Those snow forecasts charts are pure trash at the best of times.
Originally Posted by: Chunky Pea
I actually think they are better than 850hpa temperatures as long as they are used right. The GFS charts come in a variety of resolutions, always use 0.25 degree precip type charts; low resolution causes snow to appear worse than it is because of 9 point smoothing. Also showers are smoothed in time over 3 hours and made to look like persistent snow; this is something to bear in mind.
My advice is to use 0.25 degree charts on a European wide level. I'd also avoid netweather as their precip type chart viewer is badly coded (hint: GFS does NOT understand sleet; any GFS chart with sleet being shown on it is basically an advert saying: I haven't put enough time into making this chart!).
850s are of course okay but people abuse them so much by using some constant benchmark like the -6C line without taking into account any nuonce which is ridiculous given that on the dry air ahead of an ana warm front an 850hpa temp of 0C can support snow sometimes.
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)
Total: 8 days with snow/sleet falling.
2022/2023 Snow days (approx 850hpa temp):
18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)
Total: 7 days with snow/sleet falling.
2021/2022 Snow days (approx 850hpa temp):
26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.