Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
314 PM EST Fri Dec 07 2018
Valid 00Z Sat Dec 08 2018 - 00Z Mon Dec 10 2018
...Winter storm to bring ice and snow from the southern Plains to the
Appalachians, and heavy rain from eastern Texas to Georgia...
An upper level system is forecast to move east across the southwestern
U.S. Friday night, producing a wintry mix of snow and ice from New Mexico
into northwest Texas and Oklahoma later this evening. Greatest snowfall
accumulations through early Saturday are expected to center across the
West Texas South Plains, where local totals of 3-4 inches are forecast.
Mixed precipitation will also be possible further east into northern
Arkansas, including the Ozark region, where some higher accumulations are
also possible. Then as the upper system continues to move east and an
organizing surface low begins to track along the coast, snow will begin to
develop across the southern and central Appalachians on Saturday. As
southerly winds ahead of the low increase, drawing ample moisture up from
the Gulf, cold high pressure is forecast to remain in place over the
Mid-Atlantic - setting the stage for a significant winter storm with
considerable snow accumulations for the southern and central Appalachians
through Sunday. Snowfall amounts in these areas could exceed a foot -
resulting in hazardous travel conditions, downed trees and power outages.
A wintry mix is expected further east for the Piedmont areas of the
Carolinas and southern Virginia, where wet snow and freezing rain may also
disrupt travel and contribute to power outages.
Meanwhile, this system is expected to produce heavy rain for areas further
to the south, particularly from eastern Texas into the lower Mississippi
valley. These rains may result in rapid stream rises and flooding as
indicated by the WPC Excessive Rainfall Outlook, which shows Slight to
Moderate Risk for these areas into early Saturday. Saturday into early
Sunday, this heavy rain threat is expected to shift further east along the
central Gulf Coast into the Southeast.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php