Prognostic Meteorological Discussion
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804
FXUS01 KWBC 200723
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
323 AM EDT Sat Jul 20 2019

Valid 12Z Sat Jul 20 2019 - 12Z Mon Jul 22 2019

...Dangerous heat wave ongoing from the Central U.S. to the East
Coast...

...There is a slight risk of severe thunderstorms over parts of
the Great Lakes into the Middle Mississippi Valley and the Central
High Plains...

There is a slight risk of excessive rainfall from parts of the
Central High Plains into parts of the Middle Mississippi Valley...

Excessive Heat Warnings and Heat Advisory extend from parts of the
Texas Panhandle to the Middle Mississippi/Ohio Valleys and parts
of the Great Lakes as well as parts of the Northeast southward to
the Southern Mid-Atlantic as upper-level ridging extends from
parts of the Southwest eastward to the Northeast/Mid-Atlantic.
Daytime temperatures in the mid to upper 90s combined with high
humidity will result in heat indices as high as 115 for some.  As
overnight temperatures will provide little relief as temperatures
struggle to get below the upper 70s or even low 80s.  Possible
record high minimum temperatures are forecast from parts of the
Middle Mississippi Valley into the Great Lakes/Ohio Valley and
from parts of New England southward to the Carolinas into the
Tennessee Valley on Saturday into Monday.  Furthermore, record
high temperatures are forecasted for parts of the Great Lakes/Ohio
Valley into parts of the Mid-Atlantic on Saturday into Sunday.
Please see www.weather.gov for the latest on the coverage of
warnings and advisories, and also tips on how to stay safe in this
heat.

A slow moving front crossing the Great Lakes into Central Plains
will focus convection over this region, with SPC highlighting the
Great Lakes into parts of the Middle Mississippi Valley with a
slight risk for severe thunderstorms.  The system also has a
slight risk of excessive rainfall that could produce flash
flooding on Saturday.  The showers and thunderstorms will extend
from parts of the Mid-Atlantic to the Middle Mississippi Valley by
Monday morning.  Elsewhere, diurnally driven showers and
thunderstorms are expected over much of the Southeast into the
Central Gulf Coast and Tennessee Valley Saturday into Monday.
Overnight Sunday, showers and thunderstorms will develop over
parts of the Central/Southern High Plains into Monday morning.

Ziegenfelder

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





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