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