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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 031530
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1030 AM CDT Sat Oct 03 2026
Valid 031700Z - 041200Z
No changes are needed for today's Fire Weather Outlook. The
previously mentioned Elevated offshore wind/RH conditions (easterly
10-15 mph gusting up to 40 amid 15-20% RH) remain on track for this
afternoon over the highlighted area of southern CA where ERCs hover
near the 70-90th percentile.
..Stearns.. 10/03/2026
.PREV DISCUSSION... /ISSUED 0100 AM CDT Sat Oct 03 2026/
...Synopsis...
Elevated fire-weather conditions are forecast today across Southern
California as an upper-level ridge contributes to dry, easterly
off-shore flow. Relative humidity is expected to reach as low as
15-20% across much of the area, coupled with 10-15 MPH winds.
Portions of the San Diego foothills may see gusts as high as 30-40
MPH. Given that these conditions will overlap with fuels in the
vicinity of the 70th-80th annual percentiles, Elevated fire-weather
highlights have been maintained for this afternoon.
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 031830
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0130 PM CDT Sat Oct 03 2026
Valid 041200Z - 051200Z
No changes are needed from the previous forecast. Offshore flow will
again be strongest through the mid to late morning hours. As surface
heating brings daytime temperatures well above normal and RHs fall
to 15-20%, 15-20 mph easterly winds will promote an Elevated fire
weather threat over coastal portions of southern CA.
..Stearns.. 10/03/2026
.PREV DISCUSSION... /ISSUED 0100 AM CDT Sat Oct 03 2026/
...Synopsis...
Easterly off-shore flow is forecast to continue into Sunday,
continuing Elevated fire-weather highlights for Southern California.
The previous day of dry and windy conditions will serve to further
cure the already dry fuels, bringing ERC fuel percentiles into the
90th-95th annual percentiles. Relative humidity of 15-20% and winds
of 10-15 MPH will support Elevated fire-weather conditions, though
the San Diego foothills may see gusts as high as 30-40 MPH.
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 032050
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0350 PM CDT Sat Oct 03 2026
Valid 051200Z - 111200Z
The upper-level high over the Intermountain West will be suppressed
as a shortwave trough moves onshore along the West Coast on Day
3/Monday. As this occurs, the right exit region of a jet streak
moving along the Canadian border will dip into northern MT, leading
to dry and even warmer conditions. The upper-level ridge will
undergo further suppression on Day 4/Tuesday and Day 5/Wednesday as
the aforementioned jet continues to dive southward along its
northeastern periphery. This pattern looks to fully break down the
high as yet another higher-amplitude trough approaches the West
Coast late next week. Forecast guidance currently indicates that
this system will introduce increased winds, but also usher in cooler
temperatures and precipitation chances. Regardless, after several
days of dry conditions and above-normal temperatures, the potential
for increased winds preceding moderated conditions late next week
will be monitored closely.
Over north-central MT on Day 3/Monday, westerly flow associated with
the aforementioned upper-level jet will increase surface winds on
the lee side of the Rocky Mountains and across much of central and
eastern MT. Well-above-normal to near-record temperatures on Day
3/Monday, amid widespread low afternoon minimum RHs (near 15-20%)
and breezy westerly winds (15-20 mph), will meet/exceed elevated
fire weather criteria. Meanwhile, given the warm and dry antecedent
conditions, fuels remain driest across portions of central MT, where
ERCs have risen to near the 80th percentile. Thus, a 40% probability
of Critical Fire Weather has been introduced over this region on Day
3/Monday.
..Stearns.. 10/03/2026
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