Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
251 AM EST Thu Feb 20 2020
Valid 12Z Thu Feb 20 2020 - 12Z Sat Feb 22 2020
...Snow for the Carolinas and lake effect snow down wind from the Great
...Additional rain likely across flooded regions of the South through
...Temperatures will be 10 to 25 degrees below average over the
Upper/Middle Mississippi Valley, Southern Plains, and parts of the
Northern/Central Rockies into the Southeast...
Up to 1.5 inches of additional rain will fall over parts of the Lower
Mississippi Valley to the Southeast mainly on Thursday. Overrunning
moisture and upper-level energy will aid in producing rain over areas hit
by Heavy rain during the last 14 days. The WPC has issued a marginal risk
of excessive rainfall over this area. Flash flood watches are up over
this area. The marginal risk means isolated flash flooding is possible.
Meanwhile, a cold dome of Arctic high pressure pushing down across the
Rockies and Plains will spread east-southeastward over the Lower
Mississippi Valley to the Ohio Valley and the Southeast. This high will
keep temperatures 10 to 25 degrees below average for this part of the
country. The cold air will support accumulating snow on Thursday evening
into Friday evening over the Southern Appalachians, eastward across much
of North Carolina, Northern South Carolina and Southern Virginia where
locally several inches of snow are expected. In addition, with the cold
air flowing over the Great Lakes, lake effect snow will develop on Friday.
The heaviest snow will be down wind from Lakes Ontario and Erie.
Elsewhere, dry weather will persist across much of Western U.S. from the
West Coast into the Great Basin and the Northern Rockies. However, there
will be a weak area of low pressure coming into the Southwest by Saturday
which will bring some clouds and showers along with temperatures trending
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php