Ian Posted January 7, 2015 Share Posted January 7, 2015 I would think strong CAA westerly winds would mitigate the UHI somewhat, but I'm sure DCA will be the warm spot. Actually did a small study a few years ago of whether wind could mitigate the UHI for DC. Didn't find anything conclusive, unfortunately. Yeah I'd think it won't be as big as a calm night. MOS is pretty low.. could flirt with single digits but maybe just above. Link to comment Share on other sites More sharing options...
Kay Posted January 7, 2015 Share Posted January 7, 2015 My 2.25" snow is drifting admirably. Link to comment Share on other sites More sharing options...
H2O Posted January 7, 2015 Share Posted January 7, 2015 mega flizzard now in Merrifield Link to comment Share on other sites More sharing options...
CAPE Posted January 7, 2015 Share Posted January 7, 2015 HRRR has 4 at DCA at 2a. I'll probably take the over. HRRR had 12 for me last night. Mount Holly forecasted low was 18. I hit 13 before temps rose to about 20 during the early morning. Link to comment Share on other sites More sharing options...
87storms Posted January 7, 2015 Share Posted January 7, 2015 national radar shows a quiet day for the most part: http://radar.weather.gov/Conus/index_loop.php full res: http://radar.weather.gov/Conus/full_loop.php Link to comment Share on other sites More sharing options...
gymengineer Posted January 7, 2015 Share Posted January 7, 2015 I would think strong CAA westerly winds would mitigate the UHI somewhat, but I'm sure DCA will be the warm spot. Actually did a small study a few years ago of whether wind could mitigate the UHI for DC. Didn't find anything conclusive, unfortunately. The sterling example of CAA trumping everything is 1/19/94- Hi/Lo's for each airport: DCA: 8/-4 IAD: 6/-6 BWI: 5/-5 Link to comment Share on other sites More sharing options...
CAPE Posted January 7, 2015 Share Posted January 7, 2015 HRRR says beware the mega long Lake Huron snow streamer. Link to comment Share on other sites More sharing options...
RDM Posted January 7, 2015 Share Posted January 7, 2015 Temps still dropping steady, DPs too. 19/7 now - down 2 on both in the last hour. Seems each cloud and wind surge that comes through drops things a little more. Must be a fun day up on the Allegheny Plateau. Looks like we have a decent chance of beating tonight's forecast low of 7. Looking at NOAA's site nearly the entire eastern half of the country is under a wind chill advisory and/or some other kind of cold weather alert. Don't recall such a wide spread cold in recent memory, impressive. Link to comment Share on other sites More sharing options...
Ian Posted January 7, 2015 Share Posted January 7, 2015 HRRR had 12 for me last night. Mount Holly forecasted low was 18. I hit 13 before temps rose to about 20 during the early morning. it might not be super far off but it has widespread near 0 temps by 2 which seems too cold. definitely wrong at DCA. Link to comment Share on other sites More sharing options...
CAPE Posted January 7, 2015 Share Posted January 7, 2015 it might not be super far off but it has widespread near 0 temps by 2 which seems too cold. definitely wrong at DCA. Yeah not likely esp with wind. Last night was a radiational cooling deal with snow pack and zero wind. Link to comment Share on other sites More sharing options...
clueless Posted January 7, 2015 Share Posted January 7, 2015 19 here and filtered sun. Link to comment Share on other sites More sharing options...
CentredMan Posted January 7, 2015 Share Posted January 7, 2015 Snow flurries in Centreville. Link to comment Share on other sites More sharing options...
shoshanaz Posted January 7, 2015 Share Posted January 7, 2015 There's flurries in the Greenspring/Pikesville area right now. 23F with wind. Link to comment Share on other sites More sharing options...
das Posted January 7, 2015 Share Posted January 7, 2015 I noticed last night when I shoveled, the snow on on the grass was melting where it meets the sidewalk indicating the ground was still warm it wasn't well below freezing long enough for the ground to freeze, even the top layer That's surprising. In Clarksburg, the ground was frozen from last week down maybe 2". When the rain hit over the weekend, it melted the top inch or so and the warm day on Sunday melted the ground where there was direct sunlight. Anywhere that was partially or fully shaded stayed frozen that inch down so went the temps fell Monday night. only the top inch had to freeze which it did quickly since it was cold on top and from below. By 9pm Monday night, everything was frozen solid again so I could walk in even the boggiest parts of my yard. Link to comment Share on other sites More sharing options...
wdcrob Posted January 7, 2015 Share Posted January 7, 2015 It is snowing IMBY (W Springfield). Light snow -- def heavier than flurries. Link to comment Share on other sites More sharing options...
PWC Split Posted January 7, 2015 Share Posted January 7, 2015 Pretty solid burst of snow for the last 5 minutes in Haymarket. 15 degrees Link to comment Share on other sites More sharing options...
mitchnick Posted January 7, 2015 Share Posted January 7, 2015 that band that went through State College earlier is heading south through PA Baltimore and north look to be on the edge if current trajectory holds, and assuming the band holds together...it's a good one though http://radar.weather.gov/radar.php?rid=CCX&product=N0R&overlay=11101111&loop=yes Link to comment Share on other sites More sharing options...
Scarlet Pimpernel Posted January 7, 2015 Share Posted January 7, 2015 The sterling example of CAA trumping everything is 1/19/94- Hi/Lo's for each airport: DCA: 8/-4 IAD: 6/-6 BWI: 5/-5 When I first read this quickly, I thought you were referring to LWX ("sterling")!! Those are some *cold* temps for here! Same weekend there was record to near record cold over much of the eastern U.S. It got down to the -20s in Ohio then, I recall, after a nice 6-8" snow event. Some interesting streamers on radar, and it's looked dark to the north of me for some time. Got a few flurries earlier but generally has been partly cloudy and breezy. Maybe an occasional flake since then. That wind is d*mn chilly! Link to comment Share on other sites More sharing options...
mitchnick Posted January 7, 2015 Share Posted January 7, 2015 if you zoom, you get a lot more stations http://www.wrh.noaa.gov/mesowest/gmap.php?zoom=7&extents=36.922526,-80.150879,41.972097,-79.732227&density=1 12 degrees right now at Camp David! Link to comment Share on other sites More sharing options...
HighStakes Posted January 7, 2015 Share Posted January 7, 2015 that band that went through State College earlier is heading south through PA Baltimore and north look to be on the edge if current trajectory holds, and assuming the band holds together...it's a good one though http://radar.weather.gov/radar.php?rid=CCX&product=N0R&overlay=11101111&loop=yes Been watching it since it originate in central New York this morning. Link to comment Share on other sites More sharing options...
mitchnick Posted January 7, 2015 Share Posted January 7, 2015 Been watching it since it originate in central New York this morning. you're in the perfect spot and could get 1/2-1" out of it with your elevation Link to comment Share on other sites More sharing options...
84 Hour NAM Posted January 7, 2015 Share Posted January 7, 2015 HRRR says beware the mega long Lake Huron snow streamer. hrrr.png Nice sound-effect snow for Cape Hatteras Link to comment Share on other sites More sharing options...
NoVaWx Posted January 7, 2015 Share Posted January 7, 2015 There's a spot near Dulles where every time I've drove through the toll road it's snowing pretty hard. Kind of like driving to western md you enter a fog of snow. Link to comment Share on other sites More sharing options...
snowfan Posted January 7, 2015 Share Posted January 7, 2015 0 at Canaan with winds gusting to 24. Nice day. Link to comment Share on other sites More sharing options...
snowfan Posted January 7, 2015 Share Posted January 7, 2015 with the fresh snow and frigid temps, great falls should look pretty sweet right about now. Link to comment Share on other sites More sharing options...
HighStakes Posted January 7, 2015 Share Posted January 7, 2015 you're in the perfect spot and could get 1/2-1" out of it with your elevation You may remember early February 2009 during the inverted trough that gave parts of southeastern PA 8 inches while areas a few miles away got nothing. That same night a line of snow showers developed in PA and dropped into the area and actually strengthened when it got to northern MD. Manchester got 3-4 inches. I missed it because I still lived in Reisterstown and my house here was being built. I was here the next day to meet with the builder and couldn't believe the snow cover. Strange thing about that night was the line of snowshowers made it all the way to PG county. LWX started issuing SWS and even WWA's for parts of the area after they got reports of what was happening in northern MD. By the time the snow showers reached Reisterstown they lost all their punch and I only got a dusting despite the WWA for 1-2. Then they began to fire up again as they moved south towards the beltway and maybe even your area where they produced an inch or so. Another example of something similar where the Manchester area got their own private snowstorm was on Saturday of Valentine's Day weekend in 2012. A cold front came through late that afternoon with a squall line of snow that fizzled as it got east of Hagerstown. We got about a 10 minute heavy snow shower. Then later that evening as the flow turned to the NW some snow showers developed in PA and dropped into northern MD and again they strengthened when they got here. We ended up with 2-3 inches in a 3-4 hour period. It was the best event of that year. Unlike the 2009 situation nobody south of Hampstead even saw a flurry. Link to comment Share on other sites More sharing options...
MN Transplant Posted January 7, 2015 Share Posted January 7, 2015 Into the teens. I normally defend DCA, but their reading is pretty obnoxious right now. Link to comment Share on other sites More sharing options...
T. August Posted January 7, 2015 Share Posted January 7, 2015 Into the teens. I normally defend DCA, but their reading is pretty obnoxious right now. I'm the new DCA. 22F up here. Link to comment Share on other sites More sharing options...
MN Transplant Posted January 7, 2015 Share Posted January 7, 2015 I'm the new DCA. 22F up here. The 4pm DCA ob was a bit better at 24°. Still, NW flow with fresh snow and it is reading the same as Ocean City, while Andrews, BWI and IAD are all around 20. Now I sound like Tenman. Link to comment Share on other sites More sharing options...
NorthArlington101 Posted January 7, 2015 Share Posted January 7, 2015 -SN in this flurry. Link to comment Share on other sites More sharing options...
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