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Day 1 Fire Weather Outlook  
NWS Storm Prediction Center Norman OK
0153 AM CDT Sun Sep 04 2022

Valid 041200Z - 051200Z

...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF FAR NORTHEASTERN
CALIFORNIA...NORTHWESTERN NEVADA...AND SOUTHEASTERN OREGON...

...Synopsis...
Two upper-level shortwave troughs are forecast to move over the
ridge centered in the Great Basin today, acting to deamplify the
upper-level high pressure.  The first small and co*pact shortwave
over northwestern Montana this morning is forecast to weaken and
move eastward across northern Montana and North Dakota throughout
the day.  The second shortwave, currently off the Pacific Northwest
coast, is forecast to move into British Columbia and Washington
state by the end of the day.  In response at the surface, a
low-pressure trough is forecast to develop over the northern High
Plains.

Ahead of these shortwave troughs, a broad area of elevated fire
weather conditions is expected from northeastern California
east-northeastward across Montana. The environment across this
region will be characterized by hot, dry, and well-mixed boundary
layers yielding critical RH values in the presence of enhanced flow
aloft.  The best overlap of strong winds (>20 mph) and critical RH
values is in the vicinity of the California/Nevada/Oregon border, so
a focused critical area has been delineated across that region.  

Farther east ahead of the surface pressure trough, critical
south-southeasterly winds are likely across the western Dakotas, but
RH values may be a limiting factor with surface dewpoints only
mixing into the mid-to-upper 40s F. Nevertheless, this different
fire-weather regime co*pared to areas farther west should also lead
to elevated fire-weather concerns.

..Jirak.. 09/04/2022

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