The Weather Prediction Center

Short Range Forecast Discussion

[Abbreviations and acronyms used in this product]
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Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
353 AM EDT Thu Jul 20 2017

Valid 12Z Thu Jul 20 2017 - 12Z Sat Jul 22 2017

...There is a slight risk of severe thunderstorms over parts of
the Lower Great Lakes/Ohio Valley and the Northern/Central High
Plains ...

...Heavy rain possible over parts of the Upper/Middle Mississippi
Valley into the Western Ohio Valley...

...Temperatures will average 10 degrees above average over parts
of the Central Plains/Middle Mississippi Valley...

A front extending from the Northeast/Northern Mid-Atlantic
westward to the Northern/Central Plains will become
quasi-stationary as the eastern end of the boundary dissipates
overnight Thursday.  The remaining parts of the boundary will
linkup with the energy from another front moving southeastward
from Central Canada by Friday morning.  Showers and thunderstorms
will develop along and ahead of the front over the Great Lakes
westward into parts of the Northern/Central Plains that will move
eastward to the Northeast westward to the Middle Mississippi
Valley by Thursday night.  The showers and thunderstorms will move
off the Northeast Coast by Friday morning and continue over parts
of the Ohio Valley/Middle Mississippi Valley on Friday into Friday
evening. 

Another front will develop over the Northern Intermountain
Region/Northern Rockies by Thursday evening and advance eastward
to the Northern Plains/Great Basin by Friday evening.  Showers and
thunderstorms will develop along and ahead of the boundary over
parts of the Northern High Plains/Northern Rockies by Thursday
evening that will expand into the Northern Plains overnight
Thursday.  On Friday, the showers and thunderstorms will move into
parts of the Upper Mississippi Valley/Central Plains into Friday
evening. 

Meanwhile, monsoonal moisture and daytime heating along with
upper-level energy will aid in producing showers and thunderstorms
over parts of the Southwest/Great Basin eastward to the
Central/Southern Rockies through Friday evening.  The showers and
thunderstorms will have the greatest areal coverage during the
late afternoon into late evening on Thursday and Friday.  In
addition, moisture rich air over the Southern
Mid-Atlantic/Southeast Coast and across the Gulf Coast State will
interact with daytime heating and upper-level impulses to produce
showers and thunderstorms along and near the coastal region
through Friday evening.  Similarly, the showers and thunderstorms
will have the greatest areal coverage during the late afternoon
into late evening on Thursday and Friday.    

Elsewhere, onshore flow off the Pacific will aid in producing rain
over parts of the Pacific Northwest through late Thursday night.


Ziegenfelder


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




Last Updated: 353 AM EDT Thu Jul 20 2017