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U.S. & Canada 00-UTC 48 Hour Surface Smoke Forecast
Map is in operation from early April through October 31
U.S. Day 1 Fire Weather Outlook
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 030526
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1226 AM CDT Thu Sep 03 2026
Valid 031200Z - 041200Z
...Synopsis...
A corridor of southwesterly flow between the mid-level trough over
the Northwest and the central US ridge will continue to present an
area of gusty winds and low RHs to MT/WY and portions of the Great
Basin today. Elevated fire weather concerns remain farther northeast
along the axis of dry southwest flow over central WY with dry but
generally slightly less windy conditions present over adjacent
portions of MT, NE, and SD as well. Deep and dry southwesterly flow
amid lee surface troughing will continue to support surface winds of
15-20 mph coincident with daytime RHs of 10-20%. Similarly,
southwest winds of 15-25 mph amid RHs dropping as low as 10-15% are
likely across southeastern NV into southwestern UT this afternoon.
However, relatively damp fuels will mitigate an otherwise critical
fire weather event across that region, resulting in potentially
localized elevated fire weather conditions this afternoon.
..Stearns.. 09/03/2026
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 030548
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1248 AM CDT Thu Sep 03 2026
Valid 041200Z - 051200Z
...Synopsis...
An additional day of Elevated fire weather conditions can be
expected across the northern High Plains on Day 2/Friday. With the
persistent large trough dominating the Northwestern CONUS, an
upper-level jet streak will round it's base and allow for stronger
winds centered over ID on the afternoon of Day 2/Friday. Given the
continued compact surface pressure gradient and well-mixed boundary
layer over the region, windy and dry conditions will impact the
surface, resulting in afternoon sustained southwesterly winds of
15-20 mph coincident with RHs of 10-20%. Again, portions of the
southern to central Great Basin will experience similar wind/RH
conditions, but fuels remain less receptive to ignitions. Meanwhile,
upper-level ridging remains over the central CONUS, prolonging hot
and dry conditions in the central and southern Great Plains. This
continues to cure both dead and live fuels in the absence of
widespread beneficial precipitation.
..Stearns.. 09/03/2026
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 022131
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0431 PM CDT Wed Sep 02 2026
Valid 041200Z - 101200Z
...Synopsis...
Upper-level troughing will linger across the northwestern U.S.
through early next week while ridging will hold firm over the
central U.S. This pattern will likely suppress overall fire weather
concerns and fuel receptivity across much of the West under an
extended period of cloud cover, cooler temperatures and
precipitation. A lingering fire weather threat will persist into Day
3/Friday for portions of WY and northern High Plains under dry
southwest flow ahead of the broader upper trough. Additional
mid/upper moisture from tropical cyclone activity in the eastern
Pacific has the potential to advect into southern CA and the
southwestern CONUS but forecast rainfall amounts and distribution
remain uncertain. Nonetheless, fire weather concerns will generally
decline over the weekend into next week across the West.
...Day 3/Friday...
A corridor of dry, southwesterly flow ahead of the broader trough
across the Northwest will promote fire weather concerns across
portions of WY and the northern High Plains Day 3/Friday. Minimal
rainfall and persistently dry fuels combined with southwest winds of
10-20 mph and RH as low as 10% Friday afternoon supports the
continuation and slight expansion of a 40% critical area for
northeastern WY, southeastern MT and adjacent SD/ND border areas.
Farther southwest, a similarly dry and breezy environment sets up
over southern NV into western UT. However, marginal fuels after
prior rainfall preclude introduction of critical probabilities.
..Williams.. 09/02/2026
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