789
FXUS01 KWBC 241826
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
225 PM EDT Sun Aug 24 2025

Valid 00Z Mon Aug 25 2025 - 00Z Wed Aug 27 2025

...There is a Slight Risk of excessive rainfall over parts of the
Sierra Nevada Mountains, Central/Southern High Plains, and Great
Basin on Sunday...

...There is a Slight Risk of excessive rainfall over parts of the
Southwest, Central/Southern Rockies, and Central/Southern Plains
on Monday...

...There are Extreme Heat Warnings and Heat Advisories along the
West Coast and just inland...

A front extending from the Lower Great Lakes/Ohio Valley to the
Lower Mississippi Valley/Southern Plains will advance eastward off
the East Coast and most of the Gulf Coast and into the Southern
Plains by Tuesday.  The front will produce showers and
thunderstorms over the Lower Great Lakes and Central/Southern
Appalachians, and rain in parts of the Great Lakes on Sunday and
Monday. Showers and thunderstorms will also develop over parts of
the Southeast through Tuesday.

Moreover, monsoonal moisture, diurnal heating, and upper-level
impulses will produce showers and thunderstorms over
Central/Southern California, the Southwest, the Great Basin, the
Central/Southern Rockies, and the Central/Southern High Plains on
Sunday. Heavy rain will develop over parts of the Central/Southern
High Plains and a second area over parts of the Southwest on
Sunday. Therefore, the WPC has issued a Slight Risk (level 2/4) of
excessive rainfall over the Central/Southern High Plains, as well
as the Southwest, through Monday morning.  The associated heavy
rain will primarily create localized areas of flash flooding, with
urban areas, roads, small streams, and low-lying areas being the
most vulnerable.

Showers and thunderstorms will develop over parts of
Central/Southern California on Sunday. Heavy rain will develop
over parts of the Sierra Nevada Mountains. Therefore, the WPC has
issued multiple areas for Slight Risk (level 2/4) of excessive
rainfall over the Sierra Nevada Mountains through Monday morning.
The associated heavy rain will primarily create localized areas of
flash flooding, with urban areas, roads, small streams, and
low-lying areas being the most vulnerable.

For Tuesday, showers and thunderstorms are expected to develop
over parts of Oregon, interior California, the Great Basin, the
Southwest, and the Central/Southern Rockies, as well as the
Central/Southern Plains. Heavy rain will develop over parts of the
Central/Southern Rockies. Therefore, the WPC has issued a Slight
Risk (level 2/4) of excessive rainfall over the Central/Southern
Plains from Tuesday through Wednesday. The associated heavy rain
will primarily create localized areas of flash flooding, with
urban areas, roads, small streams, and low-lying areas being the
most vulnerable.

Another area of showers and thunderstorms will develop over parts
of the Central/Southern Plains with heavy rain on Tuesday.
Therefore, the WPC has issued a Slight Risk (level 2/4) of
excessive rainfall over the Southwest from Tuesday through
Wednesday. The associated heavy rain will create mainly localized
areas of flash flooding, with urban areas, roads, small streams,
and low-lying areas being the most vulnerable.

Meanwhile, an upper-level high over the Southwest into the
Central/Southern Rockies will aid in creating a heat wave across
much of the Western U.S. through the weekend, with the most
intense and long-lasting heat across the Desert Southwest into the
San Joaquin Valley. Extreme Heat Warnings and Watches are in
effect from portions of Arizona through Washington State. This
type of heat will be dangerous, posing a threat to anyone without
effective cooling and adequate hydration. Numerous daily high
temperature records are likely to be broken. For many areas, there
will be little nighttime relief from the extreme heat, with
overnight lows remaining well above normal. Numerous nighttime
temperature records are likely. Extreme heat is dangerous even at
night when temperatures do not cool down. Without air conditioning
or cooling, the body cannot recover, increasing the risk of
heat-related illnesses.

Stay informed and take steps to protect yourself from heat-related
illnesses. For information on staying cool and safe, visit
www.weather.gov/safety/heat. As temperatures rise, limit outdoor
activity, stay hydrated, and ensure access to air-conditioning and
other cooling areas.


Ziegenfelder


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