There has been slight upgrade in next Fridays cold snap. If it comes as progged it’ll be a short one but it appears that Ulster may have some low level snow showers east on Friday and possibly through the day.
The airmass is sourced from eastern Canada and is relatively unstable. This airmass is 2c colder than the one that brought some snow showers to altitudes above 200 metres last week. So should be less marginal.
As always the further NW the better.
The old GFS has heights as low as 520 decametre.
So we will have to wait and see how this progresses.. a slight change in 850hPa will affect the final outcome.
This is my experience with these events:
-4c 850hPa = hill snow only
-7c 850hPa = low level snow in Ulster
So will be watching for those lower 850hPa’s!!