Storm Prediction Center
Day 1 and Day 2 Fire Weather Outlooks
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FNUS21 KWNS 090842
STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK
343 AM CDT FRI AUG 09 2002
DAY 1 FIRE WEATHER OUTLOOK...REF AWIPS GRAPHIC PMWE98 KWNS
VALID 091200-101200
...CRITICAL FIRE WEATHER AREA FOR SWRN ORE AND FAR NRN CA...
...SYNOPSIS...
A STRONG 500MB RIDGE WILL REMAIN IN PLACE FROM THE CA COAST SEWD
INTO THE SRN PLAINS. A STRONG SHORTWAVE TROUGH OVER ERN MT EARLY
THIS MORNING WILL MOVE INTO THE WRN DAKOTAS BY THIS EVENING. A DRY
CONTINENTAL AIR MASS AND SURFACE HIGH PRESSURE OVER THE MID-
ATLANTIC STATES WILL BRING FAIR CONDITIONS TO MOST OF THE ERN
CONUS.
...CRITICAL FIRE WEATHER AREA 1 - SWRN ORE AND FAR NRN CA...
PRIMARY CONDITIONS: LOCALLY STRONG NLY WINDS / VERY LOW RH VALUES
/ DRY FUELS
HIGH TEMPERATURES IN THE 105-110F RANGE ACROSS THE NRN SACRAMENTO
VALLEY WILL INDUCE A STRONG THERMAL TROUGH AND N-S PRESSURE
GRADIENT ACROSS SRN ORE AND NRN CA. NLY TO NELY WINDS OF 15-25 MPH
ARE EXPECTED IN SOME AREAS ACROSS SWRN ORE AND FAR NRN
CA...PARTICULARLY WHEN THE GRADIENT IS STRONGEST DURING THE LATE
AFTERNOON AND EVENING PERIOD. SUNNY SKIES AND MID-LEVEL SUBSIDENCE
WILL BRING VERY LOW MINIMUM RH VALUES...RANGING FROM 10-15 PERCENT.
THESE VALUES WILL BE GENERALLY 5-10 PERCENT LOWER THAN THOSE
OBSERVED THURSDAY AFTERNOON. TEMPERATURES WILL BE SLIGHTLY WARMER
THAN YESTERDAY WITH HIGHS IN THE VALLEYS/BASINS IN THE LOW TO
MIDDLE 90S.
...CENTRAL AND SRN WY...
UPPER LOW PASSING NORTH AND NORTHEAST OF THE REGION TODAY IS
ASSOCIATED WITH MODERATE NWLY MID-LEVEL FLOW. VERTICAL MIXING WILL
ALLOW RH VALUES TO DROP BETWEEN 15-20 PERCENT FOR A FEW HOURS THIS
AFTERNOON WITH WLY TO NWLY SURFACE WINDS OF 15-25 MPH. CPC/NOAA
DROUGHT MONITOR INDICATES EXTREME TO EXCEPTIONAL DROUGHT CONDITIONS
OVER WY WITH NO RAINFALL ACROSS CENTRAL AND SWRN WY DURING THE PAST
7 DAYS.
...INTERIOR GA/SC/NC/AND THE FL PANHANDLE...
DRY CONTINENTAL AIR MASS AND CLEAR SKIES WILL CONTRIBUTE TO HIGH
TEMPERATURES RANGING FROM THE UPPER 80S TO MID 90S AND RH VALUES
AROUND 30 PERCENT IN A FEW LOCATIONS THIS AFTERNOON. LIGHT ELY TO
NELY WINDS /10 MPH OR LESS/ AROUND HIGH PRESSURE WILL MITIGATE FIRE
WEATHER CONCERNS.
..BANACOS.. 08/09/02
SPC FIRE WEATHER OUTLOOKS ARE AVAILABLE AT WWW.SPC.NOAA.GOV/FIRE
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FNUS22 KWNS 090841
STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK
341 AM CDT FRI AUG 09 2002
DAY 2 FIRE WEATHER OUTLOOK...REF AWIPS GRAPHIC PMWI98 KWNS
VALID 101200-111200
...NO LARGE-SCALE SIGNIFICANT FIRE WEATHER CONDITIONS EXPECTED...
...SYNOPSIS...
DURING THE DAY 2 PERIOD...AN UPPER RIDGE WILL REMAIN IN PLACE
ACROSS THE SRN TIER OF THE CONUS. MODERATELY STRONG WLY FLOW WILL
CONTINUE FROM THE PACIFIC NW EWD INTO THE WRN GREAT LAKES REGION.
WITHIN THE WESTERLIES...A STRONG SHORTWAVE TROUGH OVER WRN MN AT
10/12Z WILL TRACK NEWD INTO CENTRAL ONTARIO BY THE END OF THE
PERIOD. A SECOND UPPER TROUGH WILL MOVE SEWD OUT OF BRITISH
COLUMBIA AND SRN ALBERTA LATE IN THE PERIOD...AND MAY BE ASSOCIATED
WITH A MARINE PUSH SATURDAY EVENING EAST OF THE CASCADE RANGE IN WA
AND PERHAPS NRN ORE.
...ERN SLOPES OF CASCADES EWD ACROSS COLUMBIA BASIN IN WA/NRN
ORE...
WLY DOWNSLOPE WINDS OF 15-25 MPH ARE POSSIBLE EAST OF THE CASCADE
MTNS DURING THE LATE AFTERNOON THROUGH OVERNIGHT PERIOD. MINIMUM RH
VALUES IN THE VALLEYS WILL RANGE FROM 15-25 PERCENT...WITH
DOWNSLOPE DRYING RESULTING IN CONTINUED LOW RH THROUGH MOST OF THE
OVERNIGHT PERIOD. MARGINALLY DRY FUEL CONDITIONS AND MARGINAL WIND
SPEEDS EXPECTED BASED ON CURRENT NUMERICAL GUIDANCE WILL PRECLUDE
A CRITICAL FIRE WEATHER AREA AT THIS TIME. REGION WILL BE MONITORED
FOR A POSSIBLE UPGRADE IN TOMORROW/S DAY 1 OUTLOOK.
..BANACOS.. 08/09/02
SPC FIRE WEATHER OUTLOOKS ARE AVAILABLE AT WWW.SPC.NOAA.GOV/FIRE
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