Prognostic Meteorological Discussion
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FXUS01 KWBC 241719

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
1219 PM EST Sat Feb 24 2018

Valid 00Z Sun Feb 25 2018 - 00Z Tue Feb 27 2018

...Flash Flooding is likely from the southern Plains into the Ohio
Valley today and tonight...

...Enhanced risk of severe thunderstorms/tornadoes over parts of
the Lower Mississippi and Lower Ohio Valleys...

...Heavy snow over the Cascades and Northern Rockies...

...Heavy snow for Upper Mississippi Valley/Upper Great Lakes...

Cold air aloft associated with an upper level disturbances and
onshore flow will lead to a wet regime across the Northwest, with
coastal rain and higher elevation snow through Sunday night
associated with a pair of frontal zones at the trough`s leading
edge.  Northern California and the Central Rockies will be greeted
by lower elevation rain/higher elevation and interior snow
intermittently into Monday.

A wave of low pressure over the Southern Plains will deepen
rapidly and occlude while moving through the Great Lakes Sunday
morning.  The system will produce snow -- heavy at times -- to the
left of its track over parts of the Northern Plains, the Upper
Midwest, and Upper Peninsula of Michigan by Saturday night,
clearing the Great Lakes by Sunday evening.  Closer to its cold
and warm fronts, showers and thunderstorms with a high risk of
flash flooding over parts of the Lower/Middle Mississippi Valley
into parts of the Ohio Valley by Saturday evening.  Per the Storm
Prediction Center, some thunderstorms in may be severe (including
tornadoes) today and tonight across portions of the Mississippi
Valley, Ohio Valley, and Tennessee.  Showers and thunderstorms
linger across the Western/Central Gulf Coast into Sunday night as
the cold front stalls and weak waves ripple along the boundary.

Precipitation then moves eastward into a more stable airmass as an
area of rain into the Southern Mid-Atlantic/Southeast Sunday
afternoon and evening and the Northeast on Sunday.  Snow is
expected across Northern New England.  Areas of freezing rain are
also possible in New England.


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