National Weather Service Raw Text Product

000 
FNUS21 KWNS 260820
STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK
400 AM CDT SAT AUG 26 2000
  
DAY 1 FIRE WEATHER OUTLOOK...REF AWIPS GRAPHIC PMWE98 KWNS
 
VALID 261200-271200
  
...EXTREMELY CRITICAL FIRE WEATHER AREA 1 - (ID / MT / NWRN WY)...
   
PRIMARY CONDITIONS: STRONG SW-W WINDS / LOW RH VALUES / FRONTAL
BOUNDARY / WARM-HOT SURFACE TEMPERATURES  

AS A POTENT MID-UPPER LEVEL TROUGH SWINGS THROUGH SRN CANADA A COLD
FRONT WILL PROGRESS THROUGH THIS REGION AND WILL STRETCH FROM NRN
MT SWWD INTO...SCNTRL ID AND INTO SERN OR BY 27/00Z. AHEAD OF THIS
BOUNDARY WINDS WILL INCREASE THROUGHOUT THE AFTERNOON TO BETWEEN
15-25 MPH WITH HIGHER GUSTS LIKELY. BEHIND THE BOUNDARY WINDS WILL
SHIFT TO THE WEST BETWEEN 15-30 MPH WITH GUSTS AS HIGH AS 40-50 MPH
POSSIBLE...ESPECIALLY IN HIGHLY EXPOSED AREAS SUCH AS RIDGE TOPS
AND WESTWARD FACING SLOPES. ALTHOUGH RH VALUES WILL INCREASE SOME
BEHIND THE BOUNDARY BY LATE EVENING...READINGS AHEAD OF THE FRONT
WILL RANGE BETWEEN 5-20 PERCENT. SURFACE TEMPERATURES WILL SOAR
AHEAD OF THE DRY COLD FRONT TO BETWEEN 85-95 DEGREES ESPECIALLY IN
CNTRL AND ECNTRL MT BY AFTERNOON. ANY FIRES THAT EITHER IGNITE OR
ARE ALREADY BURNING AMIDST THESE CHANGING FIRE FIGHTING CONDITIONS. 
  
...CRITICAL FIRE WEATHER AREA 2 - (ERN ID / NWRN WY / SRN MT)...

PRIMARY CONDITIONS: DRY THUNDERSTORMS / FRONTAL BOUNDARY / STRONG
LAPSE RATES / DRY LOWER LEVELS / WARM-HOT SURFACE TEMPERATURES

AS THE DRY COLD FRONTAL BOUNDARY APPROACHES THESE REGIONS BY LATER
AFTERNOON...THERE IS THE POSSIBILITY OF SCATTERED DRY THUNDERSTORMS
ON THE EDGE OF THE DEEPER MONSOONAL MOISTURE FLOW. MID-LEVEL LAPSE
RATES ON THE ORDER OF 8.5-9.0 C/KM WILL COMBINE WITH DRY LOW LEVELS
AND VERY STRONG SURFACE HEATING TO YIELD A VERY UNSTABLE ATMOSPHERE
BY MID-AFTERNOON. WITH MID-LEVEL RH VALUES APPROACHING 50-65
PERCENT AND LOWER LEVEL RH VALUES BETWEEN 15-25 PERCENT...THE
ATMOSPHERE APPEARS PRIMED FOR SCATTERED AREAS OF DRY THUNDERSTORMS
THAT COULD YIELD ADDITIONAL FIRE STARTS.
  
...SYNOPSIS... 

FOR THE DAY ONE PERIOD...PROGRESSION IN THE MID-UPPER LEVEL PATTERN
WILL OCCUR ACROSS WRN INTO CNTRL CANADA AS A STRONG CLOSED UPPER
LOW IS FORECAST TO BUILD INTO NRN ALBERTA BY 27/12Z. THE INITIAL
SURGE FROM THIS STRONG MID-UPPER LEVEL TROUGH SHOULD AFFECT AREAS
OF THE PAC NW AND NRN ROCKIES TODAY AS MID-UPPER LEVEL ENERGY
SWINGS EWD ALONG THE CANADIAN BORDER FROM NWRN WA THIS MRNG TO NRN
MT BY 27/00Z. ELSEWHERE...THE SWRN/SRN PLAINS RIDGE AND AN ERN U.S.
TROUGH WILL REMAIN INTACT TODAY...ALTHOUGH THERE WILL BE SOME
FLATTENING TO THE RIDGE ACROSS THE WRN STATES DUE TO THE
ADVANCEMENT OF THE STRONG MID-UPPER LEVEL TROUGH EWD THROUGH
CANADA. 

FIRE WX CONCERNS AGAIN WILL BE IN THE WEST AS MOST OF THE WESTERN
THIRD OF THE COUNTRY REMAINS UNDER SEVERE TO EXTREME DROUGHT
CONDITIONS. THE FOCUS OF THIS FORECAST WILL BE ON THE INCREASING
WINDS ACROSS THE NRN ROCKIES REGION TODAY AND THE POSSIBILITY OF
AREAS OF DRY THUNDER. A COLD FRONT WILL MOVE EWD THROUGH THE
INTERMOUNTAIN STATES AS THE MID-UPPER LEVEL TROUGH SURGES EWD IN
SRN CANADA. ALTHOUGH WINDY CONDITIONS SHOULD BE PREVALENT
THROUGHOUT THE REGION...AN AXIS FROM ERN WA...EWD THROUGH NRN
ID...INTO NCNTRL MT WILL BE THE RECIPIENT OF THE STRONGEST WINDS.
THE COLD FRONT WILL MOVE THROUGH THE REGION RATHER QUICKLY TODAY
FROM ERN MT/NCNTRL ID THIS MRNG TO WRN ND/NRN WY BY 27/12Z WITH NO
PRECIPITATION ANTICIPATED. FURTHER SOUTH...MONSOONAL MOISTURE WILL
CONTINUE TO ADVANCE NWD FROM THE FOUR CORNERS REGION AFFECTING
AREAS OF THE CNTRL AND NRN ROCKIES YIELDING SCATTERED AREAS OF
CONVECTION. FORECAST SOUNDINGS AND MODEL DATA SUGGEST THE GREATEST
THREAT OF DRY THUNDER WILL AGAIN BE ON PERIPHERY OF THE MONSOONAL
MOISTURE SHIELD FROM ERN ID ENEWD THROUGH WRN/NWRN WY INTO SRN MT.
STRONG MID-LEVEL LAPSE RATES WILL COMBINE WITH DRIER LOWER LEVELS
AND AN APPROACHING COLD FRONT TO YIELD SCATTERED AREAS OF DRY
THUNDERSTORMS. 
  
..NADEN.. 08/26/00
   
DAY1/DAY2 FIRE WEATHER TEXT/GRAPHICS OUTLOOKS ARE AVAILABLE AT
 WWW.SPC.NOAA.GOV/FIRE
  
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