930
FNUS21 KWNS 190657
FWDDY1

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0156 AM CDT Tue Aug 19 2025

Valid 191200Z - 201200Z

...Synopsis...
An amplifying mid-level ridge over the Four Corners region will
support a large area of hot and dry conditions over much of the
Intermountain West. On the northern periphery of the ridge,
southwesterly flow aloft will increase ahead of a shortwave trough.
This will allow a dry cold front to approach and stall over the
northwestern Great Basin. Ahead of the front, very warm and dry
conditions are expected. With the increased flow aloft, forecast
guidance shows south-southwest surface winds increasing to around 15
mph with gusts to 20-25 mph. The stronger winds amid a very dry
airmass will support minimum RH of 5-15%. With regional fuels very
dry, elevated fire-weather conditions appear likely.

...Northern Rockies...
To the northwest, the mid-level trough and remnant monsoon moisture
may support isolated thunderstorm potential across the higher
terrain of the northern Rockies. Some lightning is possible, though
the highest storm chances are expected over western MT and
northeastern ID where less receptive fuels are present. This
suggests the threat for ignitions is modest and below 10% coverage
for IsoDryT highlights.

..Lyons.. 08/19/2025

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

$$