Prognostic Meteorological Discussion
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000
FXUS01 KWBC 260755
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
354 AM EDT Thu Apr 26 2018

Valid 12Z Thu Apr 26 2018 - 12Z Sat Apr 28 2018

...Temperatures will be 10 to 15 degrees below average over parts
of the Tennessee Valley...

Low pressure over the Northeast will lift northeastward into
Eastern Canada by Thursday evening.  The system will produce rain
over the Northeast that will end overnight Thursday.  A second
area of low pressure over Tennessee Valley will move northeastward
to the Northern Mid-Atlantic Coast by Friday evening.  The storm
will produce rain with embedded thunderstorms over parts of the
Tennessee and Lower Mississippi Valleys that will move eastward to
the Southeast by Thursday evening.  The precipitation will be
showers and thunderstorms over parts of the Southeast and rain
extending from parts of the Tennessee/Lower Mississippi Valleys
into the Southern Ohio Valley/Mid-Atlantic.  On Friday morning, an
area of showers and thunderstorms will develop over parts of the
Mid-Atlantic Coast with rain extending from parts of the Northern
Mid-Atlantic to parts of the Southern Mid-Atlantic.  By Friday
evening, rain will move into Northern New England extending
southward to parts of the Southern Mid-Atlantic.

Meanwhile, a front extending from the Upper Great Lakes
southwestward to the Southern High Plains/Southern Rockies will
move eastward to the Lower Great Lakes to parts of the Tennessee
Valley/Lower Mississippi Valleys by Friday evening.  The boundary
will produce rain over parts of the Upper Mississippi Valley that
will, likewise, move eastward to the Lower Great Lakes/Ohio
Valley/Central Appalachians by Friday evening into Saturday.  In
addition, a clipper system over South-Central Canada will move
southeastward to Illinois by Friday evening.  The storm will begin
to produce rain over parts of the Upper Mississippi Valley
overnight Thursday that will move into parts of the Upper Great
Lakes/Ohio Valley by Friday evening.

Another front will move onshore over the West Coast overnight
Thursday advancing eastward to the Northern Intermountain Region
to Southern California by Friday evening.  The system will begin
to produce rain over parts of California by Thursday evening.
Overnight Thursday, the rain will move into parts of the Pacific
Northwest/Northern California that will expand inland to parts of
the Northern Intermountain Region overnight Friday.


Ziegenfelder


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





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