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24-02-2017, 18:19   #1
V_Moth
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Sunday/Monday (26/27-2) - Snow along west coast

GFS is going with snow for a broad area of the west coast on Sunday night and Monday morning. The main counties affected look like Donegal, Mayo, Galway, Kerry and west Cork. The model shows snowfall possible into west Leinster.

Accumulations of 1-2cm in places. It looks like there is a band of rain following behind this so probably won't last.


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24-02-2017, 21:26   #2
Meteorite58
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Looks like a cold night Sun into Monday, Temps going below zero in places inland away from coasts according to the GFS but not the ARPEGE atm, breezy on the coasts, dew points look good according to the GFS, 850hpa temp looks reasonable , precipitation on the coastal counties early and moving inland. Certainly interesting but in my amateur opinion I would be leaning more to snow on mountains and perhaps rain/sleet lower down with perhaps some wet snow on higher ground. Interesting to see which model has the more accurate temperatures, GFS is normally quite good. Certainly pulling down cold polar airs, but over too long a fetch coming in from the W ? Will be keeping an eye on it.









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25-02-2017, 01:01   #3
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Having a closer look at this and it would seem that indeed there could be a fine coating of snow ( even if it is coming in from the W ), mainly hills and mountains but possible lower down too early Mon morning along Atlantic coastal counties .Mon looking very cold by the GFS and easy to see why when you see the advection of cold air down from Greenland courtesy of that very deep low off Greenland that dropped to 940hPa. Dam looks good .

https://twitter.com/NWSOPC/status/835243314790207489








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25-02-2017, 06:18   #4
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Interesting; expect heavy traffic on the forum today!

And thanks for the warning...
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25-02-2017, 12:18   #5
JCX BXC
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Clare isn't a county I assume Op?
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25-02-2017, 12:18   #6
Meteorite58
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Plenty of precipitation Sun night/ Monday of one sort or another from showers and that trough mainly on the Western side of the country. Could be an interesting day with even the chance of thunder.

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25-02-2017, 13:27   #7
Iancar29
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528 dam line passes over the country tomorrow night.

12z Sunday

00z Monday


Usual suspects should see some snow, Mountainy man - Sligo , the NW, above 150m. Further south , id say 250m and then further east, if anything substantial makes it across then snowline probably around 350m.

Nice to have a few days of interesting weather close together.
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25-02-2017, 18:36   #8
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Big difference between the models on 850 hPa temperatures for midnight tomorrow night. On one extreme the Hirlam has -6 °C while the Arpege has only -2 °C. As this level is 200-300 m lower than standard (only ~1200 m amsl) the difference is probably down to how each model handles modification over the long sea fetch. No doubt the warmer Arpege solution will win out...



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25-02-2017, 19:43   #9
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26-02-2017, 08:48   #10
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Knock Airport TAF has snow showers in the forecast from 9pm tonight, Shannon Airport TAF has sleet showers in the forecast from midnight tonight.
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26-02-2017, 11:31   #11
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Knock forecasting light showers of snow from 9pm tonight to 12pm tomorrow (as far as the TAF goes), and possible moderate snow showers from 4am in the morning.

Shannon Airport forecasting light showers of sleet from 1am tonight to 12pm tomorrow, and possible light showers of snow from 9am-12pm tomorrow.

Cork airport forecasting possible light showers of sleet from 2am tonight.
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26-02-2017, 11:46   #12
Gaoth Laidir
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It still looks like a very watered down affair with not really a direct feed from Greenland. Looks like the warmer Arpege solution will win out.
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26-02-2017, 12:34   #13
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Yes, unfortunately, even though the bbc precipitation radar shows a lot of snow showers pushing into the west tonight.
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26-02-2017, 12:58   #14
Gaoth Laidir
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Eurocontrol's daily assessment has those showers as rain at midnight tonight, with some snow over land, most likely on high ground. Taken from here

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26-02-2017, 13:15   #15
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UK Met office on the BBC giving fairly widespread sleet and snow showers over Ireland tonight, and more in western areas tomorrow with some making it east.
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