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U.S. Day 1 Fire Weather Outlook

   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 231639

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   1139 AM CDT Thu Jul 23 2026

   Valid 231700Z - 241200Z

   ...17z Update...
   The prior forecast remains valid with no changes. Isolated severe
   gusts are possible in and around where the Day 1 Marginal severe
   Risk overlaps with the Dry Thunderstorm probabilities. See the
   previous discussion for more information.

   ..Nauslar/Lyons.. 07/23/2026

   .PREV DISCUSSION... /ISSUED 1222 AM CDT Thu Jul 23 2026/

   ...Synopsis...
   Upper-level troughing will continue across the eastern U.S. as
   surface high pressure builds into the Ohio Valley. A long-lived
   upper ridge across the western U.S. will finally begin to flatten
   and break down owing to an approaching eastern Pacific upper trough.
   Within the last 24 hours, mixed wet/dry thunderstorms have traversed
   portions of central Oregon and the Cascades. Only localized areas
   received appreciable precipitation, not fully mitigating fuel
   concerns across the broader environment. Returning dry and windy
   conditions east of the Cascades will further enhance the fuelscape,
   encouraging lightning-induced ignitions to emerge and further
   exacerbating numerous wildfires across the region.

   ...Pacific Northwest and Northern Rockies...
   As upper-level flow transitions from broadly southerly to
   southwesterly, monsoonal moisture will be shunted northeastward as a
   dry airmass returns to the Inland Northwest. Daytime
   destabilization, ample mid-level moisture, and fast storm motions
   over the Columbia Basin into the Northern Rockies will promote
   isolated wet/dry thunderstorms. In addition, preceding days of hot
   and dry conditions has allowed fuels to approach critical
   thresholds, making the environment increasingly receptive to new
   ignitions. As upper level flow strengthens and impinges upon the
   Northwest, tightening surface pressure gradients along the Cascades
   will promote very gusty winds amid a dry boundary layer. Elevated
   highlights have been maintained where RH values will decline to less
   than 20% as winds increase to 15-20 mph (localized gusts up to 35
   mph in terrain-favored areas). Greater concern for new ignitions and
   impacts to ongoing fires exist where the Elevated and Isolated Dry
   Thunderstorm highlights overlap.

   ...Southern Plains...
   A mid-level shortwave trough will track across the High Plains this
   afternoon as a surface low emerges over the Oklahoma/Texas
   Panhandles. At peak heating, 15-20% RH will combine with
   southwesterly winds of 10-15 mph atop a mixed fuelscape. Pockets of
   cured grasses and ERCs approaching the 80-90th percentile will
   promote locally elevated fire concerns.
      

U.S. Day 2 Fire Weather Outlook


   ZCZC SPCFWDDY2 ALL
   FNUS22 KWNS 230525

   Day 2 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   1225 AM CDT Thu Jul 23 2026

   Valid 241200Z - 251200Z

   ...CRITICAL FIRE WEATHER AREA FOR NORTHEASTERN
   CALIFORNIA...NORTHWESTERN NEVADA...AND SOUTH-CENTRAL/SOUTHEASTERN
   OREGON...

   ...Synopsis...
   Upper-level ridging will begin to transition towards the central
   U.S. as eastern Pacific troughing approaches the Pacific Northwest.
   Meanwhile, troughing will persist across the eastern U.S. with
   several embedded shortwaves providing unsettled conditions in the
   Midwest and portions of the Southeast. 

   Enhanced southwesterly flow will overspread the Pacific Northwest,
   Northern Rockies, and the Montana Plains on Day 2/Friday, bringing
   hot, dry, and windy conditions to a mostly dry fuelscape. With
   preceding days of mixed wet/dry thunderstorms and abundant lightning
   being followed by such meteorological conditions, holdover ignitions
   are likely to emerge. Daytime RH values of less than 20% are
   expected to combine with southwest-westerly sustained winds of 15-20
   mph, warranting Elevated highlights. While some pockets of heavier
   rainfall from prior days thunderstorms may alleviate localized fuel
   concerns, the expansive environment is approaching, or has already
   reached, critical fuel thresholds. A Critical risk area was
   introduced across northeastern California, northwestern Nevada, and
   south-central/southeastern Oregon where 15-25 mph southwesterly
   winds and less than 15% RH will overlap 80-90th percentile ERCs.
   Critical winds/RH are likely to develop across portions of
   north-central and northeast Montana as well, but these conditions
   will likely act as more of a curing event.

   ..Elizalde-Garcia.. 07/23/2026


U.S. Day 3-8 Fire Weather Outlook


   ZCZC SPCFWDD38 ALL
   FNUS28 KWNS 222143

   Day 3-8 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0443 PM CDT Wed Jul 22 2026

   Valid 241200Z - 301200Z

   Upper-level troughing will develop over the Pacific Northwest into
   the northern Rockies late this week through the weekend. Mid-level
   southwest-westerly flow of 30-60 knots will overspread the region
   with a tightening onshore pressure gradient and lee troughing east
   of the Cascades and northern Rockies. The Four Corners High will
   likely slowly shift east-southeast towards the southern High Plains,
   with daily monsoonal thunderstorms remaining likely across the
   greater Four Corners region into early next week. 

   ...Northwestern US...
   Overall, a critical fire weather pattern will continue to unfold
   through the weekend across the northwestern US with lightning
   followed by hot, dry, and windy conditions. Elevated to critical
   fire weather conditions are expected across the Inland Northwest,
   northwest Great Basin, and extending through northern Montana Day
   3/Friday as west-southwest winds strengthen amid a drying and
   warming airmass. Critical winds/RH are likely to develop across
   portions of north-central and northeast Montana, but this will
   likely act more as a curing event. 

   Winds will strengthen on Day 4/Saturday across the Inland Northwest
   and into northwest Montana, with critical conditions expected again
   here and from south-central/southeast Oregon extending into
   northeast California, northwest Nevada, and southwest Idaho.
   Isolated to scattered mixed wet/dry thunderstorms are likely in
   portions of central Montana on Day 4/Saturday, but there remains too
   much uncertainty regarding the overlap of receptive fuels and drier
   thunderstorm development to include dry thunderstorm probabilities
   at this time. However, dry and breezy conditions are likely across
   portions of western/central Montana Day 4/Saturday. 

   Dry and breezy conditions will continue from the northwest Great
   Basin through central/southern Idaho into Montana on Day 5/Sunday
   and possibly Day 6/Monday. There remains forecast uncertainty
   regarding lingering dry and breezy conditions across portions of the
   Inland Northwest, and the likelihood of critical conditions in
   portions of the northwest Great Basin and northern Montana. Much of
   this depends on the evolution of the upper-level troughing over the
   northwest US. Another source of forecast uncertainty is how areas
   that currently have less receptive fuels in portions of northeast
   Nevada, central/eastern Idaho, and southwest Montana will respond to
   multiple consecutive days of hot, dry, and breezy conditions.

   ...Plains...
   Hot, dry, and breezy conditions will likely develop across portions
   of the Plains during the outlook period. Fuels, especially fine
   fuels, will begin to cure and perhaps rapidly. How this pattern
   affects these areas will continued to be monitored.

   ..Nauslar.. 07/22/2026
      




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