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