Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 AM EDT Mon Jul 22 2024

Valid 12Z Mon Jul 22 2024 - 12Z Wed Jul 24 2024

...Major to locally extreme Heat Risk expected to expand from the Great
Basin into the northern High Plains by Wednesday as well as over portions
of the Central Valley of California...

....Scattered thunderstorms across the southern Plains to the Southeast
today near a stalled front will gradually shift toward the East Coast as
another front will spread additional thunderstorms across the Great Lakes
to New England Tuesday and Wednesday...

...Monsoonal thunderstorms continue across the Great Basin and into the
Four Corners region with threat of localized flash flooding...

A slow-to-evolve summertime weather pattern continues across the U.S.
mainland as we head into late July.  This weather pattern will sustain the
ongoing heat wave across the western U.S. while maintaining cooler than
normal temperatures across the mid-section of the country and into
portions of the East Coast.  The prolonged nature of the heat in the West
will keep the Heat Risk at major to locally extreme levels across portions
of the Central Valley of California, and the Great Basin today where
another afternoon of triple digit high temperatures is expected. 
Meanwhile, a Pacific cold front will set things in motion a bit as the
front moves inland across the Pacific Northwest through the next couple of
days.  Triple-digit high temperatures will then expand eastward into
northern High Plains by Wednesday ahead of the front while 110s will
persist across the Desert Southwest and 100s in the Central Valley of
California.  Please continue to practice heat safety in this persistent
and prolonged heat wave in the western U.S.

In contrast, cooler than normal temperatures will prevail across the
mid-section of the country and into portions of the eastern U.S. where a
stalled front will keep plenty of clouds along with scattered
thunderstorms.  These thunderstorms are not expected to be potent but they
could result in localized flooding issues from time to time across the
southern tier states.  The upper-level pattern and instability that
support these thunderstorms from the southern Plains to the Southeast
today will gradually expand northeastward into the eastern U.S. on Tuesday
and then generally affect areas from across the Deep South into much of
the East Coast by Wednesday.  Another cold front from eastern Canada will
dip into the northern tier states, bringing additional thunderstorms
across the Great Lakes to New England Tuesday and Wednesday.  Meanwhile,
monsoonal thunderstorms will continue across the Great Basin and the Four
Corners region with the threat of localized flash flooding for the next
couple of days.

Kong


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