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FXUS01 KWBC 310648
Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
247 AM EDT Sat Oct 31 2020

Valid 12Z Sat Oct 31 2020 - 12Z Mon Nov 02 2020

...Cold air will be the main theme across much of the Eastern half
of the US this weekend, with generally very warm and dry weather
across the West and Southwest...

...Light Rain changing to lake enhanced snow showers across the
Great Lakes into Northeast Sunday into Monday...

A dome of high pressure and associated push of seasonally cold air
across the northern Appalachians into the East Coast today.  Frost
and Freeze watches and warnings are in effect across the Ohio and
northern Tennessee Valley stretching over to the Mid-Atlantic for
this morning.  The cold air will remain in place with daytime
highs 10 to 20 degrees below average Saturday.

A strong Pacific low has moved into the southern Canadian
Prairies.  The strong pressure gradient is leading to strong winds
across the High Plains and into the Dakotas today with wind
advisories and a few high wind warnings in effect.   This storm
will continue to progress quickly north of the Great Lakes but
will bring some increased chances of light showers late Saturday
into Sunday, before a reinforcing cold Canadian airmass drives
through dropping the temperatures below average again into
Sunday/Monday.  This cold air should help to turn some showers
into snow but also help to activate Lake-Effect snow in the
traditional belts downstream of the warmer lakes.  This shot of
cold air will lead to 15-20 degrees below average temps across the
Midwest bleeding into the Southern Plains and Lower Mississippi
valley behind the cold front, though should generally dry away
from the Great Lakes and south of the Ohio River.  By Monday,
return moisture flow off the Atlantic ahead of the cold front
should increase the chance for showers particularly closer to the
coast and into New England.

Further south, persistent onshore flow in the vicinity of a
stationary front across South Florida will keep continued chance
for heavy rainfall producing thunderstorms.  They will be
scattered in nature but may produce some isolated localized
flooding concerns as the Weather Prediction Center continues to
maintain a Marginal Risk of Excessive Rainfall for this area.

Elsewhere, it is fairly status quo across the Western US.  The
moisture stream continues to be well north and so sunny skies and
dry conditions will continue the drought.  Temperatures should not
be extreme, but 10 to 15 degrees above average.


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