FNUS75 KRIW 201136
FWSRIW

SPOT FORECAST FOR WEST SLOPE BIG HORN SLASH PILE BURN...BLM WOD
NATIONAL WEATHER SERVICE RIVERTON WY
536 AM MDT SAT JUN 20 2009

FORECAST IS BASED ON IGNITION TIME OF 0900 MDT ON JUNE 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...HIGH PRESSURE WITH SOUTHERLY FLOW ALOFT WILL BE OVER THE
AREA THROUGH EARLY AFTERNOON.  THEN A LOW PRESSURE TROUGH OVER WESTERN
MONTANA...CENTRAL IDAHO AND NORTHEAST NEVADA THIS MORNING...WILL MOVE
WEST ACROSS NORTHERN WYOMING BRINGING CLOUDS RAIN SHOWERS AND THUNDERSTORMS
AFTER 3 PM MDT.  HAIL AND STRONG WIND GUSTS WITH LOCAL HEAVY RAIN WILL
BE A THREAT.  TEMPERATURES WILL COOL AND RELATIVE HUMIDITY WILL INCREASE
WITH LOWERING MIXING HEIGHTS WITH THE DEVELOPMENT OF SHOWERS AND
THUNDERSTORMS IN THE AREA.

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

FORECASTER...C.BAKER

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY UNTIL AROUND 2 PM THEN BECOMING
                    CLOUDY (85-100 PERCENT).  SCATTERED SHOWERS AND
                    THUNDERSTORMS AFTER 3 PM MDT IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........19-22 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTH AROUND
                    10 MPH LATE IN THE MORNING...THEN BECOMING
                    UPSLOPE/UPVALLEY 5-9 MPH IN THE AFTERNOON.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS.
RIDGE TOP WINDS.....SOUTH 10 TO 15 MPH.
LAL.................1 UNTIL 1200...THEN 4.
CHC OF WETTING RAIN.20 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......4900 FT AGL INCREASING TO 8400 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....SOUTH 12 TO 16 MPH.
SMOKE DISPERSAL.....FAIR EARLY THEN VERY GOOD BY NOON (10500 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). CHANCE OF
                    SHOWERS AND THUNDERSTORMS EARLY IN THE
                    EVENING...THEN SLIGHT CHANCE OF SHOWERS AND
                    THUNDERSTORMS IN THE LATE EVENING AND
                    OVERNIGHT.
MIN TEMPERATURE.....53-56.
MAX HUMIDITY........70-75 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4-7 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....SOUTHWEST AROUND 10 MPH.
LAL.................4 UNTIL 2100...THEN 3 UNTIL 2400...THEN 2.
CHC OF WETTING RAIN.20 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......5000 FT AGL DECREASING TO 1800 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST 9 TO 13 MPH.
SMOKE DISPERSAL.....BECOMING POOR BY 10 PM MDT (16500 KNOT-FT).

.SUNDAY...
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). SLIGHT CHANCE OF
                    RAIN SHOWERS THROUGH THE DAY. SLIGHT CHANCE OF
                    THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....74-77.
MIN HUMIDITY........20-23 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING WEST 10 TO 11
                    MPH WITH HIGHER GUSTS IN THE AFTERNOON. GUSTY
                    AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
                    IN THE AFTERNOON.
RIDGE TOP WINDS.....WEST 10 TO 15 MPH.
LAL.................1 UNTIL 1200...THEN 3.
CHC OF WETTING RAIN.10 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......5900 FT AGL INCREASING TO 8900 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST 9 TO 17 MPH.
SMOKE DISPERSAL.....FAIR (56300 KNOT-FT) INCREASING TO VERY GOOD
                    (129500 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SUNDAY NIGHT...MOSTLY CLOUDY. CHANCE OF SHOWERS AND
THUNDERSTORMS IN THE EVENING...THEN SLIGHT CHANCE OF SHOWERS
AFTER MIDNIGHT. LOWS IN THE LOWER 50S. WINDS GENERALLY LESS THAN
10 MPH.
.MONDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 50S. HIGHS IN THE MID 70S. WINDS
GENERALLY LESS THAN 10 MPH.
.TUESDAY...PARTLY CLOUDY WITH ISOLATED SHOWERS AND THUNDERSTORMS.
LOWS IN THE MID 50S. HIGHS IN THE MID 70S. WINDS GENERALLY LESS
THAN 10 MPH.
.WEDNESDAY...PARTLY CLOUDY WITH ISOLATED SHOWERS AND
THUNDERSTORMS. LOWS IN THE UPPER 50S. HIGHS IN THE UPPER 70S.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...C.BAKER
REQUESTED BY...ANDY ROTHLEUTNER
REASON FOR REQUEST...PRESCRIBED
.TAG 20090619.WESTS.03/RIW