808 

FNUS21 KWNS 060705

FWDDY1



Day 1 Fire Weather Outlook  

NWS Storm Prediction Center Norman OK

0205 AM CDT Sat Jun 06 2026



Valid 061200Z - 071200Z



...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE GREAT BASIN AND

SOUTHWEST...



...Synopsis...

An intensifying upper trough over the Northwest is forecast to

spread eastward into the Northern Rockies and southern Canada today

and tonight. A lee low is forecast to deepen over the northern Great

Basin and northern MT before moving northward into southern Canada.

Stronger flow aloft will move southeastward, overspreading a dry and

hot air mass over much of the western US. This will promote

widespread elevated and critical fire-weather conditions atop dry

fuels from the Great Basin to the Southwest. Isolated dry

thunderstorms are also possible as moisture increases across the

central Rockies and High Plains.



...Great Basin and Southwest...

As the upper trough over the Northwest and northern Rockies

intensifies, two belts of stronger mid-level flow will overspread

portions of the Great Basin and central Rockies. This, along with an

enhanced surface pressure gradient from the deepening lee low in

northern MT will bolster surface winds to 20-30 mph from

northeastern NV southward into UT, northern AZ and western CO. In

combination with high temperatures and low RH of 10-20%, widespread

elevated and critical fire-weather conditions are expected amid a

dry fuelscape.



Locally critical conditions may also extend across northern and

western NV into far southern OR along the lee of the Sierras.

Several hours of gusty surface winds (20-25 mph) and RH below 20%

are expected this afternoon. However, less receptive fuels, owing to

greater rainfall in the past 2 weeks, suggests critical conditions,

while possible, will be more localized.



Weaker flow aloft across southern AZ and the Four Corners will still

promote widespread elevated conditions with 10-20% RH and surface

gusts of 15-25 mph. Potentially enhanced by local terrain, some

potential for brief critical conditions may develop given drying

fuels and increasing burn period duration.



...ID and Northern Rockies...

Ascent from the upper trough will impinge on the western edge of

modest surface moisture moving westward into the higher terrain near

the lee low and surface trough. This ascent and diurnal heating

could support isolated thunderstorm development across eastern ID

and far southwestern MT. Likely high-based, these fast-moving storms

would have limited precipitation efficiency and some potential for

drier strikes. However, forecast coverage is likely to remain sparse

and areas where storms are more likely to develop have fuels that

are less receptive to starts.



...Central High Plains...

As westerly flow aloft overspreads the Rockies, enhanced lee trough

will aide in marginal low-level moisture transport across the

central High Plains and Front Range. Isolated thunderstorms are

possible across parts of northern CO and southern WY and western NE.

Fast storm motions, and high cloud bases suggest these storms are

unlikely to support widespread rainfall. With pockets of drier fuels

present, isolated dry thunderstorms and lightning starts are

possible.



..Lyons.. 06/06/2026



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



$$