Prognostic Meteorological Discussion
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FXUS01 KWBC 200813

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
413 AM EDT Fri Apr 20 2018

Valid 12Z Fri Apr 20 2018 - 12Z Sun Apr 22 2018

...Heavy rain possible over parts of the Lower Mississippi Valley
into parts of the Southern Plains...

...Heavy snow possible over parts of the Central Rockies...

A storm over the Central/Southern Rockies will slowly move to the
Southern High Plains by Saturday evening.  The system will produce
lower elevation rain and snow over parts of the Central
Rockies/Great Basin that will slowly taper off by Saturday
evening.  Showers and thunderstorms will develop over parts of the
Southern High Plains that will move eastward to the Southern
Plains by Saturday morning moving into the Lower Mississippi
Valley by Sunday morning.  Rain will begin to develop over parts
of the Central High Plains on Friday morning that will expand into
parts of the Middle Mississippi Valley by Saturday morning into

Meanwhile, a front over the Eastern Pacific will move onshore over
the Pacific Northwest early on Saturday morning moving inland to
the Northern High Plains/Northern Intermountain Region by Saturday
evening.  Overnight Friday, rain and higher elevation snow will
develop over parts of the Pacific Northwest moving into parts of
the Northern Intermountain Region by Saturday morning.  The rain
will change over to snow over parts of the Northern Rockies by
Saturday evening.  The rain and snow will taper off over the
Pacific Northwest into the Northern Rockies overnight Saturday.
Elsewhere, an upper-level low over the Northeast and Southeastern
Canada will aid in producing light snow over Northern New England
through Saturday morning when the upper-level low moves to the
eastern tip of Canada.


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