I’ve posted about how the Icon typically isn’t warm biased since it’s often 2nd coldest only to CMC for lows unless over winter precip cover when GFS sometimes gets insanely cold (<0F) like it did after the icestorm last week. Whereas that’s usually true, it isn’t this morning over deep snow, where Icon is much too warm in some areas! So, perhaps Icon tends to be too warm over deep snow.
I’ve also talked about UKMET often being too warm for lows this winter, which is true although that’s been with no deep snow. I’m stunned to see the role reversal of UK being the coldest/too cold over deep snow vs no snow. And I’ll also check the 0Z GFS/Euro/CMC for 7AM:
Icon/UK/GFS/Euro/CMC
Over deep snowcover (NC):
CLT 15/-3/10/-1/5; actual 11
FAY 17/11/10/13/14; actual 18
RDU 18/16/13/13/15; actual 12
GSO 16/5/13/12/6; actual 6
So, avg miss over
deep snow
Icon/UK/GFS/Euro/CMC:
+4.8/-4.5/-0.3/-2.5/-1.8
Warmest Icon, Coldest UK, meaning role reversal!
Over (near) bare ground (GA):
SAV 21/21/27/24/18; actual 24
Columbus 24/26/26/27/17 actual 22
NE ATL 23/25/28/24/15; actual 19
Rome: 24/25/22/24/11; actual 21
So, avg miss over
bare ground
Icon/UK/GFS/Euro/CMC
+1.5/+2.8/+4.3/+4.3/-6.3
Warmest GFS/Euro, coldest CMC, with this being the more typical
Sources: 0Z hour 12 of these models:
Icon
UKMET
GFS
Euro
CMC
