Area Forecast Discussion
Issued by NWS Knoxville/Tri Cities, TN

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000 FXUS64 KMRX 201520 AAA AFDMRX Area Forecast Discussion...UPDATED National Weather Service Morristown TN 1120 AM EDT Wed Sep 20 2017 .DISCUSSION...
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Showers are already developing just outside our area in SW VA and srn WV, associated with an upper level low that will be drifting SE through the day. The 12Z OHX sounding does not look promising for much convection to develop with an inversion just above 850 mb, but the 12Z RNK sounding appears more favorable with greater moisture depth. Latest rapid update models show isolated coverage of showers in SW VA and NE TN this afternoon, but less than the current forecast PoPs would suggest. The update will lower PoPs to a slight chance in that area, while maintaining the slight chance mention in the Plateau. Temperatures have been slow to rise due to valley fog this morning, which will require some adjustments to hourly temp grids, but forecast high temps in the 80s across the Valley appear on the right track.
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&& .MRX WATCHES/WARNINGS/ADVISORIES... NC...None. TN...None. VA...None. && $$ DGS

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