544
FNUS21 KWNS 080556
FWDDY1

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1255 AM CDT Tue Sep 08 2026

Valid 081200Z - 091200Z

...Synopsis...
A trailing upper-level wave and associated stronger mid-level flow
will move into the Northern Rockies and northern High Plains through
today as another upper trough accelerates eastward into the Great
Lakes. At the surface, a cold front extending southwestward from a
deep low pressure in Manitoba Canada will push through the Northern
Plains. As a result, the tighter pressure gradient across the
northern High Plains will bolster westerly surface winds over much
of northern/eastern WY as well as portions of southwestern SD, the
NE Panhandle and southeastern MT. These winds along with a dry air
mass augmented by downslope trajectories will support an elevated
fire weather threat today.

...Southeastern Montana into northern/eastern Wyoming and the Black
Hills vicinity...
A 50-60 knot mid-level jet at the base of an approaching short wave
will overspread much of southeastern MT, eastern WY and adjacent
northern Plains later today as westerly winds at the surface are
aided by a lingering modest pressure gradient. Minimum daytime RH of
10-20% will be concentrated in central/northeastern WY with late day
cloud cover infiltrating into southern MT ahead of an advancing
secondary cold front, limiting RH reductions along and north of the
MT/WY border. Although temperatures will be a few degrees cooler
than Monday, the deep layer west-southwest flow and well-mixed
boundary layer should still promote west winds of 15-20 mph by
mid-afternoon. These winds and low RH coincident with dry fuels will
support elevated fire weather concerns across southeastern Montana,
northern/eastern Wyoming and the Black Hills areas. The daytime
westerly winds along with an early/late evening northwest wind shift
could also impact active wildfires within this region.

..Williams.. 09/08/2026

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

$$