FNUS76 KSEW 131511
FWSSEW

SPOT FORECAST FOR JOHNSON PRAIRIE...FT LEWIS FORESTRY
NATIONAL WEATHER SERVICE SEATTLE WA
811 AM PDT THU AUG 13 2009

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON AUGUST 13.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE IN SEATTLE.

.DISCUSSION...AN UPPER LEVEL LOW PRESSURE SYSTEM WILL APPROACH
THE REGION FROM THE NW TODAY AND SETTLE OVERHEAD TONIGHT BEFORE
MOVING OFF TO THE EAST FRIDAY. THIS LOW COMBINED WITH DAYTIME
HEATING WILL GENERATE SCATTERED SHOWERS MID DAY ONWARD INTO
TONIGHT. THE AIR MASS IS UNSTABLE ENOUGH THAT THERE IS A CHANCE
OF A THUNDERSTORM FROM THE AFTERNOON INTO THE EVENING HOURS.

DRIER AND WARMER WEATHER IS EXPECTED TO BEGIN DEVELOPING THIS
WEEKEND WITH HOT AND DRY WEATHER EXPECTED FOR THE FIRST HALF OF
NEXT WEEK.

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

.TODAY...

SKY/WEATHER.........A FEW SUN BREAKS. ISOLATED SHOWERS THIS
                    MORNING...THEN A CHANCE OF SHOWERS AND ISOLATED
                    THUNDERSTORMS THIS AFTERNOON.
CWR.................22 PERCENT.
MAX TEMPERATURE.....AROUND 67.
TEMPERATURE AT 1100.AROUND 60.
MIN HUMIDITY........56 PERCENT.
HUMIDITY AT 1100....72 PERCENT.
EYE LEVEL WINDS.....SOUTHWEST WINDS 2 TO 4 MPH.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 7 MPH.
MIXING HEIGHT.......1600 FT AGL INCREASING TO 4900 FT AGL EARLY
                    THIS AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AROUND 5 MPH.
HAINES INDEX........3 OR VERY LOW.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...
MOSTLY CLOUDY. LOWS IN THE UPPER 40S. HIGHS IN THE MID 70S.
SOUTHWEST WINDS AROUND 7 MPH.
.SUNDAY...
PARTLY CLOUDY. LOWS AROUND 50. HIGHS IN THE UPPER 70S.
WEST WINDS AROUND 4 MPH.
.MONDAY...
PARTLY CLOUDY. LOWS IN THE LOWER 50S. HIGHS IN THE LOWER 80S.
NORTHEAST WINDS AROUND 6 MPH.

$$
FORECASTER...CERNIGLIA
REQUESTED BY...DAN LEEPER
TYPE OF REQUEST...PRESCRIBED
.TAG 20090813.JOHNS.01/SEW