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FNUS22 KWNS 081958

FWDDY2



Day 2 Fire Weather Outlook  

NWS Storm Prediction Center Norman OK

0258 PM CDT Mon Sep 08 2025



Valid 091200Z - 101200Z



...Washington Cascades and Columbia Basin...

An upper-level trough moving into the Northwestern U.S. will support

a conducive thunderstorm environment through tonight into the early

Day 2 period, with thunderstorms likely ongoing by Tuesday morning.

Limited rainfall from thunderstorms could bring additional ignitions

to portions of the Columbia Basin where ERCs are still in the

80-90th percentile range. Precipitation associated with

thunderstorms across the Washington Cascades will be higher in

heavier cores but denser canopies may inhibit moisture penetration

into understory fuels, inviting some ignition potential from

lightning on the fringes of heavier rain cores. Otherwise, previous

forecast (see below) remains on track.



..Williams.. 09/08/2025



.PREV DISCUSSION... /ISSUED 1239 AM CDT Mon Sep 08 2025/



...Synopsis...

With the upper-level trough shifting eastward into more of the Great

Basin, the strongest surface winds will also shift farther east on

Tuesday. Thunderstorms will remain possible in the northern Rockies.





...Great Basin...

Southern into east-central Nevada and western Utah will likely be

underneath and intensifying mid-level jet. Winds of 15-20 mph

(locally 25 mph) will overlap 15-20% RH. RH will be somewhat

uncertain given the potential for mid/high level clouds. With recent

rainfall and less receptive fuels, only locally elevated conditions

are expected.



...Northern Rockies...

Some thunderstorm activity is possible early Tuesday in Idaho. This

activity will spread into more of western Montana. Additional

thunderstorms may develop by afternoon farther east in Montana as

well. With the current state of fuels suggesting marginal dryness

and higher PWAT values, limited risk for lightning ignitions is

currently expected.



...Please see www.spc.noaa.gov/fire for graphic product...



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