681
FNUS21 KWNS 301634
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1133 AM CDT WED JUL 30 2025
VALID 301700Z - 311200Z
...CRITICAL FIRE WEATHER AREA FOR CENTRAL OREGON INTO EXTREME
NORTHERN CALIFORNIA AND EXTREME NORTHWESTERN NEVADA FOR SCATTERED
DRY THUNDERSTORMS...
...CRITICAL FIRE WEATHER AREA FOR SOUTHWESTERN UTAH FOR
WINDY...WARM...AND DRY CONDITIONS...
..UPDATE
A SLIGHT SOUTHWARD EXTENSION OF THE ISOLATED DRY THUNDERSTORM AREA
WAS MADE TO INCLUDE MORE OF THE NORTHERN SIERRA RANGE OF CA TODAY.
FARTHER EAST ACROSS SOUTHWESTERN UT, THE LATEST HI-RES MODEL TRENDS
SUGGEST THE DURATION OF SUSTAINED WIND SPEEDS OVER 20 MPH WILL
EXCEED 3 HOURS. THESE BREEZY CONDITIONS, COMBINED WITH RH AROUND 10%
THIS AFTERNOON JUXTAPOSED WITH RECEPTIVE FUELS, HAS LED TO AN
UPGRADE OF CRITICAL THERE. THE ELEVATED AREA WAS ALSO EXTENDED EAST
AND SOUTHEASTWARD OVER MORE OF NORTHWESTERN AZ AND SOUTH CENTRAL UT
FOR THE SAME REASONS. PLEASE SEE THE PREVIOUS DISCUSSION FOR
ADDITIONAL DETAILS.
..BARNES.. 07/30/2025
PREV DISCUSSION
/ISSUED 0155 AM CDT WED JUL 30 2025/
..SYNOPSIS
A MID-LEVEL TROUGH WILL MEANDER ALONG THE WEST COAST WHILE UPPER
RIDGING PERSISTS ACROSS THE CONUS EAST OF THE ROCKIES TODAY. A
PRONOUNCED MID-LEVEL IMPULSE WILL PIVOT AROUND THE MID-LEVEL TROUGH
AND MOVE NORTH ACROSS THE PACIFIC NORTHWEST THROUGH THE DAY. UPPER
SUPPORT FROM THIS GLANCING IMPULSE WILL ENCOURAGE DRY AND BREEZY
CONDITIONS ACROSS PORTIONS OF THE GREAT BASIN, AND SCATTERED
THUNDERSTORM DEVELOPMENT OVER THE PACIFIC NORTHWEST.
..GREAT BASIN
UPPER SUPPORT FROM THE GLANCING MID-LEVEL IMPULSE WILL SUPPORT 15+
MPH SUSTAINED SOUTHWESTERLY SURFACE WINDS AMID 15-20 PERCENT RH FOR
SEVERAL HOURS DURING THE AFTERNOON. THESE DRY AND BREEZY CONDITIONS
WILL OVERSPREAD FUEL BEDS THAT ARE RECEPTIVE TO FIRE SPREAD,
WARRANTING THE INTRODUCTION OF ELEVATED HIGHLIGHTS.
..PACIFIC NORTHWEST
MID-LEVEL MOISTURE WILL ALSO PIVOT AROUND THE UPPER TROUGH, WITH THE
AFOREMENTIONED MID-LEVEL IMPULSE ACTING AS A SOURCE OF ENHANCED LIFT
TO SUPPORT SEVERAL CLUSTERS OF HIGH-BASED THUNDERSTORMS BY MID
AFTERNOON ACROSS MUCH OF THE PACIFIC NORTHWEST, WARRANTING ISOLATED
DRY THUNDERSTORM HIGHLIGHTS. FORECAST SOUNDINGS DEPICT INVERTED-V
PROFILES ON A WIDESPREAD BASIS ACROSS EXTREME NORTHWEST NEVADA,
EXTREME NORTHERN CALIFORNIA, AND MUCH OF CENTRAL OREGON, INCLUDING
IN SOME REGIONS WEST OF THE CASCADES. THE PASSAGE OF THE MID-LEVEL
IMPULSE MAY ALSO SUPPORT FASTER STORM SPEEDS, AND SOME OF THE
STRONGER STORMS MAY EVEN PRODUCE ERRATIC WIND GUSTS. THE EXPECTATION
FOR FASTER MOVING, HIGHER DENSITY CLUSTERS OF THUNDERSTORMS
OVERSPREADING VERY DRY FUELS NECESSITATES SCATTERED DRY THUNDERSTORM
HIGHLIGHTS.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
CLICK HERE TO GO TO PREVIOUS BULLETINS.
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