Well actually the 1981-2010 average is 23.2 air frosts each winter so been running well below average for a few years now compared to that. I am running ahead of the last few years this year though. Last year was just 8 total and the year before was 7 total(all in Jan and Feb). I am in somewhat of a frost hollow which is why that average is surprisingly high for my coastal location.
All rain and hail for me then and even missed all the lightning. Not happy. Don’t know which date that was exactly but 90% of all North-westerlies end up like that here anyway so don’t need to know.
I was going to mention this. Noticed it was down to 7.2°C, average I think was 7.5°C. Still not convinced, don’t think the 850s are cold enough, but anything can happen I suppose with prolonged precipitation so let’s wait and see.
Minimum overnight 1.8°C, currently 3.6°C.
At this time of year for falling snow here from a maritime source I need:
At 850s above -6 - a trough/shortwave bringing prolonged torrential precipitation for at least 1 hour dropping the 2m temperature to below 1.7°C with at least a slight element of an off-shore wind on its back edge.
At 850s between -6 and -8 - thicknesses of 519 dam or less; negative dew points; a 2m temperature below 1.7°C; a slack flow; and/or a trough/sshort-wave with prolonged precipitation ideally backing wins of—shore on its back edge.
At 850s between -8 and -10 - thicknesses of 525 dam or less and/or a slack flow and/or negative dew points.
At 850s below -10 falling snow is almost a certainty.
I’m expecting an air frost tonight here and a hard one at that. Met apps are suggesting otherwise but I told you all what I thought of them last night.
Think there could be some surprises overnight as long as we get the precipitation. Cannot see any reason why Snow wouldn’t fall to low levels; at least on the back edge.usual overestimation of temperatures by the Metin an off-shore wind, seen it so many times.