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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 281646
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1146 AM CDT Tue Jul 28 2026
Valid 281700Z - 291200Z
...NO CRITICAL AREAS...
The forecast remains on track for locally elevated fire weather
conditions across portions of the northwestern CONUS. See the
previous discussion for more information.
..Elizalde-Garcia.. 07/28/2026
.PREV DISCUSSION... /ISSUED 1234 AM CDT Tue Jul 28 2026/
...Synopsis...
An upper-level shortwave trough will move over Washington and
British Columbia, with an associated cold front moving through much
of the Northwest late in the day and overnight. Widespread smoke
will continue across the northwestern US, east of the Cascades.
Upper-level ridging will continue over the southern/central Rockies
and much of the Plains, with scattered monsoonal thunderstorms
across the Four Corners region.
West-southwest sustained winds of 10-20 mph with gusts of 20-30 mph
will develop across portions of the Inland Northwest ahead of an
approaching cold front and under strengthening flow aloft. RH will
fall to 20-35% across central/eastern Washington and northern Oregon
where winds are forecast to be the strongest leading to locally
elevated conditions. Winds will shift to west-northwest behind the
front in the evening and overnight as it pushes southeast across the
region. However, RH is likely to increase behind the front by 5-15%,
with better RH recovery overnight.
Locally elevated conditions are also expected across portions of the
western/northern Great Basin into the northern Rockies with
west-southwest winds of 10-20 mph amid minimum RH of 8-20%. While
deeper, more widespread daytime mixing is expected across Nevada,
smoke will likely inhibit mixing farther north where stronger flow
aloft exists.
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 281911
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0211 PM CDT Tue Jul 28 2026
Valid 291200Z - 301200Z
...NO CRITICAL AREAS...
No changes were made to the Day 2/Wednesday fire weather outlook;
see the previous discussion for more information.
..Elizalde-Garcia.. 07/28/2026
.PREV DISCUSSION... /ISSUED 1235 AM CDT Tue Jul 28 2026/
...Synopsis...
Weak upper-level troughing will linger over the northwestern US, but
heights will build over much of the West. A cold front will stall
and further weaken across the northwestern Great Basin. An upper
high will remain over the southern High Plains/Rockies as a deep
upper-level trough continues over the eastern US.
Dry and breezy conditions are likely to develop across portions of
the Inland Northwest, western/northern Great Basin, and into the
northern Rockies. West-southwest sustained winds of 10-18 mph with
gusts of 20-25 mph amid minimum RH of 5-25% will lead to locally
elevated conditions. Additionally, hot, dry, and breezy conditions
will continue in portions of the Texas Panhandle and western
Oklahoma amid a fuelscape of mixed receptiveness.
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 282138
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0438 PM CDT Tue Jul 28 2026
Valid 301200Z - 051200Z
...Synopsis...
Upper-level troughing is forecast to continue across portions of the
Pacific Northwest through much of the workweek, with the main
upper-level low remaining offshore. On Day 3/Thursday, a strong and
well-defined mid-level shortwave will rotate through the base of the
trough and over the region within southwest flow aloft. This feature
will promote thunderstorm chances with minimal precipitation across
the Northern Rockies amid a receptive fuelscape. Thereafter,
long-range ensemble guidance continues to suggest that the
aforementioned upper-level low will move onshore this weekend,
yielding dry and breezy conditions across the Northwest and Northern
Rockies. Early next week, model guidance begins to differ in the
progression of the overall upper pattern, with some solutions
depicting a ridge to rebuild over the western CONUS, while others
portray weak northwesterly flow across the Pacific Northwest.
Regardless, trends will continue to be monitored.
...Northwestern US...
Wet/dry thunderstorm chances return on Day 3/Thursday as a shortwave
trough impinges upon the region. Ample instability, a dry boundary
layer, and sufficient mid-level moisture support 10% dry
thunderstorm probabilities. A lingering dry boundary layer and warm
daytime temperatures are expected to increase fuel receptivity
(forecast ERCs approaching the 95th percentile), enhancing concerns
for new lightning ignitions. Gusty winds and a dry airmass return to
the Pacific Northwest this weekend as the offshore trough moves
inland, with greater potential for critical fire conditions to
materialize -- especially where strong winds/low RH overlap areas
where preceding days of thunderstorms may result in holdover
ignitions. As such, 40% Critical probabilities have been maintained
on Days 5-6/Saturday-Sunday.
...Southern High Plains...
Hot, dry, and breezy conditions are likely across portions of the
southern High Plains on Day 3/Thursday; however, fuels guidance
suggests the fuelscape remains mostly mixed, precluding the
introduction of probabilities. Nevertheless, daytime RH values of
15-20% and sustained southerly winds of 15-20 mph should promote
locally elevated fire weather concerns where pockets of dry fuels
exist.
..Elizalde-Garcia.. 07/28/2026
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