230
FNUS21 KWNS 041639
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1138 AM CDT MON AUG 04 2025
VALID 041700Z - 051200Z
...CRITICAL FIRE WEATHER AREA FOR PARTS OF THE GREAT BASIN INTO THE
CENTRAL ROCKIES...
A MINOR EXPANSION OF THE AREA DELINEATING POTENTIAL FOR ISOLATED DRY
THUNDERSTORMS WAS MADE INTO PARTS OF FAR NORTHERN NEVADA AND CENTRAL
OREGON. SOME POTENTIAL FOR SCATTERED DRY THUNDERSTORMS EXISTS WITHIN
THIS REGION, THOUGH CONFINED TO AREAS WHERE FUELS APPEAR MORE
MARGINALLY RECEPTIVE TO DRY LIGHTNING IGNITIONS.
THE BALANCE OF THE PREVIOUS FORECAST GENERALLY REMAINS ON TRACK.
BREEZY NORTHWEST WINDS ACROSS PORTIONS OF NORTHWEST CALIFORNIA MAY
RESULT IN BRIEF/LOCALIZED ELEVATED CONDITIONS. OTHERWISE, SEE THE
DISCUSSION BELOW FOR MORE DETAILS.
..KARSTENS.. 08/04/2025
PREV DISCUSSION
/ISSUED 0156 AM CDT MON AUG 04 2025/
..SYNOPSIS
ALONG THE NORTHWESTERN PERIPHERY OF A LARGE-SCALE RIDGE EXTENDING
FROM THE SOUTHWEST INTO THE NORTHERN PLAINS, A COMPACT/ROBUST
MIDLEVEL TROUGH WILL ADVANCE EAST-NORTHEASTWARD FROM THE NORTHWEST
INTO THE NORTHERN ROCKIES DURING THE DAY.
..GREAT BASIN INTO THE CENTRAL ROCKIES
BETWEEN THE LARGE-SCALE RIDGE AND MIDLEVEL TROUGH, A BELT OF
MODERATE DEEP-LAYER WEST-SOUTHWESTERLY FLOW WILL OVERSPREAD THE
GREAT BASIN INTO THE CENTRAL ROCKIES THROUGH THE AFTERNOON. HERE,
DEEP BOUNDARY-LAYER MIXING INTO THE ENHANCED FLOW ALOFT WILL FAVOR
WIDESPREAD SINGLE-DIGIT RH AND 15-25 MPH SUSTAINED
WEST-SOUTHWESTERLY SURFACE WINDS. THESE DRY/WINDY CONDITIONS WILL
LEAD TO CRITICAL FIRE-WEATHER CONDITIONS ACROSS MUCH OF UT AND
ADJACENT STATES, GIVEN VERY RECEPTIVE FUELS.
..DRY THUNDERSTORMS - INTERMOUNTAIN WEST/NORTHERN ROCKIES
STRONG/FOCUSED FORCING FOR ASCENT ACCOMPANYING THE MIDLEVEL TROUGH
WILL AID IN THUNDERSTORM DEVELOPMENT ACROSS MUCH OF THE
INTERMOUNTAIN WEST AND NORTHERN ROCKIES THROUGHOUT THE DAY. ALONG
THE SOUTHERN PERIPHERY OF DEEPER MIDLEVEL MOISTURE ACROSS PARTS OF
THE NORTHWEST INTO THE NORTHERN ROCKIES, ISOLATED HIGH-BASED
THUNDERSTORMS ARE EXPECTED IN AN AIR MASS CHARACTERIZED BY 0.60-0.75
INCH PW AND INVERTED-V SOUNDINGS. THIS WILL PROMOTE MOSTLY DRY
THUNDERSTORMS WITH A RISK OF LIGHTNING-INDUCED IGNITIONS AND
STRONG-SEVERE OUTFLOW WINDS. REFERENCE THE SPC DAY 1 CONVECTIVE
OUTLOOK FOR INFORMATION ON THE SEVERE RISK.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page