913
FNUS21 KWNS 180551
FWDDY1

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1250 AM CDT Sat Jul 18 2026

Valid 181200Z - 191200Z

...Synopsis...
Along the northwestern periphery of an expansive upper ridge over
the West, a midlevel trough will advance eastward across BC and the
Northwest during the day. Within the base of the trough, strong
midlevel southwesterly flow will overspread WA, OR, northern CA, and
northwest NV. Associated downslope flow in the lee of the Cascades
and northern Sierra will aid in deep boundary-layer mixing into the
strengthening flow aloft. This will yield a broad area of 15 mph
sustained west-southwesterly surface winds (with higher gusts) amid
10-15 percent RH. Locally stronger surface winds can be expected in
terrain-favored/gap-flow areas through the Cascades. Given
dry/receptive fuels across region, elevated fire-weather conditions
are expected.

Farther east, lee troughing over the northern High Plains will
promote 10-15 mph sustained easterly surface winds across parts of
southeastern WY during the afternoon. These winds, combined with
15-20 percent RH and dry fuels, will favor elevated fire-weather
conditions.

..Weinman.. 07/18/2026

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

$$