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U.S. Day 1 Fire Weather Outlook

   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 090656

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0156 AM CDT Wed Jul 09 2025

   Valid 091200Z - 101200Z

   ...CRITICAL FIRE WEATHER AREA FOR CENTRAL NEVADA INTO WESTERN
   UTAH...

   ...Synopsis...
   A compact midlevel trough will advance eastward across the northern
   Great Basin during the day. At the same time, a separate large-scale
   trough will move eastward across western Canada.

   ...Great Basin...
   Preceding the compact midlevel trough, moderate deep-layer
   southwesterly flow will overspread the Great Basin during peak
   heating. Deep boundary-layer mixing into this strengthening flow
   aloft will result in an expansive area of lower-teens RH and 20-25
   mph sustained west-southwesterly surface winds. Given increasingly
   dry fuels across the region, critical fire-weather conditions are
   expected from central NV into western UT (with elevated conditions
   surrounding this area across the Great Basin).

   ...Northwest...
   Large-scale ascent accompanying the compact midlevel trough will aid
   in isolated to widely scattered thunderstorm development over
   southeastern OR, southwestern ID, and far northeastern CA during the
   afternoon/evening hours. Deep inverted-V soundings and 0.5-0.7 inch
   PW will favor dry thunderstorms -- with a risk of lightning-induced
   ignitions and strong/erratic outflow winds. 

   Additionally, strong westerly flow in the base of the large-scale
   trough moving across western Canada will persist across the
   Cascades. Despite slightly higher RH than previous days, strong
   downslope/westerly surface winds will favor elevated to locally
   critical fire-weather conditions in the Columbia Basin.

   ..Weinman.. 07/09/2025

U.S. Day 2 Fire Weather Outlook

ZCZC SPCFWDDY2 ALL FNUS22 KWNS 090656 Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0156 AM CDT Wed Jul 09 2025 Valid 101200Z - 111200Z ...Synopsis... Along the northern periphery of a large-scale ridge over the Southwest, a midlevel shortwave trough will move eastward from the Great Basin into the central Rockies. Enhanced westerly flow aloft accompanying this feature will overspread a deeply mixed boundary layer during the afternoon. As a result, an expansive area of 15 percent RH and 15-20 mph sustained westerly surface winds will favor elevated to locally critical fire-weather conditions across the Four Corners region. ..Weinman.. 07/09/2025

U.S. Day 3-8 Fire Weather Outlook

   ZCZC SPCFWDD38 ALL
   FNUS28 KWNS 082149

   Day 3-8 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0449 PM CDT Tue Jul 08 2025

   Valid 101200Z - 161200Z

   ...Day 3/Thursday...
   A mid-level short wave with associated stronger deep layer westerly
   flow will bring a fire weather threat to a corridor from the Arizona
   Strip to the Western Slope. The stronger westerly flow in concert
   with a dry/well-mixed boundary layer will promote a dry and breezy
   setup amid an increasingly dry fuelscape. 

   ...Days 4-8/Friday-Tuesday...
   Model guidance consensus indicates a broad mid-level ridge centroid
   slowly propagating westward from AZ on Day 3/Thursday to off the
   southern CA coast by Day 7/Monday. Primary impact will be increasing
   temperatures to above seasonal normals along with dry conditions
   across the majority of the West, aiding in drying of fuels. Stronger
   west-northwesterly flow across the Northern Tier states could
   provide for elevated surface winds at times, but overlap of a low
   relative humidity/dry fuel environment is not likely with the
   exception of southern ID/Snake River Plain over the weekend (Days
   5-6/Saturday-Sunday). Overall thunderstorm threat will be limited to
   the eastern U.S. (along and east of the Continental Divide) through
   early next week.

   ..Williams.. 07/08/2025

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