435
FNUS21 KWNS 170641
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0140 AM CDT MON AUG 17 2026
VALID 171200Z - 181200Z
..SYNOPSIS
UPPER-LEVEL RIDGING ACROSS THE WESTERN US WILL WEAKEN AS A TROUGH
DEEPENS ACROSS THE CANADIAN PRAIRIES. INCREASING WESTERLY FLOW
ACROSS THE NORTHERN PERIPHERY OF THE RIDGE WILL BRING AN INCREASE IN
SURFACE WINDS ACROSS PORTIONS OF NORTHERN CALIFORNIA AND THE GREAT
BASIN WITH DRY AND BREEZY CONDITIONS POSSIBLE.
..NORTHERN GREAT BASIN AND NORTHEAST CALIFORNIA
WARM AFTERNOON TEMPERATURES ARE FORECAST TO OVERLAP WITH BREEZY
SOUTHWESTERLY SURFACE WINDS ACROSS PORTIONS OF NORTHEASTERN
CALIFORNIA INTO NORTHERN NEVADA THIS AFTERNOON. RELATIVE HUMIDITY
REDUCTIONS TO 15-20% WILL OVERLAP WITH SUSTAINED WESTERLY WINDS
AROUND 10-15 MPH TO SUPPORT A FEW HOURS OF ELEVATED FIRE WEATHER
CONDITIONS. FUELS IN THIS REGION REMAIN CRITICALLY DRY, WITH LITTLE
TO NO RECENT RAINFALL.
..NORTHERN ROCKIES
ASCENT FROM THE TROUGH SWEEPING ACROSS THE NORTHERN ROCKIES INTO THE
NORTHERN PLAINS WILL BRING WIDELY SCATTERED THUNDERSTORM ACTIVITY
ACROSS PORTIONS OF THE NORTHERN ROCKIES THIS AFTERNOON. MOISTURE
WILL BE SHALLOW AND LIMITED, WITH PRECIPITABLE WATER VALUES AROUND
0.50-0.90". THIS IN COMBINATION WITH FASTER STORM MOTIONS MAY LEAD
TO LITTLE IN THE WAY OF WETTING RAINFALL. HOWEVER, SEVERAL DAYS OF
WETTING RAINFALL HAVE TEMPERED FUELS SUCH THAT DRY STORMS AND
LIGHTNING IGNITIONS ARE EXPECTED TO BE SPORADIC. SEVERAL NEW STARTS
HAVE BEEN NOTED ACROSS SOUTHWESTERN ID AND EASTERN OR. DEPENDING ON
THE TIMING AND LOCATION OF THE APPROACHING SHORTWAVE TROUGH, AN
ISOLATED THUNDERSTORM OVER DRY FUELS FURTHER SOUTH INTO IDAHO IS
POSSIBLE, ALBEIT LOW (5-10% CHANCE).
..THORNTON.. 08/17/2026
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
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