SPC MD 111

MD 0111 CONCERNING HEAVY SNOW FOR EASTERN WV...WESTERN VA

Mesoscale Discussion 0111
NWS Storm Prediction Center Norman OK
1126 PM CST Tue Feb 19 2019

Areas affected...Eastern WV...Western VA

Concerning...Heavy snow 

Valid 200526Z - 200930Z

SUMMARY...Heavy snow is expected to spread northeast along the WV/VA
border over the next several hours. Snow rates will likely approach
1" per hour before precipitation changes to sleet.

DISCUSSION...Strong low-level warm advection appears to be the
primary contributor in a large canopy of precipitation that has
developed across the OH Valley into the central Appalachians late
this evening. LLJ is currently focused over TN but will strengthen
and translate across KY into WV by sunrise. Large-scale forcing for
ascent is expected to increase downstream across WV into western VA
over the next few hours and this is reflected well in an expansive
precip shield now spreading east of the higher terrain. Leading edge
of this activity will fall as snow with rates likely
approaching/exceeding 1" per hour. Forecast soundings for this
region suggest substantial warming will switch snow to sleet across
the southwestern half of the MCD area by 09z while the eastern WV
Panhandle and northwestern VA should remain as snow through 12z.

..Darrow.. 02/20/2019

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...LWX...RNK...PBZ...RLX...

LAT...LON   36898138 37448128 38098063 38978030 39187944 38537859
            37087919 36558065 36898138 

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from SPC Forecast Products http://www.spc.noaa.gov/products/md/md0111.html