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U.S. Day 1 Fire Weather Outlook
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 250659
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0159 AM CDT Fri Sep 25 2026
Valid 251200Z - 261200Z
...Synopsis...
Within the base of a robust midlevel trough moving eastward across
the Northwest, 40-50-kt midlevel west-southwesterly flow will
overspread the northern Great Basin today. Downslope-aided warming
and drying will promote deep boundary-layer mixing, allowing
stronger flow aloft to efficiently mix to the surface ahead of an
eastward-moving cold front. As a result, a corridor of 15-20 mph
sustained west-southwesterly surface winds will combine with 15-20
percent RH across parts of northern NV, southeastern OR, and
southwestern ID this afternoon. Given at least modestly receptive
fuels, elevated fire-weather conditions are expected.
A northerly wind shift is expected behind the cold front this
evening, though weaker post-frontal wind speeds should limit
additional fire-weather concerns.
..Weinman.. 09/25/2026
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 250659
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0159 AM CDT Fri Sep 25 2026
Valid 261200Z - 271200Z
...NO CRITICAL AREAS...
...Synopsis...
A midlevel trough will gradually amplify over the West on Saturday
afternoon, resulting in strengthening deep-layer southerly flow
across parts of the southern and central Great Basin. Deep
boundary-layer mixing will support south-southwesterly surface winds
of 15-20 mph amid afternoon RH of 15-20 percent. While locally
elevated fire-weather conditions are possible across
southern/central NV, marginal fuels should generally limit
fire-weather concerns.
..Weinman.. 09/25/2026
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 242115
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0415 PM CDT Thu Sep 24 2026
Valid 261200Z - 021200Z
...Discussion...
A coastal low will continue to strengthen just off the Mid-Atlantic
coast, bringing gusty surface winds and precipitation chances across
New England this weekend. Meanwhile, an upper shortwave trough will
lift out of the Northern Rockies and into the Canadian Prairies.
Upper winds will moderate slightly on Day 3/Saturday, though an
emerging 30-40 kt 700 mb jet will maintain dry and breezy conditions
across portions of the Great Basin through Day 4/Sunday. The
expected overlap of sustained southerly 15-20 mph winds and near 15%
RH would typically increase fire weather concerns, but such
meteorological conditions will overlap a region of marginal fuels;
thus, precluding Critical probabilities at this time.
Predictability wanes into early next week with ambiguity in the
progression of the overall pattern; however, the development of
deeper troughing over the western CONUS may induce an offshore flow
regime in Southern California on Days 5-6/Monday-Tuesday.
Additionally, some tropical influence from Hurricane Polo could
bring increased moisture to the southwestern CONUS early next week.
..Elizalde-Garcia.. 09/24/2026
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