FNUS22 KWNS 021959

FWDDY2



Day 2 Fire Weather Outlook  

NWS Storm Prediction Center Norman OK

0258 PM CDT Wed Jul 02 2025



Valid 031200Z - 041200Z



...Northern Great Basin and Western Nevada...

An approaching short wave trough and stronger mid-level flow will

support shower and thunderstorm development across northeastern CA

into southeastern OR Thursday. Faster northeast thunderstorm

trajectories will limit precipitation amounts supporting an isolated

dry thunderstorm threat. A corridor of daytime instability and

precipitable water values of 0.5 to 0.7 inches will bring an

isolated dry thunderstorm threat to the higher terrain of far

northern NV, northern UT as well as far southeastern ID. The

incoming trough will also promote stronger downslope flow east of

the Sierra Crest across northwestern NV. Enhanced downslope winds

from the west of 15-20 mph and relative humidity of around 15%

supports continuation elevated fire weather highlights.



...Western Slope and Eastern Utah... 

A broad plume of monsoon moisture over the region along with daytime

heating will promote a mix of wet and dry thunderstorms over higher

terrain of the Western Slope as well as eastern UT. Some lightning

ignitions are possible within remaining pockets of receptive fuels.



..Williams.. 07/02/2025



.PREV DISCUSSION... /ISSUED 0227 AM CDT Wed Jul 02 2025/



...Synopsis...

Broad troughing over the western US will continue as a compact

shortwave trough moves across northern CA Thursday. 40-50 kt

westerly flow will overspread the northern Great Basin. This will

encourage dry downslope flow across parts of western NV. At the same

time, continued monsoon moisture will allow widespread showers and

thunderstorms over the Intermountain West.



...Northwest Great Basin...

Continued westerly flow aloft will overspread the northern Great

Basin Thursday afternoon. Dry downslope winds of 15-25 mph are

expected, aided by the increasing winds aloft. Very warm

temperatures, and the dry downslope trajectories, will support

widespread RH values below 15%. The increase in surface winds amid a

warm and dry boundary layer and dry fuels will support elevated

wildfire spread potential Thursday.



...Western Slope...

Another day of widespread showers and thunderstorms is expected

across the eastern Great Basin and western Rockies Thursday. A

continued surge of robust monsoon moisture (PWATS above 0.8 inches)

will support a mixed mode of wet and occasionally dry storms.

Widespread QPF of 0.1-0.25 inches in the preceding days suggest area

fuels are likely to become less receptive to lightning ignitions

with time. However, the coverage of storms does support at least

isolated potential for dry strikes in receptive fuels across western

CO/WY into eastern UT.



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



$$