Storm Prediction Center
Day 1 and Day 2 Fire Weather Outlooks

Day 1 Fire Weather Forecast graphic

Click for Day 1 FireWX Areal Outline Product

   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 270938
   
   DAY 1 FIRE WEATHER OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0338 AM CST TUE NOV 27 2007
   
   VALID 271200Z - 281200Z
   
   ...NO CRITICAL AREAS...
   
   ...SYNOPSIS...
   A LARGE UPPER-LEVEL TROUGH WILL DIG INTO THE WESTERN UNITED
   STATES...WITH A LEE SURFACE TROUGH DEVELOPING AHEAD OF THIS SYSTEM
   IN THE HIGH PLAINS. AS THE SYSTEM MOVES INTO THE ROCKIES...A SURFACE
   HIGH PRESSURE AREA WILL BUILD IN THE NORTHERN GREAT BASIN AREA...AND
   BY THE END OF THE PERIOD...WINDS WILL BECOME NORTHEASTERLY IN THE
   COASTAL AREAS OF SOUTHWEST CALIFORNIA WITH AN OFF-SHORE COMPONENT
   DEVELOPING...BRINGING FIRE WEATHER CONDITIONS TO NEAR CRITICAL.
   NORTH OF THAT AREA...IN WESTERN CALIFORNIA...WIND SPEEDS WILL BECOME
   HIGH IN MOUNTAIN PASSES AND VALLEYS. ELSEWHERE IN THE COUNTRY...THE
   SOUTHEASTERN U.S. WILL REMAIN UNDER A HIGH PRESSURE SYSTEM WITH
   SEASONABLY DRY AIR IN PLACE.
   
   ...WESTERN CA...
   NORTHERLY WINDS WILL INCREASE DURING THE DAY ON TUESDAY IN RESPONSE
   TO A DEVELOPING HIGH PRESSURE SYSTEM OVER THE GREAT BASIN...WITH
   WIND SPEEDS IN MAINLY MOUNTAIN PASSES AND VALLEYS LIKELY APPROACHING
   25 TO 30 MPH WITH HIGHER GUSTS.  LACK OF A SIGNIFICANT OFF-SHORE
   COMPONENT WILL HELP KEEP RELATIVE HUMIDITY VALUES ABOVE CRITICAL
   LEVELS AT AROUND 30 TO 35 PERCENT.
   
   ...SOUTHWESTERN CA...
   A MODERATELY STRONG SURFACE PRESSURE GRADIENT WILL DEVELOP BETWEEN
   THE COASTAL AREAS OF SOUTHWESTERN CA AND THE GREAT BASIN BY THE END
   OF THE FORECAST PERIOD...AND SOME OFF-SHORE WINDS CAN BE EXPECTED BY
   LATE TUESDAY NIGHT.  WIND SPEEDS IN MOUNTAIN PASSES AND VALLEYS WILL
   LIKELY BE STRONG WITH 25 MPH SUSTAINED...TO 40 TO 50 MPH GUSTS.  A
   DRY AIR MASS REMAINS IN PLACE IN THE REGION...AND RELATIVE HUMIDITY
   VALUES WILL APPROACH CRITICAL VALUES...TO AROUND 15 PERCENT.
   
   ...SRN HIGH PLAINS...
   A LEE TROUGH WILL DEVELOP OVER THE GREAT PLAINS AHEAD OF A RAPIDLY
   MOVING UPPER-LEVEL THROUGH THAT WILL MOVE INTO THE CENTRAL ROCKIES. 
   SURFACE WIND SPEEDS WILL BE SUSTAINED AROUND 30 MPH...WITH HIGHER
   GUSTS...IN THE AFTERNOON DUE TO A STRONG SURFACE PRESSURE GRADIENT
   OVER THE AREA.  RELATIVE HUMIDITY VALUES WILL APPROACH CRITICAL
   LIMITS TO AROUND 25 TO 30 PERCENT...AND WITH COOL HIGH TEMPERATURES
   IN THE MID 50S F...A CRITICAL FIRE WEATHER RISK IS NOT EXPECTED.
   
   ...SERN STATES...
   A SURFACE HIGH PRESSURE SYSTEM REMAINS IN PLACE ACROSS THE AREA AND
   RELATIVE HUMIDITY VALUES COULD BRIEFLY DIP BELOW 30 PERCENT IN SOME
   AREAS DURING THE AFTERNOON HOURS.  LACK OF SIGNIFICANT SURFACE WIND
   SPEEDS...COUPLED WITH COOL TEMPERATURES AROUND 60 F...WILL HELP
   MITIGATE THE FIRE WEATHER RISK.
   
   ..LEVIT.. 11/27/2007
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
   
      
Day 2 Fire Weather Forecast graphic

Click for Day 2 FireWX Areal Outline Product

   ZCZC SPCFWDDY2 ALL
   FNUS22 KWNS 270952
   
   DAY 2 FIRE WEATHER OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0352 AM CST TUE NOV 27 2007
   
   VALID 281200Z - 291200Z
   
   ...CRITICAL FIRE WEATHER AREA FOR COASTAL AREAS OF SOUTHWEST CA...
   
   ...SYNOPSIS...
   A FAIRLY WEAK TO LOW-END MODERATE SANTA ANA WIND EVENT WILL OCCUR
   DURING THE DAY ON WEDNESDAY OVER THE COASTAL AREAS OF SOUTHWESTERN
   CA...WHILE A COLD FRONT MOVES THROUGH THE CENTRAL PART OF THE UNITED
   STATES. THE PROGRESSIVE UPPER-AIR PATTERN CONTINUES...AND THE
   UPPER-LEVEL TROUGH OVER THE ROCKIES WILL MOVE TO THE EAST COAST AS
   ANOTHER TROUGH MOVES INTO THE PACIFIC NORTHWEST...BRINGING ANOTHER
   COLD FRONT TO THE REGION.  IN THE SOUTHEASTERN U.S...A DRY AIR MASS
   REMAINS IN PLACE...AND ANOTHER HIGH PRESSURE SYSTEM WILL BUILD INTO
   THE REGION BEHIND A COLD FRONT THAT WILL MOVE THROUGH EARLY THURSDAY
   MORNING.
   
   ...CRITICAL FIRE WEATHER AREA - COASTAL AREAS OF SOUTHWEST CA...
   
   PRIMARY CONDITIONS: LOW RELATIVE HUMIDITY VALUES...SANTA ANA WIND
   CONDITIONS...DROUGHT
   
   AT THE BEGINNING OF THE FORECAST PERIOD...A HIGH PRESSURE SYSTEM
   WILL BE IN PLACE OVER THE GREAT BASIN AND A SANTA ANA WIND EVENT
   WILL BE IN PROGRESS.  NORTHEASTERLY WIND SPEEDS IN MOUNTAIN PASSES
   AND VALLEYS ARE FORECAST TO BE AROUND 20 TO 30 MPH WITH GUSTS TO
   AROUND 50 MPH...AND A DRY AIRMASS REMAINS IN PLACE WITH RELATIVE
   HUMIDITY VALUES LIKELY TO REACH 10 TO 15 PERCENT IN THE AFTERNOON. 
   AS THE DAY CONTINUES...THE PRESSURE GRADIENT WILL RELAX SOMEWHAT AS
   THE HIGH PRESSURE SYSTEM MOVES TO THE CENTRAL ROCKIES...AND WIND
   SPEEDS SHOULD DECREASE BY LATE WEDNESDAY.  GIVEN THE DRY AIR
   MASS...GUSTY WINDS...AND CONTINUED DROUGHT IN THE REGION...A
   CRITICAL FIRE WEATHER RISK IS EXPECTED.
   
   ...WESTERN CA...
   NORTH TO NORTHEASTERLY WINDS WILL EXIST OVER THE AREA WITH RELATIVE
   HUMIDITY VALUES DROPPING TO AROUND 30 PERCENT IN THE AFTERNOON. WIND
   SPEEDS WILL BE FAIRLY STRONG EARLY WEDNESDAY AT THE PEAK OF
   STRONGEST PRESSURE GRADIENT BETWEEN THE GREAT BASIN HIGH PRESSURE
   AND THE REGION...WITH WINDS IN AREAS OF ENHANCED TERRAIN REACHING 15
   TO 25 MPH WITH GUSTS AROUND 40 MPH. WINDS ARE EXPECTED TO DECREASE
   BY LATE WEDNESDAY.
   
   ...SERN STATES...
   AS IN PREVIOUS DAYS...A DRY AND COOL AIR MASS REMAINS IN PLACE
   ACROSS THE REGION.  RELATIVE HUMIDITY VALUES WILL FALL BELOW 30
   PERCENT IN SOME AREAS DURING A SHORT PERIOD ON WEDNESDAY
   AFTERNOON...BUT LACK OF STRONG WINDS AND UNSEASONABLY HIGH
   TEMPERATURES WILL KEEP THE FIRE WEATHER RISK TO A MINIMUM.
   
   ..LEVIT.. 11/27/2007
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
   
      

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