Prognostic Meteorological Discussion
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000
FXUS01 KWBC 192046
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
346 PM EST Mon Feb 19 2018

Valid 00Z Tue Feb 20 2018 - 00Z Thu Feb 22 2018

...Heavy snow possible over parts of the Northern Plains...

...Heavy rain 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...

A quasi-stationary front extending from the Great Lakes to the
Middle Mississippi Valley/Central Rockies will slowly begin to
move eastward overnight Tuesday to the Lower Great Lakes to the
Southern Plains by Wednesday.  The system will produce snow over
parts of the Upper Great Lakes southwestward into the Northern
Plains by Monday evening.  Upper-level energy over the
Northern/Central Rockies will move northeastward into the Upper
Great Lakes by Wednesday.  The energy will produce additional snow
over parts of the Northern/Central High Plains overnight Monday
moving to the Upper Mississippi Valley and parts of the
Northern/Central Plains by Tuesday morning while snow continues
over the Upper Great Lakes.  The snow will end over the
Northern/Central Plains on Tuesday afternoon while ending over the
Upper Great Lakes/Upper Mississippi Valley overnight Tuesday.

Additionally, showers and thunderstorms will develop over parts of
the Southern Plains into Middle Mississippi Valley/Ohio Valley
that will continue over the region through Tuesday afternoon when
the area of showers and thunderstorms moves slightly eastward to
the Ohio Valley southwestward to the Southern Plains/Western Gulf
Coast by Wednesday.  Showers and thunderstorms will also develop
over parts of the Tennessee Valley Tuesday afternoon into
Wednesday.  In addition, rain will develop over parts of the Great
Lakes extending into the Eastern Ohio Valley into parts of the
Northeast with an area of rain/freezing rain developing over
Northern Maine on Monday evening continuing through Wednesday
morning.  Elsewhere along the rain/snow line, a band of
rain/freezing rain will develop over parts of the Middle
Mississippi Valley into parts of the Upper Great Lakes on Monday
evening.  The band of rain/freezing rain will expand southwestward
over parts of the Central Plains overnight Monday.  On Tuesday
into Wednesday morning, the band of rain/freezing rain will move
eastward extending from parts of the Great Lakes to the Middle
Mississippi Valley by Monday.

Meanwhile, upper-level energy over the Southwest into Central High
Plains will move northeastward to the Upper Great Lakes to the
Central Plains by Wednesday.  The energy will produce snow from
parts of the Pacific Northwest and Northern/Central California
eastward to parts of the Northern/Central High Plains southward to
parts of the Southwest and Central/Southern Rockies on Monday
evening along with rain at lower elevations of the
Southwest/Southern Rockies.  Overnight Monday, the snow will wane
over the Pacific Northwest/California and parts of the Great
Basin/Southwest.  The snow over the Rockies ends overnight
Tuesday.

Another region of upper-level energy just off the Pacific
Northwest Coast on Tuesday morning 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.  Snow will develop over 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.

Ziegenfelder


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




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