FNUS76 KSEW 011518
FWSSEW

SPOT FORECAST FOR WEIR PRAIRIE...FT LEWIS FORESTRY
NATIONAL WEATHER SERVICE SEATTLE WA
818 AM PDT TUE SEP 1 2009

FORECAST IS BASED ON IGNITION TIME OF 1200 PDT ON SEPTEMBER 01.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...AN UPPER LEVEL TROUGH OVER THE EASTERN PACIFIC HAS
BROUGHT A RETURN OF SOUTHERLY FLOW ALOFT. THE SOUTHERLY FLOW HAS
BROUGHT UP MOIST AND UNSTABLE AIR ABOVE THE MARINE LAYER. THIS
COULD RESULT IN A BRIEF RAIN SHOWER UP THROUGH IGNITION TIME...
BUT THEN THE SHOWER THREAT SHOULD END EARLY THIS AFTERNOON. MARINE
CLOUDS SHOULD BURN OFF THIS AFTERNOON...BUT THE MARINE INFLUENCE
WILL CONTRIBUTE TO A SOMEWHAT HUMID AND STABLE LOW-LEVEL AIR MASS.

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

.TODAY...

SKY/WEATHER.........MOSTLY CLOUDY AT IGNITION TIME WITH AN ISOLATED
                    SHOWER POSSIBLE. SHOWER THREAT ENDING DURING
                    THE EARLY AFTERNOON. SKIES TURNING MOSTLY SUNNY
                    AFTER 1500 PDT.
CWR.................5%.
MAX TEMPERATURE.....AROUND 71.
MIN HUMIDITY........51 PERCENT.
WIND (20 FT)........SOUTHWEST-WEST WINDS 3 TO 5 MPH.
MIXING HEIGHT.......1800 FT AGL AT IGNITION TIME...RISING TO
                    3500 FT AGL THIS AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 6 MPH AT IGNITION TIME...BECOMING
                    WEST 8 MPH THIS AFTERNOON.
HAINES INDEX........MID-LEVEL....3 OR VERY LOW.
                    HIGH-LEVEL...2 OR VERY LOW.

.TONIGHT...

WIND (20 FT)........NORTHWEST WINDS 3 TO 6 MPH EARLY THIS EVENING
                    BECOMING NEARLY CALM AFTER SUNSET.
MIXING HEIGHT.......3500 FT AGL DECREASING TO 1400 FT AGL LATE IN
                    THE EVENING.
TRANSPORT WINDS.....WEST AROUND 6 MPH EARLY THIS EVENING...
                    BECOMING SOUTHWEST 3 MPH AFTER SUNSET.

$$
FORECASTER...HANER
REQUESTED BY...DAN LEEPER
TYPE OF REQUEST...PRESCRIBED
.TAG 20090901.WEIRP.01/SEW