562
FXUS01 KWBC 220737
PMDSPD

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

Valid 12Z Fri Aug 22 2025 - 12Z Sun Aug 24 2025

...Heavy to excessive rainfall potential from the Gulf Coast to
the Southeast Coast...

...Extreme heat concerns in the West this weekend...


A stationary front draped along the Gulf/Southeast Coasts will act
as a focus for showers and thunderstorms this weekend. A
combination of instability, lift (frontal boundary) and
substantial moisture will combine to produce heavy rainfall along
the stationary front. Portions of southern Georgia into southern
South Carolina will likely experience the most intense rainfall
from this event today, which is why a high end slight risk (at
least 25% chance) of excessive rainfall leading to flash flooding
is in effect. Isolated instances of flash flooding will be
possible over portions of the Central/Southern Appalachians on
Saturday due to the approaching cold front and upper trough from
the west.

An upper-level ridge parked over the West will support ongoing
monsoonal storms from the Desert Southwest through the Four
Corners and into the Central/Southern Plains this weekend. In
addition to the storm threat, a heat wave will expand across much
of the Western U.S. through this weekend, with the most intense
and long-lasting heat expected across the Desert Southwest into
the San Joaquin Valley. Extreme Heat Warnings and Watches are in
effect from portions of Arizona through Washington. These
locations are most at risk for dangerous levels of heat, posing a
threat to anyone without effective cooling and adequate hydration.
Numerous daily high temperature records are possible. 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 don`t cool down. Without
A/C or cooling, the body can`t recover increasing the risk of heat
illness.


Kebede


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