U.S. Alerts
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U.S. & Canada 00-UTC 48 Hour Surface Smoke Forecast
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U.S. Day 1 Fire Weather Outlook

   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 170653

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0153 AM CDT Sat Oct 17 2026

   Valid 171200Z - 181200Z

   ...Synopsis...
   A closed mid-level low will linger to the southwest of Southern
   California today as upper ridging transitions eastward into the
   Great Plains. This will continue to foster lingering offshore flow
   and elevated fire weather conditions across portions of Southern
   California today. Elsewhere, a strong cold front will continue to
   shift offshore of the Southeast as high pressure builds eastward
   into the Ohio River Valley. This will help maintain dry,
   post-frontal flow and elevated fire weather concerns across portions
   of the lower MS River Valley.

   ...Southern California...
   A closed mid-level low will remain positioned west of the northern
   Baja Peninsula, which will help maintain residual easterly offshore
   flow today. Generally easterly surface winds of 15-20 mph (locally
   up to 25 mph) will prevail this morning, with occasionally higher
   gusts in terrain favored locations. While RH values will decrease to
   around 15%-20% in the afternoon (locally lower), winds will be
   decreasing through the day as the offshore-directed pressure
   gradient relaxes. This will support lingering elevated fire weather
   conditions this morning and into early afternoon across the Simi
   Valley and Sierra Madre/San Rafael Ranges.

   ...Lower Mississippi River Valley...
   High pressure shifting eastward into the Ohio Valley coupled with a
   strong cold front progressing offshore of the Southeast will
   continue to support dry and breezy post-frontal conditions across
   the lower Mississippi River Valley. North-northeast surface winds of
   10-15 mph (with localized gusts of 20-25 mph) and minimum daytime RH
   values of around 25-30% atop receptive fuels (ERCs commonly above
   the 80-90th percentiles) will continue to foster elevated fire
   weather concerns from southern LA into southeastern AR and much of
   MS.

   ..Chalmers.. 10/17/2026
      

U.S. Day 2 Fire Weather Outlook


   ZCZC SPCFWDDY2 ALL
   FNUS22 KWNS 170655

   Day 2 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0155 AM CDT Sat Oct 17 2026

   Valid 181200Z - 191200Z

   ...NO CRITICAL AREAS...

   ...Synopsis...
   A closed mid-level low will remain positioned off of the East Coast
   on D2/Sunday as upper ridging lingers across the southern Plains and
   lower/mid Mississippi River Valley. Simultaneously, a robust
   mid/upper level shortwave trough will begin to approach the Pacific
   Northwest coastline. At the surface, high pressure will build into
   the northern Plains behind a southeastward-progressing cold front,
   while a second area of high pressure persists across the
   Mid-Atlantic. Recent widespread precipitation across much of the
   Intermountain West, Plains, and East will largely temper fire
   weather concerns across these regions.

   Dry and breezy conditions are forecast across portions the
   southern/central High Plains in advance of lee surface troughing and
   across portions of the Southeast, including central/northern Georgia
   and adjacent areas of South Carolina/Alabama along the southern
   periphery of surface high pressure to the north. Poor to marginal
   fuel conditions, recent rainfall across portions of these areas, and
   marginal wind speeds across the Southeast are expected to limit the
   overall fire weather threat across these regions at this time,
   however.

   Some 00z high-res guidance also suggests that southwesterly surface
   winds will begin to strengthen across portions of northeastern
   California, southern/southeastern Oregon, and northwestern Nevada
   Sunday afternoon in advance of the approaching shortwave trough.
   Guidance differs on the magnitude of sustained surface winds as well
   as minimum daytime RH reductions, however. Thus, confidence
   regarding an extended (3+ hour) overlap of elevated wind/RH criteria
   is low at this time, but locally elevated conditions may materialize
   should stronger sustained surface winds overlap lower RH values
   Sunday afternoon.

   ..Chalmers.. 10/17/2026


U.S. Day 3-8 Fire Weather Outlook


   ZCZC SPCFWDD38 ALL
   FNUS28 KWNS 162141

   Day 3-8 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0441 PM CDT Fri Oct 16 2026

   Valid 181200Z - 241200Z

   ...Synopsis...
   The upper pattern will remain fairly stagnant across the CONUS
   through early next week. Upper ridging will continue over the
   central U.S. as a cut-off low meanders along the Atlantic coast
   through Day 5/Tuesday. High pressure will build over the western
   Gulf coast, promoting warm and dry conditions where fuels are
   growing increasingly more receptive in the lower MS River Valley.
   However, lighter prevailing winds should keep fire weather concerns
   low.

   Farther west, an upper trough will impinge upon the Pacific
   Northwest on Day 4/Monday, increasing southwesterly flow over the
   Great Basin. Upper troughing will amplify as it digs into the Desert
   Southwest mid-week, potentially ejecting into the Great Plains by
   Day 7/Thursday. This pattern is expected to bring additional
   precipitation and generally unsettled conditions to much of the
   Intermountain West. 

   ...Day 4/Monday - Northeastern California and Northwest Great
   Basin...
   A robust mid/upper trough is expected to bring enhanced
   southwesterly flow back into the western U.S. by early next week.
   Dry and breezy conditions in advance of the trough will promote an
   increasing fire weather threat over northeastern CA, far
   southeastern OR and northwestern NV on Day 4/Monday where fuels
   remain dry in the absence of recent precipitation. Thus, 40%
   critical probabilities have been maintained across the region.

   ..Elizalde-Garcia.. 10/16/2026
      




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