070
FNUS21 KWNS 301656
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1155 AM CDT MON JUN 30 2025
VALID 301700Z - 011200Z
..NORTHERN CALIFORNIA AND SOUTHWESTERN OREGON
AN APPROACHING MID-LEVEL TROUGH, STEEP LOW-LEVEL LAPSE RATES AND
INCREASING MID-LEVEL MOISTURE AND INSTABILITY WILL AID A MIX OF
WET/DRY THUNDERSTORM DEVELOPMENT ACROSS THE HIGHER TERRAIN OF
NORTHERN CALIFORNIA, WITH SHOWERS AND THUNDERSTORMS PROPAGATING INTO
SOUTHERN OREGON ALONG AND EAST OF THE CASCADES THROUGH THIS EVENING.
ISOLATED DRY THUNDERSTORM HIGHLIGHTS PERSIST WHERE NEW IGNITIONS ARE
POSSIBLE ATOP DRY FUELS.
..GREAT BASIN
THE MID-LEVEL TROUGH ENTERING CALIFORNIA AND ASSOCIATED STRONGER
SOUTHERLY MID-LEVEL FLOW WILL OVERSPREAD THE GREAT BASIN TODAY. A
DEEP, WELL-MIXED BOUNDARY LAYER WILL FACILITATE GUSTY SURFACE WINDS
FROM THE SOUTH OF UP TO 25 MPH ACROSS CENTRAL NEVADA, WITH SUSTAINED
WINDS OF AROUND 15 MPH. THE ENHANCED WINDS ALONG WITH LOW RELATIVE
HUMIDITY WILL PROMOTE AN ELEVATED FIRE WEATHER THREAT AMID RECEPTIVE
FUELS.
..WILLIAMS.. 06/30/2025
PREV DISCUSSION
/ISSUED 0215 AM CDT MON JUN 30 2025/
..SYNOPSIS
ACROSS THE US, SUB-TROPICAL RIDGING WILL BUILD OVER THE PLAINS,
KEEPING STRONGER FLOW ALOFT DISPLACED TO THE NORTH WHILE AN UPPER
LOW WILL OVERSPREAD PORTIONS OF THE WEST COAST. AHEAD OF THE LOW,
BREEZY SOUTHERLY WINDS WILL ADVECT MONSOON MOISTURE NORTHWARD INTO
PARTS OF CA AND OR. DRY THUNDERSTORMS AND DRY/BREEZY CONDITIONS
APPEAR LIKELY TO SUPPORT ELEVATED FIRE-WEATHER POTENTIAL ACROSS THE
NORTHWEST AND GREAT BASIN TODAY.
..NORTHWEST
WEAK ASCENT FROM AN APPROACHING UPPER TROUGH WILL ALLOW FOR ISOLATED
TO WIDELY SCATTERED THUNDERSTORMS ACROSS NORTHERN CA AND SOUTHERN OR
THROUGH TONIGHT. STRONG HEATING AND DRY SUB-CLOUD LAYERS WITH STEEP
LAPSE RATES BELOW 500MB WILL SUPPORT A MIXED WET/DRY THUNDERSTORM
ENVIRONMENT CAPABLE OF OCCASIONAL DRY LIGHTNING STRIKES.
ADDITIONALLY, ERRATIC OUTFLOW WINDS ARE LIKELY NEAR STORMS. THE
INCREASED POTENTIAL FOR DRY LIGHTNING ATOP RECEPTIVE FUELS, WARRANTS
CONTINUATION OF ISODRYT PROBABILITIES WHERE FIRE STARTS ARE
POSSIBLE.
..GREAT BASIN
BENEATH THE UPPER RIDGE, VERY HOT SURFACE TEMPERATURES ARE EXPECTED
OVER PARTS OF NV AND WESTERN UT. SOUTHERLY SURFACE WINDS MAY GUST TO
15-20 MPH THROUGH THE AFTERNOON, CONCURRENT WITH WIDESPREAD RH
VALUES BELOW 15%. THE PRESENCE OF BREEZY LOW-LEVEL WINDS AND THE
HOT/DRY CONDITIONS WILL OVERLAP WITH A PROGRESSIVELY DRIER AND
RECEPTIVE FUELS ACROSS NV. THIS COULD SUPPORT A FEW HOURS OF
ELEVATED FIRE-WEATHER POTENTIAL THROUGH THIS EVENING.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
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