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 190809
   
   DAY 1 FIRE WEATHER OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0309 AM CDT SAT SEP 19 2009
   
   VALID 191200Z - 201200Z
   
   ...CRITICAL FIRE WEATHER AREA FOR WRN ND...NWRN SD...FAR ERN MT...
   
   ...SYNOPSIS...
   AN UPPER TROUGH WILL CONTINUE EWD ACROSS THE PACIFIC NW TODAY AND
   INTO THE NRN ROCKIES TONIGHT. AT THE SURFACE...A PACIFIC COLD FRONT
   WILL STRETCH FROM WRN MT INTO NRN CA BY 00Z. AHEAD OF THE FRONT...A
   WARM AND MAINLY DRY AIR MASS WILL RESIDE. ISOLATED TO SCATTERED DRY
   AND WET STORMS WILL ERUPT FROM UT INTO ERN ID AND SWRN MT...BECOMING
   MORE NUMEROUS ALONG THE COLD FRONT ACROSS SWRN MT THIS EVENING.
   AHEAD OF THE FRONT...A PRE-FRONTAL TROUGH WILL DEEPEN OVER CNTRL AND
   ERN MT INTO ERN WY. A STRONG PRESSURE GRADIENT WILL RESULT WITH
   GUSTY SELY WINDS AND VERY LOW RH FROM THE WRN DAKOTAS INTO ERN MT.
   GUSTY WLY WINDS WILL ALSO OCCUR OVER WRN NV AHEAD OF THE COLD FRONT
   AND ALONG THE SIERRA FRONT ALONG WITH LOW RH FOR PERHAPS A LOCALIZED
   FIRE THREAT. ELSEWHERE...A VERY DRY AIR MASS WILL REMAIN OVER INLAND
   SRN CA WITH ONSHORE FLOW AND GUSTY AFTERNOON WINDS ACROSS THE
   DESERTS. HIGH PRESSURE WILL SETTLE INTO THE NERN STATES IN THE WAKE
   OF AN UPPER TROUGH WITH COOLER AND DRIER CONDITIONS.
   
   ...CRITICAL FIRE WEATHER AREA - WRN ND...NWRN SD...FAR ERN MT...
   
   PRIMARY CONDITIONS: MODERATE WINDS AND LOW RH...WIND SHIFT WITH COLD
   FRONT LATE
   
   A SURFACE LOW PRESSURE TROUGH WILL DEEPEN OVER CNTRL MT THIS
   AFTERNOON AHEAD OF AN APPROACHING UPPER TROUGH. AT THE SAME
   TIME...HIGH PRESSURE WILL REMAIN OVER THE UPPER MS VALLEY INTO THE
   GREAT LAKES...CREATING A STRONG PRESSURE GRADIENT. GUSTY SELY WINDS
   OF 15-25 MPH WILL RESULT. RELATIVELY WARM TEMPERATURES INTO THE
   UPPER 80S AND LOWER 90S WILL RESULT IN MIN RH VALUES INTO THE 10-15
   PERCENT RANGE...THE LOWEST VALUES BEING OVER ERN MT. THE NET RESULT
   WILL BE A FEW HOURS OF CRITICAL FIRE WEATHER CONDITIONS.  IN
   ADDITION...A COLD FRONT WILL MOVE ACROSS ERN MT OVERNIGHT...WITH
   WINDS SHIFTING TO NWLY AT 15-25 MPH. WHILE THIS COULD POSE A PROBLEM
   WITH ANY ONGOING FIRES...RH LEVELS WILL BE ON THE RISE DUE TO COOLER
   TEMPERATURES.
   
   ...CNTRL MT...
   WARM AND DRY CONDITIONS WILL PREVAIL TODAY AHEAD OF A COLD FRONT
   THAT WILL BE OVER WRN MT AROUND 00Z. SUSTAINED SWLY WINDS NEAR 15
   MPH ARE LIKELY ALONG WITH HIGHER GUSTS...AND MIN RH OF 15-20
   PERCENT. THE COLD FRONT WILL MOVE ACROSS THE AREA DURING THE EVENING
   HOURS WITH AN ABRUPT WIND SHIFT AS WELL AS SCATTERED THUNDERSTORMS.
   WHILE SUSTAINED WINDS WILL BE BELOW CRITICAL THRESHOLDS THIS
   AFTERNOON...THE WIND SHIFT WITH THE COLD FRONT COULD RESULT IN
   ERRATIC FIRE BEHAVIOR WITH ANY ONGOING FIRES...AS COULD WIND GUSTS
   WITH STORMS. 
   
   ...WRN MT...SERN ID...NRN UT AND WRN WY...
   COOLING ALOFT WITH THE UPPER TROUGH AS WELL AS MID LEVEL MOISTURE
   WILL RESULT IN SCATTERED THUNDERSTORMS THIS AFTERNOON. STORMS WILL
   FORM OVER THE HIGH TERRAIN OF UT...SERN ID...WRN WY AND SWRN
   MT...AND ALSO ALONG THE COLD FRONT FROM CNTRL ID INTO SWRN MT LATER
   TODAY. PRECIPTABLE WATER VALUES OF 0.65-0.75 IN. AND SLOW STORM
   MOTIONS SUGGEST A MIXTURE OF DRY AND WET STORMS...WITH MOSTLY WET
   STORMS ALONG THE COLD FRONT LATE.
   
   ...WRN NV...
   WLY WINDS WILL INCREASE ACROSS THE SIERRA AND INTO THE WRN GREAT
   BASIN AS THE UPPER TROUGH APPROACHES.  A VERY DRY AIR MASS WILL BE
   IN PLACE WITH MIN RH NEAR 15 PERCENT. THE STRONGEST WINDS WILL BE
   ALONG THE SIERRA FRONT WITH GUSTS OVER 30 MPH...BUT SUSTAINED WINDS
   OF 15-20 MPH AWAY FROM THE MTNS. ALTHOUGH WINDS WILL BE STRONGER
   OVER THE E SLOPES OF THE SIERRA...RH WILL ONLY BE MARGINALY LOW.
   
   ..JEWELL.. 09/19/2009
   
   ...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 190950
   
   DAY 2 FIRE WEATHER OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0450 AM CDT SAT SEP 19 2009
   
   VALID 201200Z - 211200Z
   
   ...NO CRITICAL AREAS...
   
   ...SYNOPSIS...
   AN UPPER TROUGH WILL CONTINUE EWD ACROSS THE NRN ROCKIES AND WILL
   BEGIN TO TURN SEWD INTO THE CNTRL PLAINS BY MON MORNING. AT THE
   SURFACE...A COLD FRONT WILL STRETCH FROM THE WRN DAKOTAS INTO THE
   SRN GREAT BASIN AT 00Z. NUMEROUS SHOWERS AND STORMS ARE LIKELY FROM
   MT INTO WY AND CO...WITH COOLER AIR BUILDING IN BEHIND THE FRONT
   WITH AN AREA OF HIGH PRESSURE CENTERED OVER THE PACIFIC NW.
   WIDESPREAD WINDY CONDITIONS WILL PREVAIL FROM ID INTO MT...WY...AND
   THE DAKOTAS BUT TEMPERATURES WILL BE RELATIVELY COOL AND RH ONLY
   MARGINALLY LOW. MEANWHILE...VERY DRY CONDITIONS WILL CONTINUE S OF
   THE FRONT OVER MUCH OF CA...SRN NV...AND SRN UT WITH ONSHORE FLOW
   FOR SRN CA. 
   
   SURFACE WINDS WILL BECOME NLY OVER ORE INTO NRN CA WITH A SURFACE
   THERMAL TROUGH OVER THE CNTRL CA VALLEYS. THIS WILL USHER VERY DRY
   AIR INTO NRN CA. E WINDS WILL DEVELOP OVERNIGHT W OF THE ORE
   CASCADES SWD INTO THE SACRAMENTO VALLEY AS HIGH PRESSURE BUILDS S.
   
   ...NRN CA...
   AN UPPER RIDGE WILL BEGIN TO BUILD ALONG THE PACIFIC COAST ON SUNDAY
   AS THE UPPER TROUGH DIGS SEWD ACROSS THE NRN ROCKIES AND INTO THE
   PLAINS. AN AREA OF HIGH PRESSURE WILL BE CENTERED OVER THE PACIFIC
   NW...AND THIS WILL CREATE NLY WINDS ACROSS NRN CA. WIND SPEEDS
   SHOULD REMAIN RELATIVELY LIGHT AT AROUND 10-15 MPH...BUT RH WILL DIP
   WELL INTO THE TEENS DURING THE DAY.  OVERNIGHT...THE SURFACE THERMAL
   TROUGH WILL SHIFT W...ALLOWING ELY DOWNSLOPE WINDS TO DEVELOP INTO
   THE SACRAMENTO VALLEY. THESE WINDS WILL RESULT IN POOR RH RECOVERY.
   DRY AIR WILL ALSO SPILL INTO THE VALLEY FROM THE N. 
   
   ...SRN ID...MT...WY...WRN DAKOTAS...
   STRONG W TO NW WINDS WILL EXIST AS THE UPPER TROUGH PASSES.
   SUSTAINED SPEEDS OF 25-30 MPH WILL BE COMMON FROM SRN ID INTO SRN
   WY...AND ALSO ACROSS MUCH OF MT AND INTO THE WRN DAKOTAS. DUE TO
   COOLER TEMPERATURES...RH VALUES WILL REMAIN ABOVE CRITICAL LEVELS.
   HOWEVER...THE STRONG WINDS COULD ENHANCE FIRE POTENTIAL WITH ANY
   FIRE STARTS CAUSED BY LIGHTNING ON THE PREVIOUS DAY.
   
   ..JEWELL.. 09/19/2009
   
   ...PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
   
      

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