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Frost, Ice and Possible Snow Showers this Weekend (13th-16th Dec 08)
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10-12-2008 11:07pm#1
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no?? Do you want to post what you have seen from the 18z so we all see what you are referring toJanuarySnowstor wrote: »Did you not see the West of Ireland laden with snow.
This event (like all great snow events in history) has popped out of the blue.
Im certain the West will see heavy snow on Saturday.
As is the norm the Irish Met will lag behind
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I dunno how to post links but it shows heavy ppn moving South over Western Ireland on Saturday with temps at 1C, sub 528 dam air and -5 uppers.no?? Do you want to post what you have seen from the 18z so we all see what you are referring to
It's a certainty if the charts dont change but mostly for the West and South
Couple this with the beebs forecast just gone and the 5 dayer showing snow for Cork
Type in Cork Airport0 -
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Of course when there is a chance of snow, i always sit and take note but with the variables you posted above maybe are marginal for lower ground. The lads in Kerry at height may have something better. Here is the precip chart but snowline going for 200m atm. Might be of interest closer the timeJanuarySnowstor wrote: »I dunno how to post links but it shows heavy ppn moving South over Western Ireland on Saturday with temps at 1C, sub 528 dam air and -5 uppers.
It's a certainty if the charts dont change but mostly for the West and South
Couple this with the beebs forecast just gone and the 5 dayer showing snow for Cork
Type in Cork Airport0 -
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Yea seen that but that usually indicates showersnacho libre wrote: »
but on the precipitation chart for late saturday it showed tons of snow just off the west coast of ireland.
Edit: the fax has series of troughs in the polar maritime airstream.
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Yea seen that but that usually indicates showers
still a bit confused. sorry.:o
do you mean snow showers or do you mean the precipitation would be in the form of showers of rain once they hit land?
if that's the case, one thing i don't understand is, why would the bbc chart be laden with snow when it's from that direction(off the west coast), also given that the atlantic usually would modify any cold airstream from a westerly or north westerly direction enough to ensure the air temperatures would be too high for snow off the west coast of ireland. i know sometimes we get snow if the source is way up in a cold region of the north atlantic(like greenland) but this doesn't seem to be the case this time.0 -
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That graphic indicated snow showers and the fax i posted would back that up with the troughs or organised bands(subject to change of course)nacho libre wrote: »still a bit confused. sorry.:o
do you mean snow showers or do you mean the precipitation would be in the form of showers of rain once they hit land?
Tbh, thats the first time i have seen the graphic indicating the whiteness this far south this year out west in the Atlantic. What usually tends to happen, when a trough moves through in polar maritime air, the air tends to chill more behind it. As the air is sourced more GL, the upper air or cold air aloft would create instability over warmer seas and some potent troughs arise.if that's the case, one thing i don't understand is, why would the bbc chart be laden with snow when it's from that direction(off the west coast), also given that the atlantic usually would modify any cold airstream from a westerly or north westerly direction enough to ensure the air temperatures would be too high for snow off the west coast of ireland. i know sometimes we get snow if the source is way up in a cold region of the north atlantic(like greenland) but this doesn't seem to be the case this time.
As with intensity of a shower, the precipitive cooling would most likely result in snow reaching lower levels even in +4C air temp to begin with. Most likely the UKMO model recognises that and produced the graphic for it albeit not accurately i think. That graphic just seems to plaster shed loads of snow out west of Ireland indicating showers and the nature of showers is you just don't know where they will fall. No frontal stuff is charted around for that time. 0 -
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JanuarySnowstor wrote: »Im certain the West will see heavy snow on Saturday.
Will hold you too that. 0 -
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I don't know what GFS you are looking at but if it is the same as mine,I think you need glasses.JanuarySnowstor wrote: »06z coming out and still showing heavy snow for the Western half of the country. East looks mainly dry
-5 850 air off a maratime atlantic [polar maratime air] with temps of 3 to 7 c...
Thats rain unless you are climbing Mt Brandon or Carrantouhill.
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7 on the coast-it's the undercut of that surface air that really kills it.Always repeat always when looking for snow look at the upstream surface air temp.
3c in clare and 2 c well inland 4c in kerry 2c in NW Cork with at best 0c dewpoints.
It's all there on the map.
-5c 850 air is not enough for snow in Ireland below 2500ft.
Come on now-be a tad realistic 0 -
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