686
FNUS22 KWNS 231949
FWDDY2
DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0248 PM CDT WED JUL 23 2025
VALID 241200Z - 251200Z
..CRITICAL FIRE WEATHER AREA FOR PORTIONS OF NORTHERN CALIFORNIA
..UPDATE
A CLOSED UPPER LOW MOVING ONSHORE NEAR CENTRAL CA AND STATIONARY
BOUNDARY WILL LEAD TO A MIX OF DRY/WET SCATTERED THUNDERSTORM
DEVELOPMENT THURSDAY AFTERNOON THROUGH THURSDAY EVENING. THE HIGHEST
THUNDERSTORM COVERAGE IS EXPECTED ACROSS NORTHERN CA AND SOUTHERN
OR, WITH LOWER COVERAGE EXTENDING EASTWARD ALONG THE BOUNDARY AS FAR
AS WESTERN WY. FORECAST SOUNDINGS FROM NEAR THE NORTHERN SIERRA
EASTWARD WITHIN THIS REGION SUGGEST A WELL MIXED BOUNDARY LAYER AND
PWATS GENERALLY LESS THAN 0.75". THIS, COMBINED WITH RECEPTIVE
FUELS, WILL SUPPORT DRY LIGHTNING STRIKES THURSDAY. A SMALL AREA OF
SCATTERED DRY THUNDERSTORMS HAS BEEN INTRODUCED INTO THE FORECAST
NEAR THE MODOC PLATEAU AND MOUNTAINS OF NORTHERN CA. THIS APPEARS TO
BE THE MOST LIKELY AREA WHERE A HIGHER DENSITY OF LIGHTNING STRIKES
WILL BE JUXTAPOSED WITH LOWER QPF AMOUNTS.
..BARNES.. 07/23/2025
PREV DISCUSSION
/ISSUED 0208 AM CDT WED JUL 23 2025/
..SYNOPSIS
FOR THURSDAY, THE UPPER LOW OFF THE CALIFORNIA COAST WILL BECOME
MORE COMPACT AND MOVE INLAND. AN UPPER TROUGH WILL ALSO BEGIN TO DIG
INTO THE NORTHWEST, INCREASING MID-LEVEL WINDS ACROSS THE CASCADES
THROUGH THE DAY. AT THE SURFACE, DEEPER TROUGHS WILL BE PRESENT IN
THE COLUMBIA BASIN AND NORTHWEST NEVADA. A BOUNDARY WILL BE SITUATED
ROUGHLY WITHIN THE NORTHERN GREAT BASIN INTO THE CA/OR BORDER.
..NORTHERN CALIFORNIA...SOUTHERN OREGON...NORTHERN GREAT BASIN
AS THE UPPER LOW MOVES INLAND, PWAT VALUES ARE EXPECTED TO RISE.
THIS, COUPLED WITH THE MID-LEVEL ASCENT AND LIFT FROM THE BOUNDARY,
WILL LEAD TO WIDELY SCATTERED STORMS ALONG THE BOUNDARY. STORM
COVERAGE MAY APPROACH SCATTERED IN NORTHERN CALIFORNIA. WITH
SLIGHTLY FASTER STORM MOTIONS THAN ON WEDNESDAY, THERE STILL WILL BE
SOME CHANCE FOR A FEW DRIER STORMS. GIVEN THE LIGHTNING OVER DRY
FUELS, NEW IGNITIONS WILL AGAIN BE POSSIBLE.
..COLUMBIA BASIN
LOCALLY ELEVATED FIRE WEATHER APPEARS POSSIBLE DURING THE AFTERNOON,
PARTICULARLY WITHIN THE CASCADE GAPS AND COLUMBIA GORGE. WIND SPEEDS
WITHIN THE GAPS COULD BE AROUND 20 MPH WITH RH RANGING FROM
POTENTIALLY IN THE TEENS BUT MORE LIKELY 20-25%. IT WILL BE DRIER IN
THE BASIN ITSELF (15-20% RH), BUT WINDS WILL BE LIGHTER (15-20 MPH).
GIVEN THE RECENT RAINFALL AND SUBSEQUENT DECREASE IN ERCS, ELEVATED
HIGHLIGHTS DO NOT APPEAR WARRANTED AT THIS TIME.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
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