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FNUS22 KWNS 191954

FWDDY2



Day 2 Fire Weather Outlook  

NWS Storm Prediction Center Norman OK

0253 PM CDT Fri Sep 19 2025



Valid 201200Z - 211200Z



...Columbia Basin...

Increasing west/southwest flow aloft ahead of the next Pacific

Northwest mid-level trough as well as an increasing onshore pressure

gradient will promote enhanced downslope winds leeward of the

Cascades and into the Columbia Basin Saturday. Breezy winds of 10-15

mph (localized Cascade gap winds of 20 mph) and relative humidity as

low as 10% amid dry fuels will support an elevated fire weather

threat for the Columbia Basin. No significant changes were made to

the existing Elevated highlight area.



..Williams.. 09/19/2025



.PREV DISCUSSION... /ISSUED 0127 AM CDT Fri Sep 19 2025/



...Synopsis...

Elevated fire-weather conditions are forecast across portions of the

northern Cascades as a mid-level trough approaches the Pacific

Northwest. Otherwise, generally weak surface winds across the U.S.

and higher precipitable water content where convection is expected

will diminish any widespread fire-weather concerns. 



...Northern Cascades... 

Ridging and an intensifying height gradient aloft from an

approaching mid-level trough will result in some downslope westerly

surface winds through the Cascade gaps. These winds are expected to

reach 15-20 MPH, with relative humidity values as low as 10-15%.

With ERCs hovering around the 80th annual percentile, and some

additional curing of fuels expected on Friday, at least Elevated

fire-weather highlights are warranted at this time. 



...Southern Cascades...

Some potential for thunderstorm activity exists Saturday evening

across portions of the Oregon Cascades. However, precipitable water

content at or exceeding 1 inch, slow storm motions, low buoyancy,

and meager fuels will limit the overall threat of lightning-based

ignitions.



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



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