FNUS75 KRIW 231445
FWSRIW

SPOT FORECAST FOR PORCUPINE...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
845 AM MDT SUN AUG 23 2009

FORECAST IS BASED ON REQUEST TIME OF 0812 MDT ON AUGUST 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
AN UPPER LEVEL PACIFIC STORM SYSTEM OVER THE NORTHERN GREAT BASIN
WILL CONTINUE TO PUMP MONSOON MOISTURE INTO WESTERN WYOMING TODAY.
ISOLATED LIGHT SHOWERS THIS MORNING WILL INCREASE TO SCATTERED
SHOWERS AND THUNDERSTORMS THIS AFTERNOON. THE ASSOCIATED COLD
FRONT WILL MOVE THROUGH THE FIRE AREA AROUND 1600 HOURS. SHOWERS
AND THUNDERSTORMS WILL GRADUALLY DECREASE BEHIND THE COLD FRONT.
WIDELY SCATTERED WETTING RAINS IS EXPECTED IN THE SALT RIVER RANGE
THIS AFTERNOON. GOOD TO EXCELLENT RELATIVE HUMIDITY LEVELS ARE
EXPECTED OVERNIGHT. ISOLATED SHOWERS AND THUNDERSTORMS ARE ANTICIPATED FOR
THROUGH THE DAY MONDAY AS ANOTHER WEAK PACIFIC TROUGH MOVES THROUGH THE
REGION.

...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS...
...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT...

FORECASTER...CHURCH

.TODAY...
SKY/WEATHER.........CLOUDY (75-85 PERCENT). ISOLATED LIGHT RAIN
                    SHOWERS AND ISOLATED THUNDERSTORMS IN THE
                    MORNING...THEN SCATTERED SHOWERS AND THUNDERSTORMS
                    IN THE AFTERNOON.
MAX TEMPERATURE.....63-67.
MIN HUMIDITY........36-39 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 3-7 MPH BECOMING SOUTHWEST
                    12 TO 16 MPH WITH GUSTS TO 21 MPH IN THE LATE MORNING.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....SOUTHWEST 12 TO 18 MPH INCREASING TO 20 TO 25 MPH IN
                    THE AFTERNOON.
LAL.................2 UNTIL 1200...THEN 5.
CHC OF WETTING RAIN.40 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE
                    GROWTH.
MIXING HEIGHT.......2800-3800 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 INCREASING TO 20 TO 25 MPH IN THE
                    AFTERNOON.
SMOKE DISPERSAL.....GOOD (48400-64300 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (50-60 PERCENT). SCATTERED
                    SHOWERS AND THUNDERSTORMS IN THE EVENING...THEN
                    ISOLATED SHOWERS AND THUNDERSTORMS AFTER
                    MIDNIGHT.
MIN TEMPERATURE.....44-47.
MAX HUMIDITY........87-92 PERCENT.
20 FOOT WINDS.......SOUTHWEST WINDS 8 TO 12 MPH WITH GUSTS TO 18 MPH EARLY
                    IN THE EVENING BECOMING WEST 4-8 MPH AROUND 1800 HRS.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....WEST 15 TO 20 MPH DECREASING TO AROUND 10 MPH
                    EARLY IN THE MORNING.
LAL.................4 UNTIL 2400...THEN 2.
CHC OF WETTING RAIN.25 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1400-2400 FT AGL.
TRANSPORT WINDS.....WEST 10 TO 15 MPH.
SMOKE DISPERSAL.....POOR (7000-34000 KNOT-FT).

.MONDAY...
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). ISOLATED
                    SHOWERS AND THUNDERSTORMS.
MAX TEMPERATURE.....61-64.
MIN HUMIDITY........40-44 PERCENT.
20 FOOT WINDS.......NORTHWEST 5-9 MPH IN THE MORNING...BECOMING
                    UPSLOPE 3 TO 5 MPH IN THE EARLY AFTERNOON...THEN
                    NORTHWEST 4 TO 7 MPH IN THE LATE AFTERNOON.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....WEST-NORTHWEST 10 TO 15 MPH.
LAL.................4.
CHC OF WETTING RAIN.10 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......2600 FT AGL INCREASING TO 4800 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST-NORTHWEST 10 TO 15 MPH.
SMOKE DISPERSAL.....GOOD (45400-60700 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.MONDAY NIGHT...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE LOWER 40S. WINDS GENERALLY LESS THAN
10 MPH.
.TUESDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 40S. HIGHS IN THE LOWER 60S. WINDS
GENERALLY LESS THAN 10 MPH.
.WEDNESDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 40S. HIGHS IN THE UPPER 60S. WINDS
GENERALLY LESS THAN 10 MPH.
.THURSDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 40S. HIGHS IN THE UPPER 60S. WINDS
GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...CHURCH
REQUESTED BY...BILL  MOE
REASON FOR REQUEST...WILDFIRE
.TAG 20090823.PORCU.01/RIW