858
FNUS21 KWNS 241639
FWDDY1

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1138 AM CDT Sun Aug 24 2025

Valid 241700Z - 251200Z

The IsoDryT was expanded slightly in northern California and
portions of Oregon based on the latest observations and
high-resolution forecast guidance. On the western and northern
fringes of the monsoonal moisture induced cloud cover, isolated
thunderstorms are already occurring this morning in portions of
southern/central/eastern Oregon. A weak mid-level shortwave trough
is evident via satellite imagery and mesoanalysis in northern
California, which should continue to drift north and expand westward
coverage of mixed wet/dry thunderstorms in northern California and
Oregon, including west of the Cascades. Isolated mixed wet/dry
thunderstorms are also possible across southeast Oregon and
along/near the Idaho border with Nevada and Utah into western
Wyoming.

Hot, dry, unstable, and locally breezy conditions will continue from
northwest California, through western Oregon, and into portions of
Washington near a thermal trough. Eastern Idaho, western Wyoming,
and portions of California also have the potential on the fringe of
the monsoonal moisture/thunderstorm potential for deep
pyroconvection on active large wildfires.

..Nauslar.. 08/24/2025

.PREV DISCUSSION... /ISSUED 0153 AM CDT Sun Aug 24 2025/

...Synopsis...
Monsoonal moisture is well established beneath an expansive
large-scale ridge encompassing much of the West. Along the northern
periphery of the deeper midlevel moisture plume, a mix of wet/dry
thunderstorms are expected across parts of northern CA into
southern/central OR during the afternoon into the evening hours --
aided by inverted-V profiles and 0.80-0.90 inch PW. Given modestly
receptive fuels, these storms will pose a risk of isolated
lightning-induced ignitions and gusty/erratic outflow winds.
Scattered high-based thunderstorms are also expected across much of
the Great Basin and the remainder of inland CA, though deeper
midlevel moisture and relatively slow storm motions may tend to
favor a wetter storm mode over these areas.

...Please see www.spc.noaa.gov/fire for graphic product...

$$