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The Monday wintry event potential (12/8/25)


GaWx
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This has been a rather tough forecast, mainly due to the fact that this will be developing directly overhead. However, it's hard to ignore model trends across southern Virginia and the NC mtns. I am now beginning to wonder if this will just begin as snow for most, considering the current observations are running a bit colder than what guidance has been showing. If it does begin as snow, I expect some of the higher totals to verify. One thing I have noticed is somewhere across central/southern VA, some mesoscale banding will likely produce some efficient snowfall rates. This is noted in a band of stronger FGEN running west to east as pictured below. Rates within this zone will likely see 1in/hr at times.

 

NBM probabilistic guidance supports this with an area of higher probabilities across southern VA/NW NC. 

Based on 01z NBM of 24hr snowfall greater than 4.0 inches is now at:

DAN: 60%

ROA: 80%

LYH: 80%

TNB: 70%

A very sharp drop in probabilities occur along and south of the VA/NC border. However, probabilities for at least 1.0 inch is around:

GSO: 60%

RAH: 40% 

 

namconus_temp_adv_fgen_700_neus_1.png

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The snow hits behind the front so what is happening ahead of it is not as important. Most areas probably will start as some rain before changing over. The previous event was WAA this one is more anafrontal with cold air feeding in (Cold Air Advection).

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