Storm Prediction Center
Day 1 and Day 2 Fire Weather Outlooks

Day 1 Fire Weather Forecast graphic

   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 230951
   
   DAY 1 FIRE WEATHER OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0351 AM CST THU DEC 23 2004
   
   VALID 231200Z - 241200Z
   
   ...NO CRITICAL AREAS...
   
   ...SYNOPSIS...
   A BROAD/COLD UPPER TROUGH WILL RESIDE OVER THE COUNTRY TODAY. A
   STRONG EMBEDDED SHORTWAVE TROUGH WILL SHIFT SWD THROUGH THE ROCKIES
   ALONG THE WRN PERIPHERY OF THE BROAD TROUGH. WITH THE PASSAGE OF A
   LEAD TROUGH EARLY THIS MORNING AN INCREASING PRESSURE GRADIENT WILL
   SUPPORT ANOTHER OFFSHORE WIND EVENT OVER SRN CA...WITH MORE MODERATE
   WINDS ANTICIPATED OVER NRN CA AS UPPER RIDGING BEGINS TO BUILD INTO
   THIS REGION. THE PASSAGE OF A MID LEVEL SPEED MAX COUPLED WITH THE
   INTENSIFYING OFFSHORE PRESSURE GRADIENT WILL GENERATE SUSTAINED NELY
   WINDS OF 30-50 MPH WITH GUSTS OVER 70 MPH IN FAVORED TERRAIN
   LOCATIONS OF SRN CA LATER TODAY AND TONIGHT.  HOWEVER ANTECEDENT
   CONDITIONS WILL LIMIT A CRITICAL FIRE WEATHER THREAT.
   
   ...CA...
   OFFSHORE WINDS WILL CONTINUE TO STRENGTHEN OVER SRN CA SUPPORTED BY
   AN INCREASING PRESSURE GRADIENT BEHIND A LEAD SHORTWAVE TROUGH THAT
   MOVED ACROSS SRN CA EARLY THIS MORNING. ACROSS NRN CA...SUSTAINED
   NELY WINDS FROM 15-30 MPH WITH GUSTS OVER 40 MPH ARE ANTICIPATED
   OVER THE COASTAL RANGES AND WRN SLOPES OF THE SIERRA NV THIS
   MORNING...BUT THESE SHOULD DIMINISH DURING THE DAY AS THE PRESSURE
   GRADIENT WEAKENS. HOWEVER...A DRY AIRMASS WILL SUPPORT MIN RH
   READINGS FROM 15-20 PERCENT DURING THE AFTERNOON.
   
   AS A STRONG UPPER TROUGH MOVES SWD THROUGH THE ROCKIES...A MID LVL
   WIND MAX WILL DIVE INTO THE LOWER CO RIVER VALLEY/SRN CA LATER
   TODAY. STEEP LOW LEVEL LAPSE RATES AND THE PREEXISTING PRESSURE
   GRADIENT ALONG WITH THIS MID LVL WIND MAX WILL AID IN INCREASING
   OFFSHORE WINDS BY LATER TODAY/TONIGHT. SUSTAINED WINDS FROM 30-50
   MPH WILL OCCUR OVER MUCH OF SRN CA...WITH GUSTS OVER 70 MPH IN AND
   BELOW PASSES/CANYONS. DESPITE MODERATE COOLING OF TEMPERATURES
   ASSOCIATED WITH COLD ADVECTION IN THE LOWER LEVELS...STRONG
   SUBSIDENCE AND NELY TRAJECTORY OF CONTINENTAL AIRMASS WILL SUPPORT
   VERY LOW RH READINGS FROM 10-15 PERCENT AND POOR RH RECOVERY
   OVERNIGHT.
   
   ..CROSBIE.. 12/23/2004
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
   
      
Day 2 Fire Weather Forecast graphic

   ZCZC SPCFWDDY2 ALL
   FNUS22 KWNS 230955
   
   DAY 2 FIRE WEATHER OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0355 AM CST THU DEC 23 2004
   
   VALID 241200Z - 251200Z
   
   ...NO CRITICAL AREAS...
   
   ...SYNOPSIS...
   THE UPPER PATTERN ACROSS THE NATION WILL BEGIN A READJUSTMENT PHASE
   THROUGH THE PERIOD...AS DEEP UPPER TROUGH DIGS SWD OVER THE NRN
   PACIFIC AND UPPER TROUGH OVER THE CENTRAL PART OF THE COUNTRY BEGINS
   TO SLOWLY SHIFT EWD. IN BETWEEN...AN UPPER RIDGE WILL BUILD INTO THE
   WRN CONUS PROVIDING FOR DECREASING OFFSHORE WINDS ACROSS SRN CA
   ALONG WITH MILD TEMPERATURES.
   
   ...SRN CA...
   OFFSHORE WINDS WILL BE STRONG EARLY IN THE PERIOD /12-15Z/ BUT WILL
   DIMINISH THEREAFTER AS MID LVL SPEED MAX/SHORTWAVE TROUGH MOVE
   QUICKLY EWD ACROSS NRN MX. SUSTAINED NELY WINDS FROM 30-40 MPH WITH
   GUSTS OVER 60 MPH ARE ANTICIPATED EARLY...WITH WINDS DECREASING TO
   BETWEEN 20-30 MPH BY LATE AFTERNOON. RH READINGS WILL AGAIN BY VERY
   LOW 10-15 PERCENT AND POSSIBLY LOWER THAN DAY ONE...AS SFC
   TEMPERATURES ARE ANTICIPATED TO BE WARMER THAN DAY ONE. WINDS ARE
   NOT EXPECTED TO INCREASE OVERNIGHT DUE TO A WEAKENING SFC PRESSURE
   GRADIENT AS THE UPPER RIDGE BUILDS INTO THE REGION. THUS RH RECOVERY
   SHOULD BE AT LEAST FAIR.
   
   ..CROSBIE.. 12/23/2004
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
   
      

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