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Snow/Ice warning for Leinster, Donegal, Cavan, Monaghan and Connacht

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    #122
    Donegal Ken
    Registered Users Posts: 427 ✭✭Donegal Ken


    Tyrone212 wrote: »
    Poor old Cavan and Monaghan missing from thread title.

    There is no weather in Cavan or Monaghan tomorrow lol


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    #123
    littlema
    Registered Users Posts: 246 ✭✭littlema


    Temperature and dew point dropping, it's also giving a snow advisory but......
    150masl s Sligo


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    #124
    Gaoth Laidir
    Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    Meteorite58 wrote: »
    A Mod might stick a yellow warning on this :)

    Might need to update the thread title too, thanks.

    Hang on, weren't you a Mod too? I hadn't noticed that you had stepped down. :confused:


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    #125
    konman
    Registered Users Posts: 234 ✭✭konman


    Is the Harmonie model that Met Eireann use the same one thats on meteociel?

    http://www.meteociel.fr/modeles/harmonie.php?ech=3&mode=1&map=523


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    #126
    Dazler97
    Registered Users Posts: 2,230 ✭✭✭Dazler97


    So cold here in mohill 3c, hopefully we get a decent snowfall


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    #127
    Nqp15hhu
    Banned (with Prison Access) Posts: 2,254 ✭✭✭Nqp15hhu


    littlema wrote: »
    Temperature and dew point dropping, it's also giving a snow advisory but......
    150masl s Sligo

    You need the wet bulb to be <0.5c for snow. Yours is about 1.8c.


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    #128
    Kermit.de.frog
    Registered Users Posts: 23,450 ✭✭✭✭Kermit.de.frog


    Lower parts of Dublin will probably get an hour or two snowfall before reverting to rain in a moderate southeasterly breeze but lasting as snow a good bit longer more inland...

    nmm_uk1-42-22-0.png?30-16


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    #129
    T2Pauly
    Registered Users Posts: 26 ✭T2Pauly


    Long time lurker first time poster, love the snow! Based in Rathcoole, Co.Dublin, 148mts above sea level, can I expect anything decent tomorrow? TIA


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    #130
    Larbre34
    Registered Users Posts: 23,797 ✭✭✭✭Larbre34


    T2Pauly wrote: »
    Long time lurker first time poster, love the snow! Based in Rathcoole, Co.Dublin, 148mts above sea level, can I expect anything decent tomorrow? TIA

    Quite likely I would say. Early on in the day anyway.

    Don't expect it to be powder for skiing though!


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    #131
    Oscar Bravo
    Registered Users Posts: 10,064 ✭✭✭✭Oscar Bravo


    Dublin Airport TAF has rain turning to Sleet lasting from 11am to 2pm

    BECMG 3109/3111 -RA BKN012 TEMPO 3111/3114 4000 -RASN BKN007


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    #132
    T2Pauly
    Registered Users Posts: 26 ✭T2Pauly


    Larbre34 wrote: »
    Quite likely I would say. Early on in the day anyway.

    Don't expect it to be powder for skiing though!

    Haha Ok fair enough that will do while we await the beast next week ❄️ ❄️


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    #133
    Slashermcguirk
    Registered Users Posts: 1,979 ✭✭✭Slashermcguirk


    Snow two weekends in a row hopefully. Bring it on


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    #134
    ninebeanrows
    Registered Users Posts: 12,778 ✭✭✭✭ninebeanrows


    Look at the progs tonight, the word SLEET comes to mind.

    We could have a good bit of wet snow falling but probably not too much lying.


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    #135
    RobertKK
    Registered Users Posts: 33,728 ✭✭✭✭RobertKK


    Met Eireann posted the various models for where snow might happen, it showed a flaw in the county warning system as north Kilkenny was in most of them for snow. But is not in the warning they issued, probably due to most of the county being unaffected.


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    #136
    Kutebride
    Registered Users Posts: 1,097 ✭✭✭Kutebride


    That was a rough day in Meath.
    When it calmed down at dusk got out with the kids for our walk a walk. It was great.

    What time is precip kicking off tomorrow folks if one was to get a run in, in advance of conditions:)


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    #137
    Kermit.de.frog
    Registered Users Posts: 23,450 ✭✭✭✭Kermit.de.frog


    Sleety_Rain wrote: »
    Look at the progs tonight, the word SLEET comes to mind.

    We could have a good bit of wet snow falling but probably not too much lying.

    We won't be getting away with the onshore southeasterly in these parts very long anyway.


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    #138
    Polar Low
    Registered Users Posts: 1 ✭Polar Low


    konman wrote: »
    Is the Harmonie model that Met Eireann use the same one thats on meteociel?

    It's the same underlying weather model (HARMONIE-AROME cycle 40) but run on a different domain, and with some different tweaks. The model on meteociel is run by the Dutch met service (KNMI).

    Met Éireann's model covers a domain extending much further west into the Atlantic, and it's tuned specifically for Ireland. Unfortunately the model data are not available online, although the output of the control member generates the forecast maps on Met Éireann's website. You can see a map of the domain and some details about the model on their website too under Science > Operational NWP (sorry, can't post a link!)


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    #139
    Nqp15hhu
    Banned (with Prison Access) Posts: 2,254 ✭✭✭Nqp15hhu


    For a guide for precipitation type, from the statistics on your weather station.

    You need wet bulb temp <0.5c.

    My current temp is 2.4c with a dew point of -1.2c which produces a wet bulb of 0.4c.

    j0Wwlkc.jpg

    With this calculator, that provides a snow risk of 50%. (But it would probably still snow because the freezing level is low and there is lots of room for evaporative cooling).

    http://www.sciencebits.com/SnowProbCalc?calc=yes

    If we raise the humidity to 80%, the dew point is -0.6c and the wet bulb temperature is 0.6c. Snow risk is 30%.

    So you need to look at more than the dew point being negative, especially the higher the temperature is.

    (The reason why the wet bulb temp is so important is because that is the temperature of the air immediately surrounding the snowflake as it falls to the surface at your elevation)


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    #140
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    Nqp15hhu wrote: »
    For a guide for precipitation type, from the statistics on your weather station.

    You need wet bulb temp <0.5c.

    My current temp is 2.4c with a dew point of -1.2c which produces a wet bulb of 0.4c.

    j0Wwlkc.jpg

    With this calculator, that provides a snow risk of 50%. (But it would probably still snow because the freezing level is low and there is lots of room for evaporative cooling).

    http://www.sciencebits.com/SnowProbCalc?calc=yes

    If we raise the humidity to 80%, the dew point is -0.6c and the wet bulb temperature is 0.6c. Snow risk is 30%.

    So you need to look at more than the dew point being negative, especially the higher the temperature is.

    (The reason why the wet bulb temp is so important is because that is the temperature of the air immediately surrounding the snowflake as it falls to the surface at your elevation)

    Just a word to add to this,we had sleet here the other evening despite negative wet bulb,negative dewpoint and an air temp of just above zero
    Layers of milder air can pocket aloft making snow a dark art in marginal circumstances
    I've seen this too often
    Its doubtful I'll be seeing any down here this time
    Marine layer
    Too close to the sea


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    #141
    Nqp15hhu
    Banned (with Prison Access) Posts: 2,254 ✭✭✭Nqp15hhu


    In this scenario I am referring to an atmosphere that is cooled to 0c down to 300-500 metres from the surface.

    You can use soundings to see if your area will have a mild layer above the freezing level. Or you can check the temperature of weather stations above your elevation to see if they are colder.


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    #142
    Donegal Ken
    Registered Users Posts: 427 ✭✭Donegal Ken


    The ECMWF Giving us a repeat for this time next week again lol


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    #143
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    Nqp15hhu wrote: »
    In this scenario I am referring to an atmosphere that is cooled to 0c down to 300-500 metres from the surface.

    You can use soundings to see if your area will have a mild layer above the freezing level. Or you can check the temperature of weather stations above your elevation to see if they are colder.

    I'm only stating that the temp from the Wetbulb thermometer in your weather station is taken at 4 to 6 feet,it doesn't necessarily follow that it's readings will mean snow or indeed won't mean snow


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    #144
    Nqp15hhu
    Banned (with Prison Access) Posts: 2,254 ✭✭✭Nqp15hhu


    Donegal Ken wrote: »
    The ECMWF Giving us a repeat for this time next week again lol

    I am not keen on these systems. They’re usually a sign of warmer air flowing in.


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    #145
    Pangea
    Registered Users Posts: 5,565 ✭✭✭Pangea


    A very tame tv forecast there after the six one, not much word of snow


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    #146
    nacho libre
    Registered Users Posts: 16,637 ✭✭✭✭nacho libre


    Pangea wrote: »
    A very tame tv forecast there after the six one, not much word of snow

    Was it Gerry giving the forecast:p?


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    #147
    nacho libre
    Registered Users Posts: 16,637 ✭✭✭✭nacho libre


    Nqp15hhu wrote: »
    I am not keen on these systems. They’re usually a sign of warmer air flowing in.

    I would take if it leads to a significant snow event. It's all very well chasing prolonged deep cold spells in fi, but as has been mentioned it is often in marginals situations we get very good snowfalls.


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    #148
    Nqp15hhu
    Banned (with Prison Access) Posts: 2,254 ✭✭✭Nqp15hhu


    nacho libre wrote: »
    I would take if it leads to a significant snow event. It's all very well chasing prolonged deep cold spells in fi, but as has been mentioned it is often in marginals situations we get very good snowfalls.

    I don’t want a significant snowfall event that is replaced by mild rain immediately after or a day or two later.

    I am quite content with a dry and crisp spell of weather. The snow will come in the form of showers.


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    #149
    Meteorite58
    Moderators, Science, Health & Environment Moderators Posts: 11,819 Mod ✭✭✭✭Meteorite58


    Gaoth Laidir wrote: »
    Hang on, weren't you a Mod too? I hadn't noticed that you had stepped down. :confused:

    About 11 months ago, I was wondering because I never got a card from you :pac:


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    #150
    SEPT 23 1989
    Registered Users Posts: 43,024 ✭✭✭✭SEPT 23 1989


    An ad for snow shovels on this thread

    The machine knows something


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    #151
    bassy
    Registered Users Posts: 6,542 ✭✭✭bassy


    very little snow and suppose to turn to rain in the afternoon tomorrow


This discussion has been closed.
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