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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 040535
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1235 AM CDT Tue Aug 04 2026
Valid 041200Z - 051200Z
...Synopsis...
An upper trough will expand across the northern Plains and Upper
Midwest with strong westerly flow overspreading southeastern Idaho
into the Dakotas. Meanwhile, a weak upper low will separate from a
departing eastern CONUS trough, providing enough forcing for
afternoon thunderstorms across the Southeast.
A weak surface low will emerge across the Four Corners region,
tightening a surface pressure gradient along the West Slope; as a
result, gusty winds are expected across portions of the Great Basin
and Colorado Plateau this afternoon. Strong daytime mixing will
result in RH values of 5-15% and sustained westerly winds of 12-20
mph (gusts up to 30 mph) amid receptive fuels, maintaining Elevated
fire weather highlights. Farther west, hot, dry, and unstable
conditions are expected along/near a thermal trough extending out of
northern California into western Oregon/Washington. Lighter winds
across the spatial region preclude an introduction of fire weather
highlights; however, gusty winds in terrain-favored areas could
result in locally elevated conditions.
..Elizalde-Garcia.. 08/04/2026
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 040536
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1236 AM CDT Tue Aug 04 2026
Valid 051200Z - 061200Z
...NO CRITICAL AREAS...
...Synopsis...
Upper-level troughing over the north/central U.S. will gradually
shift eastward into the Great Lakes region, while upper ridging
continues to strengthen and lift northward across the western CONUS.
A dry airmass will persist in the Interior West amid a very dry
fuelscape, but weakening mid/upper-level flow as the trough departs
should limit broader sustained winds to less than 15 mph. However,
locally elevated fire concerns may emerge across southeast Idaho
into portions of the Colorado Plateau and adjacent higher elevations
where terrain-driven winds combine with RH values of 5-15%. Farther
west, locally elevated fire weather conditions are expected as a
thermal trough extending out of northern California into western
Oregon/Washington promotes hot, dry, unstable, and localized breezy
winds.
..Elizalde-Garcia.. 08/04/2026
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 032141
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0441 PM CDT Mon Aug 03 2026
Valid 051200Z - 111200Z
An upper-level ridge will build over the West as upper-level
troughing exits the northern Rockies/Plains Day 3/Wednesday - Day
4/Thursday. Upper-level troughing will approach the Pacific
Northwest beginning on Day 4/Thursday and begin to shift and
eventually flatten the ridge over the northwestern US late in the
week and this weekend. Forecast uncertainty remains regarding the
magnitude and duration of the flattening/break down of the
upper-level ridge over the northwestern US this weekend and early
next week.
Breezy west-northwest winds amid critical RH are likely to continue
on Day 3/Wednesday across portions of southeast Idaho through
southwest Wyoming and into Colorado west of the Divide. Locally
elevated conditions are likely, especially if stronger flow aloft
remains over these areas on the periphery of the upper-level trough
moving over the north-central CONUS. Locally elevated conditions are
also possible as hot, dry, unstable, and locally breezy winds are
expected again along/near a thermal trough across portions of
northern California and western Oregon.
With the expected flattening and potential break down of the
upper-level ridge over the northwestern US, dry/windy conditions are
likely to return to the region. As westerly winds strengthen amid a
dry airmass, elevated to critical fire weather conditions are likely
to develop across portions of the Inland Northwest extending
southward to the Sierra Front and across portions of the northern
Great Basin and northern Rockies onto the northern High Plains.
Forecast guidance indicates Day 5/Friday as the most likely day for
these conditions to occur, which is why a 40% area was introduced.
However, these conditions could continue and spread/shift farther to
the south/east on Day 6/Saturday. The aforementioned forecast
uncertainty with the timing/magnitude of the ridge break down
precludes expanding or including additional probabilities at this
time.
Monsoonal moisture will remain mostly confined to southern Arizona
into portions of New Mexico through mid-week. Moisture will likely
begin to spread northward into portions of northern Arizona and
eventually into the Great Basin late in the week and over the
weekend. Isolated mixed wet/dry thunderstorms are possible over
portions of southern Nevada/Utah beginning as early as Day
4/Thursday, with chances increasing into the weekend as moisture is
forecast to continue moving northward. While thunderstorms are
likely to return to portions of the Great Basin late this week and
this weekend, there is too much forecast uncertainty regarding the
overlap of drier storms and receptive fuels to introduce dry
thunderstorm probabilities at this time.
..Nauslar.. 08/03/2026
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