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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 301608
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1108 AM CDT Sun Aug 30 2026
Valid 301700Z - 311200Z
No changes were made to the Elevated wind/RH area over the southern
Plains as the forecast remains on track as was previously described.
An area of Isolated Dry Thunderstorms was introduced over portions
of the northern High Plains. Lift from both terrain and dynamic
forcing from a mid-level jet streak will impact the area this
afternoon amid limited, but sufficient, moisture (precipitable water
values near 0.5-0.7") and instability (100-300 J/kg CAPE).
High-based and fast moving (30+ kts storm motion) storms amid a dry
and windy sub-cloud layer will support a lightning ignition risk
this afternoon. While the highest coverage of storms is anticipated
to remain north and south of the drawn area, the risk of dry
thunderstorm activity from central WY into far southwest SD will
exceed 10% over very dry fuels. See our Day 1 Convective Outlook for
more details on coincident/nearby severe wind concerns.
..Stearns.. 08/30/2026
.PREV DISCUSSION... /ISSUED 1230 AM CDT Sun Aug 30 2026/
...Synopsis...
Moderate to strong mid-level flow across parts of the
central/northern High Plains will promote a surface trough from the
northern Plains southward into the southern High Plains. Near this
trough, strong heating and mixing will allow RH to drop to around
20-25% from the Texas Panhandle into western Oklahoma and
south-central Kansas. Modestly enhanced winds just above the surface
will help drive 15-20 mph winds (with stronger gusts) across these
areas. Areas of drought-stressed fuels will continue to support the
development of elevated fire weather concerns during the afternoon.
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 301945
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0245 PM CDT Sun Aug 30 2026
Valid 311200Z - 011200Z
Minor changes were made to the existing Elevated area over far
northeastern CA and south-central OR. The latest forecast guidance
has maintained 15-20 mph southwest surface winds amid 10-20% minimum
RH across the drawn area. While coincident elevated winds and low
RHs may persist slightly farther east into the western Great Basin,
recent rainfall and cool temperatures have reduced fuels below
critical thresholds for now over much of NV.
Meanwhile, the trough axis progressing across the northern tier of
the CONUS on Day 2/Monday will lead to elevated westerly winds near
15-20 mph amid low RHs down to 20-25% over portions of western ND
and nearby areas. However, fuels remain marginally receptive
(especially given preceding precipitation possible on Day 1/Sunday)
across this area, leading to more of a curing event than an
immediate wildfire risk. Given the continued above normal
temperatures amid drier than normal conditions and periodic wind
events, this region will be watched closely as troughing continues
to impact the northern portion of the CONUS.
..Stearns.. 08/30/2026
.PREV DISCUSSION... /ISSUED 1231 AM CDT Sun Aug 30 2026/
...Synopsis...
A broad trough will persist across much of the West on Monday. A
compact shortwave trough will move through the Great Basin through
the day. In its wake, mid-level flow will relax before quickly
increasing again into Tuesday morning. At the surface, a broad and
modest surface trough will develop within the Northwest into the
northern Great Basin. A small zone of favorable overlap of 15-20 mph
winds with marginally lowered RH (15-20%) is forecast from northeast
California into south-central Oregon. Here, marginally elevated fire
weather concerns will exist during the afternoon given the very dry
fuels.
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 302144
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0444 PM CDT Sun Aug 30 2026
Valid 011200Z - 071200Z
...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 throughout much of the forecast. 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 Midwest US. This will deflect monsoonal moisture
to the south and east, but advect additional moisture onshore from
the eastern Pacific. The general consensus does favor continued well
below normal temperatures across the western third of the CONUS much
of the week along with increasing likelihood for multiple days of
accumulating rainfall over a good portion of the Pacific Northwest.
...Northwest, Northern Great Basin, and Northern California...
Dry southwest flow aloft associated with continual troughing over
the northwest CONUS will promote at least one more day of fire
weather concerns into mid-week. 40% Critical probabilities have been
maintained with minor adjustments for Day 3/Tuesday over
northeastern CA, northwestern NV, and southeastern OR. West to
southwest winds of 15-20 mph amid afternoon RH of 10-20% will
continue elevated fire weather concerns over this region. Below
normal surface temperatures will moderate the threat slightly, but
conditions will remain conducive to wildfire spread until a
significant precipitation event occurs. Increasing potential for
accumulating (widespread wetting) rainfall is introduced mid-week
over much of the Pacific Northwest.
...Central and Eastern Wyoming...
Persistent above normal temperatures and strengthening drought
conditions continue to promote fuel curing across central WY into
portions of the western Dakotas and far southeastern MT. These
antecedent conditions will combine with westerly winds (sustained at
15-20 mph) as trough passages continue, to result in at least
elevated wind/RH (minimums near 15-20%) combinations over this
region. Both ERCs and BIs will climb above their respective
90th-95th percentiles, indicating fuels receptivity is reaching
critical levels across the region where not hampered by significant
green up. Thus, the 40% Critical wind/RH probability was maintained
and expanded in areal extent slightly on Day 4/Wednesday with an
additional area introduced for some of the same region on Day
5/Thursday. Depending on the evolution of the upper-level troughs
that continue to progress across the northern CONUS, fire weather
concerns could persist into Day 6/Friday. However, forecast
certainty remains too low to introduce additional probabilities at
this time.
..Stearns.. 08/30/2026
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