ZCZC SPCFWDDY2 ALL
   FNUS22 KWNS 190709

   Day 2 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0209 AM CDT Thu Jun 19 2025

   Valid 201200Z - 211200Z

   ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE GREAT BASIN INTO THE
   SOUTHWEST...

   ...Synopsis...
   A robust midlevel low will advance eastward across the Northwest
   during the day, while a swath of strong deep-layer westerly flow
   overspreads much of the western CONUS. In response, surface low
   pressure will deepen over the northern Great Basin, promoting a
   tightening pressure gradient across the Great Basin into the
   Southwest. This large-scale pattern will support widespread critical
   fire-weather conditions across the Great Basin into the Southwest. 

   ...Great Basin into the Southwest...
   Strong diurnal heating amid a dry antecedent air mass will support
   another day of widespread single-digit RH across the region. At the
   same time, deep boundary-layer mixing into the strong flow aloft,
   combined with the tightening pressure gradient, will yield an
   expansive area of 20-30 mph sustained southwesterly surface winds.
   Given increasingly dry fuels across much of the Great Basin into the
   Southwest, widespread critical fire-weather conditions are expected,
   with localized extremely critical conditions possible over
   terrain-favored areas. 

   ...Southern CA into the San Joaquin Valley...
   Deep-layer west-northwesterly flow on the upstream-side of the
   midlevel low will overspread central and southern CA, where the
   tight regional pressure gradient will be in place. This will promote
   breezy/gusty surface winds primarily over the interior mountains and
   valley -- where 15-20 percent RH is expected. These dry/breezy
   conditions will favor elevated fire-weather conditions where fuels
   are receptive to wildfire spread.

   ..Weinman.. 06/19/2025

      

   ZCZC SPCFWDD38 ALL
   FNUS28 KWNS 182158

   Day 3-8 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0458 PM CDT Wed Jun 18 2025

   Valid 201200Z - 261200Z

   ...Day 3-4/Friday-Saturday...
   An upper-level low entering the Pacific Northwest on Day 3/Friday
   with accompanying strong mid-level jet and tightening surface
   pressure gradient will promote strong southwest surface winds across
   much of the Great Basin, Four Corners and parts of the Upper
   Colorado Basin. 70 percent probabilities for Critical fire weather
   conditions were maintained for northwestern Nevada as well as much
   of southern Utah, northern Arizona and far western Colorado.
   Confidence remains quite high for an expansive fire weather threat
   amid an increasingly dry fuelscape. A cold front ushering in cooler
   temperatures and higher relative humidity will mitigate fire weather
   concerns across northwestern Nevada but mid-level jet positioning
   will continue to promote strong southwest winds across northern
   Arizona and much of Utah into western Colorado Day 4/Saturday. In
   addition, dry, post-frontal winds in the Central Valley and adjacent
   foothills combined with dry fuels will support some fire weather
   threat on Day 4/Saturday.

   ...Day 5-8/Sunday-Wednesday...
   Upper-level trough is expected to remain over the western U.S.
   through early next week keeping at least modest southwest flow over
   much of northern Arizona, southern Utah and Four Corners area. A
   very dry boundary layer along with dry fuels will maintain elevated
   wildfire spread potential early next week. Ensemble model guidance
   suggests a transition to a muted zonal flow pattern by midweek
   across CONUS, mitigating fire weather concerns in terms of winds
   across the much of the Western U.S. beginning midweek.

   ..Williams.. 06/18/2025