FNUS76 KSEW 011753
FWSSEW

SPOT FORECAST FOR GRAND PARK...NPS MT RAINER
NATIONAL WEATHER SERVICE SEATTLE WA
1053 AM PDT SAT AUG 1 2009

FORECAST IS BASED ON REQUEST TIME OF 1017 PDT ON AUGUST 01.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

...RED FLAG WARNING TODAY AND THIS EVENING FOR VERY DRY AND
UNSTABLE CONDITIONS...

.DISCUSSION...AN UPPER LEVEL RIDGE WILL EXPAND AND STRENGTHEN BACK
INTO THE PACIFIC NORTHWEST TODAY AS A WEAK TROUGH OF LOW PRESSURE
BRUSHES BY TO THE NORTH. THIS WILL BRING AN EXTREMELY DRY LAYER OF
MID-LEVEL AIR ACROSS THE GRAND PARK FIRE. THIS DRY LAYER OF AIR
SHOULD EASILY MIX IN AT THE ELEVATION OF THE FIRE THIS AFTERNOON
AND EVENING...CAUSING A PLUNGE IN HUMIDITY LEVELS LASTING SEVERAL
HOURS. THE DRY LAYER OF AIR SHOULD EXIT OVERNIGHT BUT NOT BEFORE
CAUSING EXTREMELY POOR HUMIDITY RECOVERY TONIGHT. OTHERWISE...
PREVAILING NORTHWESTERLY FREE-AIR WINDS WILL SUPERIMPOSE SOMEWHAT
ON THE DIURNAL TERRAIN-DRIVEN WIND TODAY AND TOMORROW.

 FORECAST FOR 20 FOOT WIND SPEED (VALLEYS AND RIDGE TOPS) ARE 10
 MINUTE AVERAGES REFLECTING RAWS WINDS.

.TODAY...

SKY/WEATHER.........SUNNY.
CWR (>0.25")........0%.
MAX TEMPERATURE.....AROUND 81.
MIN HUMIDITY........19 PERCENT.
EYE LEVEL WINDS.....NORTHWEST WIND 3 TO 6 MPH.
WIND (20 FT)........NORTH-NORTHWEST WIND 7 TO 11 MPH.
MIXING HEIGHT.......2500-3500 FT AGL.
TRANSPORT WINDS.....WEST AROUND 7 MPH.
HAINES INDEX........MID-LEVEL....5 OR MODERATE.
                    HIGH-LEVEL...5 OR MODERATE.
LAL.................1.
RAINFALL AMOUNT.....0.00 INCHES.

.TONIGHT...

SKY/WEATHER.........CLEAR.
CWR (>0.25")........0%.
MIN TEMPERATURE.....AROUND 63.
MAX HUMIDITY........38 PERCENT.
EYE LEVEL WINDS.....WEST-NORTHWEST WINDS 2 TO 4 MPH.
WIND (20 FT)........WEST-NORTHWEST WINDS 6 TO 10 MPH.
MIXING HEIGHT.......3500 FT AGL DECREASING TO 1200 FT AGL LATE THIS
                    EVENING.
TRANSPORT WINDS.....NORTHWEST AROUND 12 MPH.
HAINES INDEX........MID-LEVEL....5 OR MODERATE.
                    HIGH-LEVEL...5 OR MODERATE.
LAL.................1.
RAINFALL AMOUNT.....0.00 INCHES.

.SUNDAY...

SKY/WEATHER.........MOSTLY SUNNY.
CWR (>0.25")........0%.
MAX TEMPERATURE.....AROUND 79.
MIN HUMIDITY........32 PERCENT.
EYE LEVEL WINDS.....NORTHWEST WIND 3 TO 6 MPH.
WIND (20 FT)........NORTH-NORTHWEST WIND 7 TO 11 MPH.
MIXING HEIGHT.......1200 FT AGL INCREASING TO 3300 FT AGL LATE IN
                    THE MORNING.
TRANSPORT WINDS.....NORTHWEST AROUND 9 MPH.
HAINES INDEX........MID-LEVEL....5 OR MODERATE.
                    HIGH-LEVEL...5 OR MODERATE.
LAL.................1.
RAINFALL AMOUNT.....0.00 INCHES.

$$
FORECASTER...HANER
REQUESTED BY...GAVIN WILSON
TYPE OF REQUEST...WILDFIRE
.TAG 20090801.GRAND.01/SEW