290
FNUS22 KWNS 201801
FWDDY2
DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0100 PM CDT WED AUG 20 2025
VALID 211200Z - 221200Z
THE ISODRYT AREA WAS EXPANDED BASED ON THE LATEST HIGH-RESOLUTION
FORECAST GUIDANCE. HIGH-BASED SHOWERS AND THUNDERSTORMS MAY BE
ONGOING TOMORROW MORNING OVER PORTIONS OF NORTHERN UTAH INTO
WESTERN/CENTRAL WYOMING. HIGH-BASED SHOWERS AND THUNDERSTORMS MAY
CONTINUE OVERNIGHT FROM EAST-CENTRAL NEVADA THROUGH CENTRAL UTAH AS
WELL.
LOCALLY ELEVATED CONDITIONS ARE LIKELY ACROSS SWATHS OF THE GREAT
BASIN INTO WYOMING AND COLORADO DUE TO HOT/DRY/BREEZY CONDITIONS IN
PRE/POST-FRONTAL ENVIRONMENTS. ADDITIONALLY, A THERMAL TROUGH WILL
STRENGTHEN OVER THE WEST COAST TOMORROW WITH HOT/DRY/UNSTABLE AND
LOCALLY BREEZY CONDITIONS EXPECTED FROM SOUTHERN CALIFORNIA INTO THE
PACIFIC NORTHWEST, WEST OF THE CASCADES.
..NAUSLAR.. 08/20/2025
PREV DISCUSSION
/ISSUED 0157 AM CDT WED AUG 20 2025/
..SYNOPSIS
THE STRONG RIDGE OVER THE WESTERN US IS EXPECTED TO CONTINUE TO
BREAK DOWN UNDER THE SHORTWAVE TROUGH PASSING THROUGH THE NORTHERN
ROCKIES. THIS WILL SUPPORT CONTINUED ADVECTION OF MONSOON MOISTURE
NORTHWARD INTO THE GREAT BASIN AND PARTS OF SOUTHERN CALIFORNIA. BY
THURSDAY AFTERNOON, PWAT VALUES ARE LIKELY TO BE BETWEEN 0.5-0.8"
WITH A DRY SUB-CLOUD LAYER AND STEEP LOW-LEVEL LAPSE RATES. DESPITE
SLOWER STORM MOTIONS AND ISOLATED COVERAGE OVER UTAH AND PARTS OF
NEVADA, LITTLE WETTING RAINFALL IS EXPECTED. THIS SHOULD SUPPORT
ISOLATED DRY THUNDERSTORM POTENTIAL THE UNDER THE UPPER HIGH AND
INTO PORTIONS OF EASTERN IDAHO AND WESTERN WYOMING. WITH DRY FUELS
IN PLACE, SOME LIGHTNING IGNITIONS ARE POSSIBLE.
IN ADDITION TO THE POTENTIAL FOR THUNDERSTORMS, VERY WARM AND
UNSTABLE CONDITIONS ARE EXPECTED ON THE PERIPHERY OF THE DEEPER
MONSOON MOISTURE SURGE OVER PARTS OF THE SOUTHERN GREAT BASIN AND
SOUTHERN CALIFORNIA. STEEP MID-LEVEL LAPSE RATES AND MARGINAL
BUOYANCY WILL SUPPORT UNSTABLE CONDITIONS OVER MUCH OF THE
SOUTHWEST. THIS COULD SUPPORT PLUME DOMINATED FIRE GROWTH AND
PYROCONVECTION NEAR LARGE ACTIVE FIRES, WITH LOCALIZED EXTREME FIRE
BEHAVIOR POSSIBLE.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page