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2/19-20 Winter Storm Observations


nj2va
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Just now, snjókoma said:

If the HRRR is right (I don't think it will be) and DC gets 1" of snow... Closing the night before would be embarrassing. 

There will be icing concerns as well. Not sure why there are folks out there that are just monitoring the snow aspect. 

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14 minutes ago, poolz1 said:

What site was that radar from?  Looks like CMISS but I cant find it....COD loops are stuck at 5pm....  

I pull a lot of stuff out of a storm tracking thread in the NY subforum. It used to have a bunch more stuff in it. Has been my goto for the past 5 years :)

https://www.americanwx.com/bb/topic/42006-storm-tracking-images/

 

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3 minutes ago, Ji said:
7 minutes ago, snjókoma said:
If the HRRR is right (I don't think it will be) and DC gets 1" of snow... Closing the night before would be embarrassing. 

What...it looked great an hour ago

It feels like the HRRR provides all the NAM’s consecutive thrills of victory and agonies of defeat, just on an hourly basis.

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Just now, Weather Will said:

OPM has a new policy.  Federal employees no longer get snow days or weather and safety leave as it is now called.  We must either take personal leave or telework.  

Makes complete sense since the Fed has made considerable investment in a mobile-enabled workforce. 

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Updated AFD from LWX as of 8:57pm:

.NEAR TERM /THROUGH WEDNESDAY/... Leading edge of precipitation is moving northward into southern Virginia as of mid-evening, and should arrive just prior to midnight across central Virginia. Precipitation will then move towards the remainder of the area from southwest to northeast overnight. A strong area of frontogenetical forcing will move across the area, and a band of moderate to heavy snow is expected across the area Wednesday morning. Localized rates of 1"+ per hour are possible in this band. Latest guidance and trends suggest the strongest lift in the dendritic snow growth zone will setup over eastern West Virginia, the northern Shenandoah Valley into west-central Maryland Wednesday morning, where 2" per hour snowfall rates are possible. At any given location, a 4-6 hour period of snow is expected before the strong warm air advection pulls in a warm nose aloft causing snow to mix with and change over to sleet during the mid to late morning hours Wednesday for most locations, and early afternoon across northeastern Maryland. An extended period of sleet then appears likely for a good portfrontogenetical forcing will move across the area, and a band of moderate to heavy snow is expected across the area Wednesday morning. Localized rates of 1"+ per hour are possible in this band. Latest guidance and trends suggest the strongest lift in the dendritic snow growth zone will setup over eastern West Virginia, the northern Shenandoah Valley into west-central Maryland Wednesday morning, where 2" per hour snowfall rates are possibleion of the area before warming continues, changing precipitation to freezing rain and then rain. Freezing rain will persist the longest for portions of eastern WV, western MD, and northwestern VA near/west of the Blue Ridge. Of note, even an hour sooner (or later) in changeover from snow to ice could result in notably lower (or higher) snowfall amounts, given the moderately heavy rates expected. Snow and sleet totals from 3-6" appear most probable for locations along/west of I-95, with some areas in excess of 6" near/west of the Blue Ridge and northern MD. 2-4" of snow/sleet likely for areas south/east of I-95. This will then be followed by a light glaze of ice accrual along/east of I-95 with a tenth to two-tenths west of the I-95 corridor. Some locations may see up to three-tenths in the favored locations west of the Blue Ridge. The combined impact of the snow, sleet and freezing rain will create very hazardous travel conditions, and could result in downed trees and isolated power outages even in the absence of strong winds (northeast 10-15 mph, with a few gusts to around 20 mph).

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