Prognostic Meteorological Discussion
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000
FXUS01 KWBC 200759
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
259 AM EST Tue Feb 20 2018

Valid 12Z Tue Feb 20 2018 - 12Z Thu Feb 22 2018

...Heavy snow likely over the Northern Plains and Upper
Mississippi Valley...

...Heavy rain and flooding possible for portions of the Southern
Plains to the Western Ohio Valley and into the Lower Great Lakes...

...Rain/freezing rain possible from of the Middle/Upper
Mississippi Valley into the Upper Great Lakes...

...Temperatures will be 15 to 35 degrees below average over the
Northern Rockies into parts of the Northern/Central Plains...

Over the next couple of days a quasi-stationary front over the
central U.S. will bring widespread rain and thunderstorms from the
Southern Plains to the Great Lakes/Ohio Valley and east; with
heavy snow across the Northern Plains and Upper Mississippi
Valley. A narrow transition zone will setup across the Middle and
Upper Mississippi Valley toward the Great Lakes where freezing
rain will be possible. Winter Weather Advisories are in effect
from Nebraska to the Dakotas and east to northern Michigan.
Northwest Nebraska to central South Dakota have Winter Storm
Warnings in effect.

Flash Flood Watches, Flood Warnings and Advisories are in effect
from northeast Texas to the southern Missouri and for the Lower
Great Lakes region. Several inches of rain is expected along the
stalled front over a lengthy time frame- likely continuing into
the weekend. Run off from the abundant rain will cause local
creeks and streams to rise which may lead to rivers to swell or
overflow their banks. Urban flooding may also occur due to the
excessive rainfall.

Upper-level energy just off the Pacific Northwest Coast will move
southward to off the Central/Southern California Coast by
Wednesday.  Additional upper-level energy will move over the
Pacific Northwest on Tuesday evening into Wednesday  spreading.
snow to parts of the Pacific Northwest Coast on Tuesday afternoon
that will change over to rain along the Northwest and Northern
California Coast by Tuesday evening.  The snow will continue just
inland over parts of the Northwest into Northern California
through Wednesday.

Campbell


Graphics available at
www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
$$





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