FNUS76 KSEW 061449
FWSSEW

SPOT FORECAST FOR BIG HUMP
NATIONAL WEATHER SERVICE SEATTLE WA
749 AM PDT TUE SEP 6 2011

IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER SERVICE.

...FIRE WEATHER WATCH IN EFFECT FOR WEDNESDAY AND THURSDAY FOR A DRY
AND UNSTABLE AIR MASS...

DISCUSSION...AN UPPER LEVEL RIDGE WILL STRENGTHEN OVER WESTERN
WASHINGTON AROUND THE MIDDLE OF THIS WEEK. THIS WILL PUSH A STRONG
SUBSIDENCE INVERION DOWN INTO THE LOWER ELEVATIONS...LEAVING THE MID
AND HIGH ELEVATIONS OF THE OLYMPICS EXPOSED TO AN EXTREMELY DRY AND
UNSTABLE AIR MASS ABOVE THE SUBSIDENCE INVERSION. LOWER ELEVATIONS
BELOW 2000 FEET MSL WILL BE CAPPED BY THE SUBSIDENCE INVERSION AND
WILL EXPERIENCE STABLE CONDITIONS.

FOR TUESDAY
   WEATHER............SUNNY.
   CWR................0%
   TEMPERATURE........MAX 76-82 DEPENDING ON ELEVATION
   HUMIDITY...........MIN 35% ALL ELEVATIONS
   20 FOOT WIND.......VALLEY/SLOPE...LIGHT WIND IN THE MORNING...
                       BECOMING UPSLOPE/UPVALLEY 4 TO 8 MPH AFTER
                       1100.
                      RIDGETOP...SOUTH-SOUTHWEST 5 MPH
   MIXING HEIGHT......RISING IN THE AFTERNOON TO 6500 FEET MSL
   MIXING WINDS.......DOWNVALLEY 3 MPH UNTIL 1100. AFTER 1100...
                      SOUTH TO SOUTHWEST 5 MPH ONCE SMOKE RISES ABOVE
                      THE RIDGETOPS.
   HAINES INDEX.......MID-LEVEL....5 OR MODERATE.
                      HIGH-LEVEL...5 OR MODERATE.
   LAL................1.
   RAINFALL AMOUNT....0.00

FOR TUSDAY NIGHT
   WEATHER............CLEAR
   CWR................0%
   TEMPERATURE........MIN 48-50 VALLEY BOTTOM. 54-57 ABOVE THE
                      NIGHTTIME INVERSION.
   HUMIDITY...........MAX XX%
   20 FOOT WIND.......VALLEY/SLOPE...DOWNSLOPE/DOWNVALLEY 2-4 MPH,
                       BECOMING LIGHT.
                      RIDGETOP...SOUTH WIND 3 TO 5 MPH
   MIXING HEIGHT......NEAR 0 FEET AGL. SMOKE SINKING INTO VALLEY.
   MIXING WINDS.......WESTERLY DOWNVALLEY 3 TO 5 MPH
   HAINES INDEX.......MID-LEVEL....5 OR MODERATE.
                      HIGH-LEVEL...5 OR MODERATE.
   LAL................1
   RAINFALL AMOUNT....0.00.

OUTLOOK FOR WEDNESDAY
   WEATHER............SUNNY.
   CWR................0%
   TEMPERATURE........MAX 82-87 DEPENDING ON ELEVATION.
   HUMIDITY...........MIN 30% ALL ELEVATIONS.
   20 FOOT WIND.......VALLEY/SLOPE....LIGHT WIND IN THE MORNING...
                       BECOMING UPSLOPE/UPVALLEY 4 TO 8 MPH AFTER
                       1100
   MIXING HEIGHT......RISING TO 6500 FEET MSL IN THE AFTERNOON.
   MIXING WINDS.......DOWNVALLEY 3 MPH UNTIL 1100. AFTER 1100...
                      SOUTH 5 MPH ONCE SMOKE RISES ABOVE THE
                      RIDGETOPS
   HAINES INDEX.......MID-LEVEL....5 OR MODERATE.
                      HIGH-LEVEL...5 OR MODERATE.
   LAL................1
   RAINFALL AMOUNT....0.00

OUTLOOK FOR THURSDAY THROUGH SATURDAY
SUNNY DAYS AND CLEAR NIGHTS WILL DOMINATE.
MAX TEMPS...80-85.
MIN RH...25-35 PERCENT EACH DAY.
WINDS WILL BE TERRAIN DRIVEN...UPSLOPE/UPVALLEY EACH AFTERNOON...
     DOWNSLOPE/DOWNVALLEY EACH NIGHT AND MORNING.
MID-LEVEL HAINES INDEX...6 ON THURSDAY...5 ON FRIDAY AND SATURDAY

FORECASTER...HANER

$$

REQUESTED BY...KATY DRESSLER
REASON FOR REQUEST...WILDFIRE