Storm Prediction Center Day 1 Fire Weather Outlook

Created: Tue Nov 25 16:30:03 UTC 2014 (20141125 1700Z Day 1 FireWX shapefile | 20141125 1700Z Day 1 FireWX KML)

Day 1 Fire Weather Forecast graphic
Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
Critical 10,773 9,238,225 Riverside, CA...Chula Vista, CA...Glendale, CA...San Bernardino, CA...Irvine, CA...

Click for Day 1 FireWX Areal Outline Product

   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 251629

   DAY 1 FIRE WEATHER OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   1029 AM CST TUE NOV 25 2014

   VALID 251700Z - 261200Z

   ...CRITICAL FIRE WEATHER AREA FOR COASTAL RANGES AND FOOTHILLS OF
   SRN CA...

   NO CHANGES TO THE PREVIOUS FORECAST.

   ..PICCA.. 11/25/2014

   .PREV DISCUSSION... /ISSUED 0242 AM CST TUE NOV 25 2014/

   ...SYNOPSIS...
   UPPER LEVEL TROUGH INITIALLY OVER THE CNTRL CONUS WILL SHIFT EWD AND
   AMPLIFY AS A SHORTWAVE TROUGH MOVES THROUGH ITS BASE -- FROM THE
   SRN/CNTRL PLAINS INTO THE LWR/MID MS VALLEY. ANOTHER SHORTWAVE
   EMBEDDED WITHIN THE LARGER TROUGH WILL MOVE FROM THE NRN ROCKIES
   ACROSS THE NRN PLAINS AND INTO THE MID MO RIVER VALLEY. FARTHER
   W...UPPER RIDGE WILL CONTINUE TO BUILD ACROSS CA AND NV. PRIMARY
   FEATURES WITHIN THE SURFACE PATTERN WILL BE A LOW MOVING ACROSS THE
   NRN PLAINS...A COLD FRONT JUST OFF THE ERN SEABOARD...AND A RIDGE
   FROM THE GREAT BASIN SEWD INTO THE FOUR CORNERS. AFTER
   00Z/WED...SUBSTANTIAL DEEPENING OF A SURFACE LOW IS EXPECTED AS IT
   MOVES NEWD JUST OFF THE CAROLINA COAST.

   ...COASTAL RANGES AND FOOTHILLS OF SRN CA...
   07Z SURFACE OBSERVATIONS REVEAL A LAX-TPH GRADIENT AROUND 6 MB WITH
   SUSTAINED WINDS GENERALLY NEAR 15 MPH AND GUSTS AROUND 25 TO 30 MPH
   ACROSS SRN CA. OFFSHORE GRADIENT IS EXPECTED TO CONTINUE TO INCREASE
   THIS MORNING AS THE GREAT BASIN SURFACE RIDGE BUILDS WITH A
   RESULTANT INCREASE IN BOTH SUSTAINED SPEEDS AND GUST
   FREQUENCY/STRENGTH. POOR RH RECOVERY IS ONGOING /RH VALUES
   PREDOMINATELY BELOW 15 PERCENT AT 07Z/ AND RH VALUES ARE EXPECTED TO
   STAY BELOW 15 PERCENT THROUGHOUT THE DAY ACROSS THE COASTAL RANGES
   AND ADJACENT FOOTHILLS.

   WINDIEST CONDITIONS -- AND THEREFORE THE HIGHEST FIRE WEATHER THREAT
   -- ARE EXPECTED OVER SAN DIEGO COUNTY WHERE SUSTAINED WIND SPEEDS
   FROM 20 TO 30 MPH WITH GUSTS AROUND 40-50 MPH ARE ANTICIPATED.
   SLIGHTLY LOWER SPEEDS ARE EXPECTED FARTHER N. THE COMBINATION OF
   WINDY AND DRY CONDITIONS WILL RESULT IN CRITICAL FIRE WEATHER
   CONDITIONS...PRIMARILY FROM THE EARLY MORNING THROUGH MID-AFTERNOON.

   ...SRN HIGH PLAINS...
   SWLY SURFACE WINDS NEAR 20 MPH ARE ANTICIPATED OVER THE REGION AS
   LEE TROUGHING ACROSS THE HIGH PLAINS TIGHTENS THE SURFACE PRESSURE
   GRADIENT. DRY AIRMASS WILL HELP PUSH RH VALUES BELOW 20 PERCENT BUT
   GENERALLY COOL TEMPERATURES WILL KEEP ANY FIRE WEATHER THREAT LOW.

   ...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...

      

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