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ACUS11 KWNS 201056
SWOMCD
SPC MCD 201055
PAZ000-MDZ000-VAZ000-WVZ000-201700-

Mesoscale Discussion 0113
NWS Storm Prediction Center Norman OK
0455 AM CST Wed Feb 20 2019

Areas affected...Northern Virginia and West Virginia...western
Maryland...much of south-central Pennsylvania

Concerning...Heavy snow

Valid 201055Z - 201700Z

SUMMARY...Snow rates are expected to increase into the 1-2"/hr range
through mid-morning with an eventual changeover to sleet from south
to north.

DISCUSSION...Southwesterly flow aloft continues to moisten profiles
this morning with a broad area of lift and precipitation extending
from the OH Valley to the East Coast. Most of the precipitation is
snow across the MCD area, but rain exists across central WV where
warm advection in the 850-700 mb layer is strongest. Snow should
remain the dominant precipitation type across the MCD area due to a
surface ridge and cooler temperatures, but a warm nose aloft will
eventually lead to snow changing to sleet from south to north later
today. Until then, snow rates are expected to increase to over
1"/hr, possibly up to 2"/hr at times from far northern VA/WV into
south-central PA.

..Jewell.. 02/20/2019

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

ATTN...WFO...CTP...LWX...PBZ...RLX...

LAT...LON 38877746 38747790 38657847 38697950 38847974 39187967
39407993 39797979 40367942 40737853 40837759 40627705
40207684 39797700 39237723 38877746



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