The Weather Prediction Center

Short Range Forecast Discussion

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Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
316 AM EDT Fri Oct 31 2014

Valid 12Z Fri Oct 31 2014 - 12Z Sun Nov 2 2014

***Major trough setting up over the Eastern U.S.***

***Drought relief on the way for California***

***Arctic surface high settles southward into U.S.***

The weather pattern will get interesting as we head into the
weekend as a Manitoba mauler (a low pressure system coming from
the Canadian province of Manitoba) dives southward towards the
southern Appalachians by Saturday morning.  This will result in
the development of a highly amplified trough over the East Coast
and a strong surface low developing offshore.  In terms of
sensible weather impacts, expect much colder weather by Saturday
with numerous showers, and accumulating snow in the higher
elevations of the Appalachians.  Rain and windy conditions are
likely for eastern New England by Sunday as the offshore low

Across the western U.S., good news is in the forecast for much of
California as a more southern storm track brings badly needed rain
to drought-stricken areas.  The rain will come courtesy of a
Pacific cold front.  A period of steady rainfall along with
isolated thunderstorms is likely for central and northern
California on Friday.  Snow is expected for the highest elevations
of the Sierra Nevada, where winter storm warnings are currently in
effect.  Widespread rain and snow showers are in the forecast for
the Intermountain West this weekend as the front and trough axis
move inland.

Elsewhere across the country, a large surface high from Canada
will dominate the weather pattern from the Upper Midwest to the
Deep South this weekend.  Widespread freeze warnings are currently
in effect from the central Plains to the Ohio Valley, where
overnight lows in the 20s to low 30s are expected.  It will also
be unseasonably cool across the Deep South with lows in the 30s
and highs in the 50s and 60s under mostly sunny skies.


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Last Updated: 316 AM EDT Fri Oct 31 2014