861  
FNUS21 KWNS 240648  
FWDDY1  
 
DAY 1 FIRE WEATHER OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK  
0148 AM CDT TUE SEP 24 2019  
 
VALID 241200Z - 251200Z  
   
..SYNOPSIS
 
 
AN UPPER LOW OVER THE SOUTHWEST WILL DEVELOP SOUTHWARD OVER  
NORTHWESTERN MEXICO TODAY. SURFACE HIGH PRESSURE WILL REMAIN OVER  
THE NORTHERN GREAT BASIN, WHILE FARTHER EAST A COLD FRONT WILL MOVE  
EASTWARD ACROSS THE NORTHERN/CENTRAL PLAINS.  
   
..PORTIONS OF NORTHERN CALIFORNIA
 
 
ELEVATED TO LOCALLY CRITICAL FIRE WEATHER CONDITIONS WILL LIKELY BE  
ONGOING AT THE START OF THE PERIOD ACROSS THE HIGHER ELEVATIONS OF  
THE NORTH/EAST BAY HILLS, DIABLO RANGE, NORTHERN COAST MOUNTAINS,  
AND WESTERN SLOPES OF THE NORTHERN SIERRAS AND ADJACENT FOOTHILLS AS  
OVERNIGHT RH RECOVERY REMAINS POOR IN CONJUNCTION WITH GUSTY SURFACE  
WINDS. LATER THIS AFTERNOON, ELEVATED FIRE WEATHER CONDITIONS SHOULD  
SPREAD TO THE LOWER ELEVATIONS OF THE SACRAMENTO VALLEY AS SUSTAINED  
NORTHERLY SURFACE WINDS OF 15-20 MPH DEVELOP IN COMBINATION WITH  
REDUCED RH VALUES OF 10-20%. LOCALLY ELEVATED FIRE WEATHER  
CONDITIONS WILL BE POSSIBLE AGAIN LATE TONIGHT INTO EARLY WEDNESDAY  
MORNING AT HIGHER ELEVATIONS AS RH RECOVERIES REMAIN POOR AMIDST  
OCCASIONALLY BREEZY WINDS.  
   
..PORTIONS OF SOUTHERN CALIFORNIA
 
 
ELEVATED CONDITIONS WILL LIKELY DEVELOP THIS MORNING ACROSS THE  
MOUNTAINS OF VENTURA, LOS ANGELES, AND SANTA BARBARA COUNTIES AS A  
FAVORABLE SURFACE PRESSURE GRADIENT SUPPORTS STRONG/GUSTY OFFSHORE  
SURFACE WINDS IN AREAS WITH LOWERED RH VALUES. WINDS ARE FORECAST TO  
GRADUALLY WEAKEN LATER THIS MORNING AND INTO THE AFTERNOON AS  
UPPER-LEVEL SUPPORT ASSOCIATED WITH THE PREVIOUSLY MENTIONED UPPER  
LOW SHIFTS AWAY FROM THIS AREA. STILL, ELEVATED CONDITIONS MAY  
PERSIST AS RH VALUES CONTINUE TO DECREASE AS DIURNAL HEATING OCCURS.  
SOME POTENTIAL FOR ELEVATED CONDITIONS COULD CONTINUE TONIGHT INTO  
EARLY WEDNESDAY MORNING, MAINLY IN THE HIGHER TERRAIN, AS RH VALUES  
REMAIN LOWERED IN THE PRESENCE OF LOCALLY STRONG/GUSTY OFFSHORE  
WINDS.  
   
..PORTIONS OF THE CENTRAL HIGH PLAINS
 
 
DOWNSLOPE, POST-FRONTAL LOW-LEVEL FLOW WILL OCCUR ACROSS PARTS OF  
THE CENTRAL HIGH PLAINS THIS AFTERNOON. ALTHOUGH STRONGER MID-LEVEL  
WINDS SHOULD GENERALLY REMAIN ACROSS THE NORTHERN ROCKIES/PLAINS,  
SOME ENHANCEMENT TO THE LOW-LEVEL FLOW SHOULD OCCUR ALONG AND EAST  
OF THE LARAMIE RANGE IN SOUTHEASTERN WY AND ADJACENT FAR NORTHERN  
CO. SUSTAINED WEST-NORTHWESTERLY WINDS OF 15-25 MPH APPEAR LIKELY.  
THESE STRONG/GUSTY SURFACE WINDS WILL LIKELY COMBINE WITH LOWERED RH  
VALUES OF 15-20% THIS AFTERNOON AS THE BOUNDARY LAYER BECOMES WELL  
MIXED. LATEST FUEL GUIDANCE SUGGESTS FINE FUELS REMAIN RECEPTIVE, SO  
A SMALL ELEVATED AREA HAS BEEN INCLUDED ACROSS THIS REGION.  
 
..GLEASON.. 09/24/2019  
   
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
 
 

 
 
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