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 130434
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1134 PM CDT Sat Jul 12 2025
Valid 131200Z - 141200Z
...Synopsis...
A mid-level wave will begin to traverse the northern periphery of
the western ridge today, bringing an increase in westerly flow
across the Cascades in central Washington and northern Oregon.
Elevated fire weather conditions will be likely across the Cascade
Gaps and into the Columbia Basin, where relative humidity reductions
around 20 percent will overlap winds sustained 10-15 mph (locally
higher). An Elevated was maintained with this outlook to support
potential for increased fire spread potential.
...Dry Thunderstorms...
A mix of wet/dry thunderstorms will be possible in Northern Arizona
today. Moisture banked across the Mogollon Rim becomes less with
northern extent, where PWs drop to around 0.25-0.50". Storm motions
will be around 10-20 mph, but coverage should allow multiple rounds
of storms. However, outside of heavier cores and where less coverage
is expected across the western rim, there could be a few instances
of dry lightning. Overall, the small coverage of this risk does not
warrant inclusion of an area at this time.
..Thornton.. 07/13/2025
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 130435
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1135 PM CDT Sat Jul 12 2025
Valid 141200Z - 151200Z
...Synopsis...
Winds across the Pacific Northwest will increase again on D2/Monday
as a belt of enhanced mid-level westerlies moves out of British
Columbia along with a south-southeastward moving cold front.
Elevated fire weather concerns will continue across the Cascades
into the Columbia River Basin and further east in the Snake River
Plain in Idaho. Winds around 15-20 mph will overlap relative
humidity reductions to around 15-20 percent in these regions. A few
hours of locally Critical conditions will be possible across the
Snake River Plain, however, limited coverage precludes introduction
of a Critical area.
..Thornton.. 07/13/2025
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 122159
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0459 PM CDT Sat Jul 12 2025
Valid 141200Z - 201200Z
...Days 3-5/Monday-Wednesday...
A mid-level trough descending southeastward from British Columbia
will bring increasing fire weather concerns to portions of the
Northwestern U.S. and Great Basin early next week. Accelerating
winds ahead a strong cold front, low daytime relative humidity and
dry fuels will increase wildfire spread potential across the
Columbia Basin and Snake River Plain on Day 3/Monday, with overall
fire weather threat shifting into the Great Basin by Day 4/Tuesday.
The resulting back door cold front and north-northeast pressure
gradient could also bring a period of weak offshore flow to the
coastal ranges of OR Day 4-5/Tuesday-Wednesday, but some lingering
model uncertainty in wind magnitude precludes introduction of
critical probabilities at this time. Farther east, wetting rains and
cooler temperatures associated with the trough and cold front should
mitigate fire weather concerns across much of Montana Day 4/Tuesday.
...Day 6-8/Thursday-Saturday...
A mid-level low near Baja California along with a general rebuilding
of the ridge across the Western U.S. could aid in ushering in deeper
monsoon moisture into portions of the Southwest and Great Basin for
the latter portion of the week. Considerable ensemble spread in
moisture plume evolution limits confidence in isolating dry
thunderstorm threat for now.
..Williams.. 07/12/2025
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