947
FXUS01 KWBC 221916
PMDSPD

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
316 PM EDT Fri Aug 22 2025

Valid 00Z Sat Aug 23 2025 - 00Z Mon Aug 25 2025

...There is a Slight Risk of excessive rainfall over parts of the
Southeast on Friday/Saturday and the Central/Southern Rockies on
Saturday...

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

A front extending from the Upper/Middle Mississippi Valley
southwestward to the Central Plains/Central Rockies on Friday will
advance eastward to the Lower Great Lakes to the Tennessee
Valley/Southern Plains by Sunday.  The front will produce showers
and thunderstorms from the Upper Great Lakes to the Middle
Mississippi Valley on Friday, over parts of the Great Lakes on
Saturday, and the Lower Great Lakes/Northeast into the Central
Appalachians on Sunday.

A second front over the Southeast will linger through Sunday
morning. The southern boundary will ignite showers and
thunderstorms over the Southeast and along most of the Gulf Coast,
with heavy rain over the Southeast through Saturday. Therefore,
the WPC has issued a Slight Risk (level 2/4) of excessive rainfall
over the Southeast from Friday into Saturday morning and from
Saturday into Sunday.  The associated heavy rain will create
mainly localized areas of flash flooding, with urban areas, roads,
small streams, and low-lying areas the most vulnerable.

In addition, monsoonal moisture, diurnal heating, and upper-level
impulses will produce showers and thunderstorms over southeastern
California, the Southwest, the Great Basin, the Central/Southern
Rockies, and the Central High Plains from Friday into Sunday.
Heavy rain will develop over parts of the Central/Southern Rockies
on Saturday.  Therefore, the WPC has issued a Slight Risk (level
2/4) of excessive rainfall over the Central/Southern Rockies from
Saturday into Sunday morning.  The associated heavy rain will
create mainly localized areas of flash flooding, with urban areas,
roads, small streams, and low-lying areas the most vulnerable.

Showers and thunderstorms will continue over parts of the Great
Basin and into the Central Plains on Sunday. Heavy rain will
develop over parts of the Central Plains/Central Rockies, as well
as a second area over the Great Basin/Southwest.  Therefore, the
WPC has issued a Slight Risk (level 2/4) of excessive rainfall
over the Central Plains/Central Rockies from Saturday into Sunday
morning and the Great Basin/Southwest from Sunday into Monday
morning. The associated heavy rain will create mainly localized
areas of flash flooding, with urban areas, roads, small streams,
and low-lying areas 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 dont cool down. Without A/C or cooling,
the body cant recover, increasing the risk of heat illness.

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
$$