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FNUS21 KWNS 251647

FWDDY1



Day 1 Fire Weather Outlook  

NWS Storm Prediction Center Norman OK

1146 AM CDT Thu Jun 25 2026



Valid 251700Z - 261200Z



...Morning Update...

Good overnight humidity recoveries occurred across the Great Basin

and central Rockies owing to increased moisture advection and

widespread showers yesterday afternoon/evening. Overall, observed 24

hr precipitation does not exceed 0.30" (except in a few isolated

areas) likely due to deep sub-cloud layer extending above 3 km, as

shown by 00z soundings from LKN, BOI, SLC, and GJT. Isolated dry

thunderstorms alongside strong/severe outflow winds remain possible

this afternoon. See the previous discussion and the SPC Day 1

Convective Outlook for more information on severe potential. 



Across the Columbia Basin and central-northern NV, poor overnight

humidity recoveries have led to RH values of less than 25% this

morning. Current satellite imagery depicts increasing cloud cover

over parts of Washington and Oregon, forecast to expand this

afternoon as a westerly jet at the base of an incoming trough moves

overhead. As a result, RH may not quite reach widespread critical

thresholds, and daytime high temperatures will be 5-10 degrees below

average. However, sustained winds of 15-20 mph (gusts over 25 mph)

atop receptive fuels will maintain Elevated fire weather highlights.



..Elizalde-Garcia.. 06/25/2026



.PREV DISCUSSION... /ISSUED 0106 AM CDT Thu Jun 25 2026/



...Synopsis...

A sub-tropical moisture plume will continue to progress eastward

across the Interior West today. This feature will provide a focus

for both wet and dry thunderstorms from southeastern ID though the

western half of CO and northwest NM into northeast AZ and the

eastern 2/3 of UT. On the western fringe of this potential

thunderstorm activity, mid-level west/southwest flow will combine

with drier air, leading to a well-mixed boundary layer. Farther

north, closer to the incoming trough over the Pacific Northwest, a

cold front will tighten the surface pressure gradient leading to

southwest flow over dry fuels there.



...Great Basin, Southwest, and central Rockies...

Thunderstorm coverage, particularly over western CO, will likely be

greater than what occurred on Wednesday with slightly less

precipitable water available as moisture progresses farther inland.

However, given overnight rainfall and fuels becoming slightly less

dry, lightning ignition efficiency is likely to decrease going into

today across many of the areas covered by the Isolated Dry

Thunderstorm risk. Thus, the less favorable fuel conditions will

balance the somewhat more favorable atmospheric environment and

preclude any areas of potentially scattered dry thunderstorms. Given

the slightly drier vertical profiles and remaining sub-cloud dry

layer, any storms that do form will have potential for gusty outflow

winds. (See the SPC Day 1 Convective Outlook for additional

details.) Additionally, pyrocumulus development remains highly

possible with pyrocumulonimbus not out of the question if fire

activity can provide sufficient surface heating.



Over much of eastern NV and portions of western UT, southwest flow

aloft over hotter and drier surface conditions will lead to Elevated

wind/RH conditions. In this region, expect winds to be southwest to

westerly at 15-20 mph amid minimum RHs ranging from 10-20 percent.



...Pacific Northwest...

Farther northwest over WA and portions of OR east of the Cascades,

west to southwest flow will promote strong downslope winds and dry

conditions. Southwesterly sustained surface winds of 15-20 mph will

combine with 10-15% RH to support Elevated fire weather concerns

there as well. A cold front will push through the Columbia Basin

this evening into the overnight hours, bringing increased

precipitation chances and cooler temperatures.



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



$$