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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 281556
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1056 AM CDT Fri Aug 28 2026
Valid 281700Z - 291200Z
No changes were made to the existing drawn areas. The extent of the
existing Elevated wind/RH areas remain on track with the latest
forecast guidance. The most uncertain part of the forecast remains
the area of Isolated Dry Thunderstorms over portions of west-central
CA. While plenty of moisture and lift (via both dynamic forcing from
the approaching trough and mechanical forcing from terrain) exists
from the plume of moisture being drawn northeastward, the biggest
uncertainty remains the magnitude and areal extent of instability.
While areas along the northern periphery of the aforementioned
moisture plume are likely to see too much cloud cover, areas along
the southern periphery stand the best chance at experiencing
isolated thunderstorm activity late this afternoon and evening. The
limited coverage, fast storm motions, low-level dryness, and dry
fuels, are expected to balance the higher moisture content streaming
through the mid/upper levels.
..Stearns.. 08/28/2026
.PREV DISCUSSION... /ISSUED 1217 AM CDT Fri Aug 28 2026/
...Synopsis...
...Northern California into southeast Oregon...
Broad troughing across the West Coast will promote modest surface
trough development from southeast Oregon into portions of the
Sacramento Valley. Surface winds of 15-20 mph and afternoon RH of
10-20% will combine with very dry fuels to bring elevated fire
weather concerns.
...Northwest Montana...
A modest mid-level jet will persist across the northern Rockies into
the afternoon. This feature, along with a surface trough to the
east, will bring dry, downslope winds to the lee of the terrain in
northwest Montana. Winds of 15-20 mph (locally higher in
terrain-favored areas) and 10-20% RH will promote elevated fire
weather during the afternoon.
...Southern California Coastal Ranges into San Joaquin Valley...
Moisture from the remnants of a tropical system will be drawn
northward by the trough off the West Coast. This increase in
moisture at midlevels and subtle lift from the terrain/trough will
contribute to isolated thunderstorm potential. Storm motions will be
fast enough and low levels dry enough to limit rainfall
accumulations where storms can develop. Uncertainty in storm
coverage remains high, but dry fuels would support lightning
ignitions.
...Southern California Transverse Ranges...
A weak offshore flow regime will bring 10-15 mph (locally higher)
winds within the higher terrain. Given the very hot temperatures and
dry fuels, fire weather will be elevated during the afternoon.
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 281910
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0210 PM CDT Fri Aug 28 2026
Valid 291200Z - 301200Z
An area of Elevated wind/RH was added over western OK and northern
TX where criteria will be met under southwesterly winds amid hot and
dry (afternoon RHs near 15-25%) surface conditions. A deeply mixed
boundary layer will support sustained winds up to 15-20 mph reaching
the ground across western OK and northern TX. Even though recent
precipitation has occurred over portions of the drawn area, long and
short term drought continues across the area, leading to ERC/BI
values exceeding their 90th percentiles.
The existing Elevated fire weather area will remain in place across
portions of southeast OR, northwest NV, and surrounding areas. The
latest forecast guidance has trended the combined wind/RH threat
slightly farther south, necessitating a slight reduction along the
northern periphery of the drawn area. However, given recent
monsoonal influence and a current plume of moisture moving over the
region, there is a sharp gradient in fuels receptivity over central
portions of NV that precluded areas further south/east from being
included in the drawn area.
Over portions of north-central/northwest MT, potential for mostly
wet thunderstorms will exist during the afternoon of Day 2/Saturday.
Given the cooler (below normal) temperatures, increased storm
coverage, relatively slow storm motions, and precipitable water
values above 3/4 of an inch, the threat of dry thunderstorms remains
low.
..Stearns.. 08/28/2026
.PREV DISCUSSION... /ISSUED 1218 AM CDT Fri Aug 28 2026/
...Synopsis...
The broad western trough will evolve into a compact upper low within
the Pacific Northwest on Saturday. As this feature progresses
eastward, stronger mid-level winds will overspread the Northwest
into parts of the Great Basin. With a deeper surface low developing
in the northern Great Basin, winds will increase to 15-20 mph near a
surface boundary in southeast Oregon/northwest Nevada. Fuels remain
quite dry in these areas. RH of 10-20% will support an elevated fire
weather threat during the afternoon.
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 282143
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0443 PM CDT Fri Aug 28 2026
Valid 301200Z - 051200Z
...Synopsis...
A series of mid-level troughs will continue impacting the Pacific
Northwest and neighboring areas of the western CONUS throughout the
Extended Outlook time frame. This will leave the northwestern
quadrant of the CONUS under periodically strong southwest to
westerly flow into early next week. Embedded disturbances will
continue to move through the persistent troughing and along the
northern periphery of the flattening/displaced upper-level ridge
centered over the southern Plains. This activity will deflect
monsoonal moisture to the south and east. Low predictability and
poor agreement among ensemble clusters precludes additional
probabilities beyond Day 5/Tuesday. The general consensus does favor
continued well below normal temperatures across the western third of
the CONUS mid-to-late next week along with increasing chances for
multiple days of accumulating rainfall over a good portion of the
Pacific Northwest.
...Southern Plains...
Over the southern Plains, the continued hot and dry period
exacerbating existing drought conditions will allow for gusty
southwesterly low/mid level flow to impact the region amid
underlying very dry fuels. Continuing through Day 3/Sunday and Day
4/Monday, deep boundary layer mixing amid continued above normal
temperatures (and dry RHs falling to near 15-20%) will support
southerly winds sustained at 15-20 mph at the surface. Thus, 40%
Critical probabilities have been introduced for Day 4/Monday and Day
5/Tuesday over portions of southern KS, western OK, and the TX
Panhandle.
...Northwest, Northern Great Basin, and Northern California...
Drier southwest flow aloft associated with perpetual troughing over
the northwest CONUS will promote continued fire weather concerns
into early next week. 40% Critical probabilities have been
maintained with minor adjustments for Day 4/Monday and Day 5/Tuesday
over northeastern California, northwestern Nevada, and southeastern
Oregon. West to southwest sustained winds of 15-20 mph and afternoon
RHs near 15-20% will bring near-daily elevated fire weather concerns
to this region. Well below normal temperatures will moderate the
threat slightly, but conditions will remain conducive to wildfire
spread until accumulating precipitation occurs.
..Stearns.. 08/28/2026
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