FNUS76 KSEW 301514
FWSSEW

SPOT FORECAST FOR TA-14 PRAIRIE...FT LEWIS FORESTRY
NATIONAL WEATHER SERVICE SEATTLE WA
814 AM PDT FRI SEP 30 2011

FORECAST IS BASED ON IGNITION TIME OF 1300 PDT ON SEPTEMBER 30.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...AN UPPER RIDGE WILL BE BREAKING DOWN TODAY OVER THE
BURN AREA. THIS WILL ALLOW THE INVERSION AT THE TOP OF THE MIXED
LAYER TO LIFT IN ALTITUDE SOME TODAY AND BE A BIT WEAKER THAN
YESTERDAY. WITHIN THE MIXED LAYER UNTIL AROUND SUNSET...
NORTHERLY TRANSPORT WINDS WILL PREVAIL AND WILL BE THE MAIN
STEERING MECHANISM FOR LOW-LEVEL SMOKE. AT THE VERY TOP OF THE
MIXED LAYER...A SOUTH-SOUTHWEST WIND OF 5 TO 10 MPH WILL
PREVAIL. ANY SMOKE THAT GETS HOISTED HIGH ENOUGH WOULD GET PUSHED
BACK NORTH AS A SMOKE LAYER ALOFT...I.E. IT WOULD NOT AFFECT THE
GROUND.

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

.TODAY...

SKY/WEATHER.........PARTLY SUNNY. MAINLY MID LEVEL CLOUDS.
CWR (>0.25")........0%.
MAX TEMPERATURE.....AROUND 70.
MIN HUMIDITY........57 PERCENT.
WIND (20 FT)........NORTH-NORTHWEST WINDS 3 TO 5 MPH.
MIXING HEIGHT.......PEAKING NEAR 3400 FT AGL THIS AFTERNOON.
TRANSPORT WINDS.....NORTHWEST AROUND 3 MPH AT IGNITION TIME...
                    BECOMING NORTHEAST AROUND 5 MPH DURING THE
                    AFTERNOON.
HAINES INDEX........MID-LEVEL....4 OR LOW.
                    HIGH-LEVEL...2 OR VERY LOW.

.TONIGHT...

WIND (20 FT)........NORTH WINDS 4 TO 6 MPH EARLY THIS EVENING...
                    BECOMING LIGHT.
MIXING HEIGHT.......3400 FT AGL BEFORE SUNSET...DECREASING TO
                    500 FT AGL AFTER SUNSET...THEN NEAR 0 FT AGL
                    OVERNIGHT.
TRANSPORT WINDS.....NORTHEAST 5 TO 10 MPH THIS EVENING...
                    BECOMING LIGHT OVERNIGHT.

$$
FORECASTER...HANER
REQUESTED BY...BLAKE STANTON
TYPE OF REQUEST...PRESCRIBED
.TAG 20110930.TA14P.01/SEW