313
FNUS22 KWNS 181852
FWDDY2

Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0152 PM CDT Fri Jul 18 2025

Valid 191200Z - 201200Z

Tomorrow`s (Day 2/Saturday) fire weather forecast remains largely
on-track, with only modest areal adjustments needed to the outlook
areas based on the latest ensemble forecast guidance. The primary
change with this update was to expand the Elevated area across the
northern Great Basin a bit farther north/northeast into southwest
Montana and also westward into portions of northern California and
southeast Oregon. Locally critical conditions are most likely across
the wind-prone portions of the Snake River Plain and Upper Snake
River Valley in Idaho, where localized areas of sustained surface
winds exceeding 20 mph and RH values less than 15% are possible for
several hours during the afternoon/evening.

Please see the discussion below for more information on tomorrow`s
fire weather forecast.

..Elliott.. 07/18/2025

.PREV DISCUSSION... /ISSUED 1218 AM CDT Fri Jul 18 2025/

...Synopsis...
A low-amplitude upper level trough will pivot through the Northwest
on Saturday. In the lee of the northern Rockies, a surface low will
deepen in central Montana. Mid-level moisture will be pushed
slightly southward and eastward by the sagging upper trough in the
Northwest. Additional thunderstorms are possible in the parts of the
central/eastern Great Basin. However, PWAT values and slower storm
motions do not suggest a significant threat for new ignitions.

...Columbia Basin and northern Nevada/southern Idaho...
Elevated fire weather conditions are again expected in the Columbia
Basin. With the core of the mid-level jet primarily being east of
the region by the afternoon, the overall setup should favor slightly
less strong wind coverage. Winds of 15-20 mph are still possible. RH
may be a touch higher than on Friday with around 20% being probable
during the afternoon.

With the trough sagging southward and the surface low deepening, a
zone of 15-20 mph (locally higher) winds is possible in parts of the
northern Great Basin. RH could fall as low as 10-15% by the
afternoon.

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

$$