TSSN+ Posted January 21 Share Posted January 21 On 1/21/2025 at 1:03 AM, mattie g said: What is this image showing? Expand Where the snow cover is. Colder Link to comment Share on other sites More sharing options...
snowfan Posted January 21 Share Posted January 21 On 1/21/2025 at 1:03 AM, mattie g said: What is this image showing? Expand That’s long wave infrared and the darker colors = colder surfaces resulting from the deeper snowfall. Link to comment Share on other sites More sharing options...
poolz1 Posted January 21 Share Posted January 21 Radiating nicely. 6/0 1 Link to comment Share on other sites More sharing options...
nj2va Posted January 21 Share Posted January 21 -4 / -7 at Deep Creek. 17 / 1 here at home. 2 Link to comment Share on other sites More sharing options...
pazzo83 Posted January 21 Share Posted January 21 DCA with its first sub freezing high and sub 20 temp of the year today. Currently 19F (20F at the 8pm ob, but it has no doubt dropped to 19 now). 15.6F here. Single digits likely in the colder areas inside the beltway. 1 Link to comment Share on other sites More sharing options...
WVclimo Posted January 21 Share Posted January 21 Elkins, WV is already -8, below the forecast low of -5. 2 Link to comment Share on other sites More sharing options...
Kay Posted January 21 Share Posted January 21 17 Link to comment Share on other sites More sharing options...
EastCoast NPZ Posted January 21 Share Posted January 21 Down to 5F already. Holy shit! 2 Link to comment Share on other sites More sharing options...
Terpeast Posted January 21 Share Posted January 21 14.5 and dropping Link to comment Share on other sites More sharing options...
Warm Nose Posted January 21 Share Posted January 21 11/-5 Link to comment Share on other sites More sharing options...
T. August Posted January 21 Share Posted January 21 15.9° - I don’t think mby will hit lower than 10°. Most modeling has 9-11° tonight, with the lowest occurring around 4AM before the clouds roll in. Link to comment Share on other sites More sharing options...
wxmeddler Posted January 21 Share Posted January 21 The dew points would indicate most of the area above the fall line could get to zero by morning if you have good snow cover. 1 Link to comment Share on other sites More sharing options...
wxdude64 Posted January 21 Share Posted January 21 On 1/21/2025 at 12:17 AM, mappy said: Morning low won’t hold. Down to 11, after a high of 22 Expand Same here. Low was 12.2 around 8:30 am after 13.6 at 7 am. Currently 10.2/-5.6 at 8:40 pm. Forecast low is 5, may go lower. Link to comment Share on other sites More sharing options...
HighStakes Posted January 21 Share Posted January 21 4 here in the valley. Another close by station is at 2. Link to comment Share on other sites More sharing options...
LordBaltimore Posted January 21 Share Posted January 21 On 1/21/2025 at 12:38 AM, wxmeddler said: Really obvious where the heavier snow fell: Expand if this wasn't an advective cooling night I'd be pissed. At least that snow is still working for our benefit tn Link to comment Share on other sites More sharing options...
yoda Posted January 21 Share Posted January 21 BWI 16 DCA 19 IAD 14 9pm temps Link to comment Share on other sites More sharing options...
mattie g Posted January 21 Share Posted January 21 On 1/21/2025 at 1:08 AM, TSSN+ said: Where the snow cover is. Colder Expand On 1/21/2025 at 1:09 AM, snowfan said: That’s long wave infrared and the darker colors = colder surfaces resulting from the deeper snowfall. Expand Interesting. We’ve still got up to 3” of glacier in many spots (plus a little fluff on top), so i wouldn’t have thought it’s just about who got snow yesterday. Link to comment Share on other sites More sharing options...
wxmeddler Posted January 21 Share Posted January 21 On 1/21/2025 at 2:13 AM, mattie g said: Interesting. We’ve still got up to 3” of glacier in many spots (plus a little fluff on top), so i wouldn’t have thought it’s just about who got snow yesterday. Expand Fresh (ie. still fluffy) snow is way more effective at longwave radiation emission than hardpack snow. 1 1 Link to comment Share on other sites More sharing options...
LordBaltimore Posted January 21 Share Posted January 21 On 1/21/2025 at 2:13 AM, mattie g said: Interesting. We’ve still got up to 3” of glacier in many spots (plus a little fluff on top), so i wouldn’t have thought it’s just about who got snow yesterday. Expand lots of subtleties with snowcover. New snowpack is highly insulating because of air pockets, which means lower skin temps than old snowpack due to less heat draw from the soil. Older snowpack is radiatively similar to wet soil but with higher albedo. 1 Link to comment Share on other sites More sharing options...
wxdude64 Posted January 21 Share Posted January 21 Down into single digits, currently 9.0/-6.1 at 9:15 pm. Link to comment Share on other sites More sharing options...
pazzo83 Posted January 21 Share Posted January 21 Seeing some PWS in WV (Canaan area) showing -10s. Proper cold. 1 Link to comment Share on other sites More sharing options...
wxdude64 Posted January 21 Share Posted January 21 On 1/21/2025 at 2:31 AM, pazzo83 said: Seeing some PWS in WV (Canaan area) showing -10s. Proper cold. Expand Canaan Valley NWR currently -5/-7, which is up a bit from two hours ago at -7/-9. 1 Link to comment Share on other sites More sharing options...
Eskimo Joe Posted January 21 Share Posted January 21 5 Link to comment Share on other sites More sharing options...
hstorm Posted January 21 Share Posted January 21 13.4 at 10pm Link to comment Share on other sites More sharing options...
mattie g Posted January 21 Share Posted January 21 On 1/21/2025 at 2:17 AM, wxmeddler said: Fresh (ie. still fluffy) snow is way more effective at longwave radiation emission than hardpack snow. Expand On 1/21/2025 at 2:19 AM, LordBaltimore said: lots of subtleties with snowcover. New snowpack is highly insulating because of air pockets, which means lower skin temps than old snowpack due to less heat draw from the soil. Older snowpack is radiatively similar to wet soil but with higher albedo. Expand Interesting stuff. Thanks, folks! 1 Link to comment Share on other sites More sharing options...
DDweatherman Posted January 21 Share Posted January 21 On 1/21/2025 at 2:37 AM, Eskimo Joe said: Expand Maybe it was mesonet too that I was looking at. Are they all at airports and public spaces? Link to comment Share on other sites More sharing options...
nukeing Posted January 21 Share Posted January 21 7/0.2Perfect for chilling beer in the deck snowpackSent from my Pixel 9 Pro XL using Tapatalk Link to comment Share on other sites More sharing options...
Another Field Posted January 21 Share Posted January 21 Metro Baltimore 1 Link to comment Share on other sites More sharing options...
T. August Posted January 21 Share Posted January 21 13.8/0.6° - dropping about 1 degree per hour. Link to comment Share on other sites More sharing options...
CAPE Posted January 21 Share Posted January 21 12 here at 1020 pm Bedtime Link to comment Share on other sites More sharing options...
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