotwhiskey


    The Fax for Saturday looks very promising for the north and west and later down into parts of Munster.

    chart.png


  • Registered Users Posts: 483 ✭✭little bess


    On the netweather model discussion thread they're talking of a downgrade on the latest gfs , how does this latest gfs affect Ireland in general ?


  • Registered Users, Registered Users 2 Posts: 8,708 ✭✭✭Speak Now


    Just starting into the morning forecast. The 00z GFS run appears to be flawed, there are some odd changes that are not in sync with earlier runs or other models at same time (00z). GEM, UKMO then ECM reviewed, the odd GFS output is not confirmed there. Think that later consensus may be leaning towards specific GFS ensemble members. Otherwise, cold spell and snow potential seems about as before. Heading over to do some forecast writing.
    On the netweather model discussion thread they're talking of a downgrade on the latest gfs , how does this latest gfs affect Ireland in general ?

    If had scrolled back one page you would have seen M.T's thoughts on the 0z GFS. 06 GFS rolling out now so we'll know soon enough if it's a new pattern of if it's binned.


  • Registered Users, Registered Users 2 Posts: 8,708 ✭✭✭Speak Now


    [URL="javascript: viewimage(1);"]h850t850eu.png[/URL]


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Out to 132 hours, 06Z GFS has colder air over us than on the 0Z run, so less chance of snow turning to sleet/rain in places on this run (so far).

    But looks like we could be back to rain from 144 on...


  • Moderators, Science, Health & Environment Moderators Posts: 4,467 Mod ✭✭✭✭mickger844posts


    Just to show how fast this cold air will arrive. Within 12 hours 850 uppers dropping by 10c

    10121606_1506.gif

    10121618_1506.gif


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  • Registered Users, Registered Users 2 Posts: 1,461 ✭✭✭Musicman2000


    GFS o6z looks better than the 00z run, think it had a littel wobble:)


  • Registered Users, Registered Users 2 Posts: 9,030 ✭✭✭Tom Cruises Left Nut


    GFS o6z looks better than the 00z run, think it had a littel wobble:)

    Probably out last night !! ;)

    Am I right in thinking this would be good for the East guys ?

    h850t850eu.png


  • Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 18,150 Mod ✭✭✭✭DOCARCH


    t|nt|n wrote: »
    Probably out last night !! ;)

    Am I right in thinking this would be good for the East guys ?

    Looks a little better. 06z pushes that low centre a little further south.


  • Closed Accounts Posts: 107 ✭✭typhooner


    nice little low feature on the Fax chart poasted above, the triple point is well out west in the Atlantic so no milder sector is going to come over us


  • Registered Users, Registered Users 2 Posts: 2,577 ✭✭✭dak


    Meteoalarm now have Ireland on Orange Alert from Thursday!


    http://www.meteoalarm.eu/index2.php?lang=&country=IE&day=0


  • Moderators, Science, Health & Environment Moderators Posts: 4,467 Mod ✭✭✭✭mickger844posts


    Friday night looking good for most, not a lot of precipitation around on Thursday according to GFS.

    10121721_1506.gif


  • Moderators, Motoring & Transport Moderators Posts: 6,522 Mod ✭✭✭✭Irish Steve


    ME RTE 1 forecasts are still being very short term in their predictions, they've not talked about anything beyond tomorrow on either of the broadcasts this morning, the only hints are the 4 following days maps that are shown without comment at the end of the broadcast that have snow symbols on them scattered around the country.

    I get the impression that they are desperately trying not to create a situation where they're backed into a corner on precise "what", and given the way the models appear to be varying, I can understand that, they get as much grief for a wrong bad weather forecast as they do for not forecasting it at all, and they've had experience of both recently, there was almost no advance notification of the 15 Cm that hit Ashbourne at the end of the last batch of snow falls.

    MT seems to be painting a very thought provoking canvas, and the models are backing that up, a mixture of 62/3, 75 & 82, with the worst aspects of all of them combined into one event is certainly something that is not going to be a fun event for a lot of people.

    I've seen the 82 pictures that were posted earlier, I wasn't here then, and it looks like the Dublin area took a big hit. I know from local comments that Ashbourne was well hammered, what I don't know is how long it lasted. In the South west of the UK, it was about a week before it was safe to venture too far if I remember correctly, the roads were then passable with care.

    The latest 5 day on ME is showing some possibly challenging conditions for the South coast on Monday, but very little throughout for the East Coast and Leinster area, which seems to still be very much at variance with almost all the other comments and posters.

    Time will tell

    Steve

    Shore, if it was easy, everybody would be doin it.😁



  • Closed Accounts Posts: 9 eoinbergin


    Hey guys i have been looking at some of the dew charts for thursday and it appears from noon on we reach 0 and steadily drop after does anyone have a good map on predicted precipitation for the dublin area for thursday

    Thanks


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  • Registered Users, Registered Users 2 Posts: 7,703 ✭✭✭whippet


    I know from local comments that Ashbourne was well hammered, what I don't know is how long it lasted.

    the '82 snow in ashbourne is sort of vague in my memory (I was only 5 back then) .. but from my parents memories travel outside of ashbourne was impossible for a week and some parts outside of the village (it was a proper village back then) needed supply drops and special missions to get supplies to people.

    There was talk of the Ashbourne House Hotel being open 24hours a day for the week for people to sleep on the floor and to be fed and watered!!

    As tough as it sounded, by all accounts it is recalled fondly


  • Registered Users, Registered Users 2 Posts: 16,956 ✭✭✭✭nacho libre


    eoinbergin wrote: »
    Hey guys i have been looking at some of the dew charts for thursday and it appears from noon on we reach 0 and steadily drop after does anyone have a good map on predicted precipitation for the dublin area for thursday

    Thanks

    click on nedbor
    http://www.dmi.dk/dmi/index/danmark/vejrkort.htm


  • Registered Users, Registered Users 2 Posts: 8,708 ✭✭✭Speak Now


    whippet wrote: »
    As tough as it sounded, by all accounts it is recalled fondly

    Yes they're not the moaning generation like we have now ;)


  • Moderators, Science, Health & Environment Moderators Posts: 4,467 Mod ✭✭✭✭mickger844posts


    eoinbergin wrote: »
    Hey guys i have been looking at some of the dew charts for thursday and it appears from noon on we reach 0 and steadily drop after does anyone have a good map on predicted precipitation for the dublin area for thursday

    Thanks

    This is the best i could find

    10121609_1506.gif


  • Registered Users, Registered Users 2 Posts: 8,225 ✭✭✭Ciaran500


    What are conditions before the front arrives tomorrow going to be like? I'll be outside working tomorrow till we have to abandon it.


  • Registered Users, Registered Users 2 Posts: 16,956 ✭✭✭✭nacho libre


    The BBC forecaster just mentioned less cold conditions in the south as early as Sunday.

    Of course that could mean just the south of England. the danger is that milder atlantic air will be able to sneak back in with these low pressures nearby.


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  • Moderators, Category Moderators, Computer Games Moderators, Society & Culture Moderators Posts: 8,527 CMod ✭✭✭✭Sierra Oscar


    Did anyone catch the forecast after the One News?


  • Closed Accounts Posts: 3,548 ✭✭✭Harps


    Yeah it was much the same as last night, the front will pass over, turning to snow on high ground and later there'll be showers in the north. It'll start off mild but be sub zero by the evening

    She committed cold up to Monday though with snow on the chart every day.

    On a related note, they really need to change their rain/sleet/hail/snow animations, its very hard to tell the difference between them all


  • Moderators, Science, Health & Environment Moderators Posts: 4,467 Mod ✭✭✭✭mickger844posts


    Did anyone catch the forecast after the One News?

    Nothing special in it really. She just said it would be wet tomorrow followed by cold with Wintry Showers in the North and West. The only thing of note was in the charts at the end where they had snow for the south and east for Sunday/Monday.


  • Closed Accounts Posts: 12 Hammy_irl


    Harps wrote: »
    On a related note, they really need to change their rain/sleet/hail/snow animations, its very hard to tell the difference between them all

    I'd say they probably do that on purpose to cover their asses!

    I get the feeling more and more that this event is becoming more and more "tame"!?


  • Registered Users, Registered Users 2 Posts: 1,772 ✭✭✭woolymammoth


    I've seen the 82 pictures that were posted earlier
    where were those posted? :confused:


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