683
FNUS28 KWNS 172157
FWDD38

Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0455 PM CDT Thu Jul 17 2025

Valid 191200Z - 251200Z

...Days 3-5/Saturday-Monday...
A mid-level trough and attendant dry cold front will move through
the Pacific Northwest on Day 3/Saturday. Robust onshore flow will
persist across the Cascades, bringing breezy conditions to the
Columbia Basin. Despite cooler post-frontal temperatures, sustained
west winds of around 15 mph (20 mph in favored Cascade gaps) and
relative humidity as low as 15 percent will support a fire weather
threat amid dry fuels across the Columbia Basin. Enhanced mid-level
flow at the base of the trough overrunning a dry boundary layer in
place across southern Idaho will bring stronger winds to the Snake
River Plain Day 3/Saturday, raising wildfire spread potential within
critically dry fuels. A deepening, positively-tilted trough across
the Pacific Northwest and increase in mid-level winds will support a
broader area of dry southwesterly flow across the Great Basin, NV
and southern ID by Day 4/Sunday, with the fire weather threat
shifting southeastward to include northwestern UT by Day 5/Monday.
The trough will also aid in pushing residual monsoon moisture and
thunderstorm development currently across portions of the
Intermountain West along and east of the Continental Divide by early
next week, while also mitigating fire weather concerns for the
Pacific Northwest as cooler temperatures, cloud cover and higher
relative humidity move into the region.

...Days 6-8/Tuesday-Thursday...
Long term ensemble guidance indicates some form of mid-level
troughing persisting across the Pacific Northwest through the middle
of next week, maintaining a dry southwesterly flow over much of the
interior of the West. However, relaxing mid-level flow and reduced
surface pressure gradients as a subtropical high propagates westward
across the southern U.S. should promote lighter winds across the
Southwestern U.S., particularly for Days 7-8/Wednesday-Thursday.

..Williams.. 07/17/2025

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

$$