Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
306 AM EST Thu Jan 17 2019
Valid 12Z Thu Jan 17 2019 - 12Z Sat Jan 19 2019
...Major winter storm continues across the western U.S. and then reaches
the Plains by Friday...
A severe winter storm has been hammering California Wednesday night, and
very heavy snow is expected to continue for the Sierra Nevada and also the
mountains of northern California. Blizzard warnings are in effect through
Thursday morning for the highest elevations, with snowfall amounts in
excess of three feet expected! In addition to the heavy snow, heavy rain
will also fall across the lower elevations, with most of it happening
through Thursday evening. A moderate risk of rainfall has been issued for
a small area in southern California, particularly where the burn scars
exist in the Los Angeles region. Precipitation will begin to wind down by
Thursday night and into Friday morning as the frontal system progresses
farther inland across the Intermountain West.
The upper level trough responsible for the ongoing storm over the western
U.S. will generate a new surface low over the western High Plains by
Friday morning and this will be the next big feature to monitor going into
the upcoming weekend. Freezing rain, heavy snow, and heavy rain are
expected in association with the storm system through the central and
eastern U.S. over the next few days. Some thunderstorms will also be
possibe across the Gulf Coast region. Heavy snow will begin by Friday
evening over the central plains and then progress eastward by the weekend.
Consult the WPC winter weather products and discussion for more
information on this system. In the wake of the storm, an arctic surface
high will plunge southward from Canada and result in frigid temperatures
across the Plains and the Upper Midwest, with temperature departures on
the order of 15 to 25 degrees below normal!
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php