696
FNUS21 KWNS 010620
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0119 AM CDT TUE JUL 01 2025
VALID 011200Z - 021200Z
..CRITICAL FIRE WEATHER AREA FOR SOUTHERN AND CENTRAL NEVADA
..SYNOPSIS
AN AMPLIFIED UPPER TROUGH SLOWLY PROGRESSING EASTWARD ACROSS CENTRAL
CALIFORNIA WILL BE RESPONSIBLE FOR SUPPORTING MIXED DRY/WET
THUNDERSTORMS ACROSS PORTIONS OF NORTHERN CALIFORNIA INTO SOUTHERN
OREGON, CRITICAL FIRE-WEATHER CONDITIONS ACROSS PORTIONS OF SOUTHERN
AND CENTRAL NEVADA, AND FOR PUSHING ENOUGH MONSOONAL MOISTURE INTO
PORTIONS OF ARIZONA, UTAH, AND SOUTHEASTERN IDAHO TO SUPPORT
LIGHTNING OVER DRY FUELS.
..CENTRAL/SOUTHERN NEVADA
DEEP BOUNDARY LAYER MIXING BELOW STRONG MERIDIONAL MID-LEVEL FLOW
WILL RESULT IN DRY AND WINDY CONDITIONS THAT OVERLAP WITH FUELS
RECEPTIVE TO WILDFIRE SPREAD (ERCS AT OR EXCEEDING THE 90TH ANNUAL
PERCENTILE). RELATIVE HUMIDITY OF 5-10% COUPLED WITH 25 MPH WINDS,
POSSIBLY GUSTING TO 30 MPH, ARE ANTICIPATED ACROSS PORTIONS OF
CENTRAL AND SOUTHERN NEVADA -- WARRANTING THE INTRODUCTION OF
CRITICAL HIGHLIGHTS.
..DRY THUNDERSTORMS
A MIX OF WET/DRY THUNDERSTORMS ARE ANTICIPATED ACROSS PORTIONS OF
NORTHERN CALIFORNIA INTO SOUTHERN AND EASTERN OREGON. THUNDERSTORMS
ARE EXPECTED TO DEVELOP WITHIN DEEP INVERTED-V BOUNDARY-LAYER
PROFILES WITH TOTAL PRECIPITABLE WATER CONTENT BETWEEN 0.5 - 0.75
IN, AND 0 - 6 KM MEAN WIND SPEEDS OF 15-20 MPH. WITH ERC PERCENTILES
CLIMBING TO THE 70TH-80TH ANNUAL PERCENTILES, LIGHTNING OVER DRY
FUELS WITH LITTLE WETTING PRECIPITATION WILL POSE A FIRE-WEATHER
RISK.
FURTHER EAST ACROSS PORTIONS OF NORTHERN ARIZONA, WESTERN/CENTRAL
UTAH, AND FAR SOUTHEASTERN IDAHO, A MIX OF WET AND DRY THUNDERSTORMS
IS EXPECTED. ERC FUEL PERCENTILES ARE MORE SIGNIFICANT ACROSS THIS
REGION, RANGING FROM THE 90TH ANNUAL PERCENTILES TO EXCEEDING THE
98TH ANNUAL PERCENTILES ACROSS LARGE PORTIONS OF THE REGION. WITH
TOTAL PRECIPITABLE WATER VAPOR CONTENT FORECAST BETWEEN 0.5 AND 0.8
INCHES RESULTING IN LOWER PRECIPITATION EFFICIENCY, DRY LIGHTNING
IGNITIONS WILL BE POSSIBLE.
..HALBERT.. 07/01/2025
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
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