FNUS75 KRIW 300458
FWSRIW

SPOT FORECAST FOR WEST SLOPE RX...USFS SHF
NATIONAL WEATHER SERVICE RIVERTON WY
1058 PM MDT THU MAR 29 2012

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON MARCH 30.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

DRY CONDITIONS EXPECTED AT THE BURN SITE TODAY. SOUTH TO SOUTHWEST
WIND IS EXPECTED TO INCREASE THIS AFTERNOON AS A MORE UNSTABLE
ENVIRONMENT MOVES INTO WYOMING. GUSTY WIND WILL CONTINUE INTO THE
EVENING...BEFORE TAPERING OFF UNDER THE INFLUENCE OF AN AREA OF
HIGH PRESSURE. AN APPROACHING WAVE OF LOW PRESSURE WILL CAUSE AN
INCREASE IN THE PRESSURE GRADIENT ON SATURDAY AFTERNOON...RESULTING
IN AN STRONG SOUTH TO SOUTHWEST WIND...ESPECIALLY IN THE
AFTERNOON WHEN GUSTS MAY APPROACH AROUND 40 MPH. THE LINGERING
HIGH PRESSURE WILL BRING LOWERED HUMIDITY ON SATURDAY AS
WELL...AND THE COMBINATION OF LOW HUMIDITY AND STRONG WIND MAY
INFLUENCE FIRE BEHAVIOR AT THE BURN SITE.

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

FORECASTER...BRANHAM

.TODAY...
SKY/WEATHER.........PARTLY CLOUDY (50-60 PERCENT).
MAX TEMPERATURE.....67-71.
MIN HUMIDITY........19-23 PERCENT.
20 FOOT WINDS.......SOUTH WINDS 10 TO 15. INCREASING TO 18 TO 22 MPH
                    AFTER 1300. GUSTS UP TO 35 MPH POSSIBLE.
RIDGE TOP WINDS.....SOUTH 15 TO 20 MPH...INCREASING TO 25 TO 30 MPH
                    BY 1400.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO AROUND 6700 FT AGL BY 1500.
TRANSPORT WINDS.....SOUTH 19 TO 24 MPH...BECOMING 25 TO 30 MPH
                    BY 1300.
SMOKE DISPERSAL.....VERY GOOD TO EXCELLENT (145000-200000 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (50-60 PERCENT) BY 0100.
MIN TEMPERATURE.....42-46.
MAX HUMIDITY........58-62 PERCENT.
20 FOOT WINDS.......SOUTH WINDS 9 TO 14 MPH. A LULL IN WIND IS
                    EXPECTED BETWEEN 2200 AND 0300 WHERE GUSTS
                    MAY ONLY BE AROUND 15 MPH. OTHERWISE...GUSTS
                    UP TO 25 MPH EXPECTED.
RIDGE TOP WINDS.....SOUTH 15 TO 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........INCREASING TO 3 OR VERY LOW POTENTIAL FOR LARGE
                    PLUME DOMINATED FIRE GROWTH AFTER 0100.
MIXING HEIGHT.......DECREASING TO 2300-3300 FT AGL AFTER 0200.
TRANSPORT WINDS.....SOUTH 17 TO 23 MPH.
SMOKE DISPERSAL.....FAIR TO VERY GOOD (53300-102300 KNOT-FT).

.SATURDAY...
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT).
MAX TEMPERATURE.....73-77.
MIN HUMIDITY........14-19 PERCENT.
20 FOOT WINDS.......SOUTH WINDS 15 TO 20 MPH. GUSTS UP TO 30 MPH
                    INCREASING TO AROUND 40 MPH AFTER 1200.
RIDGE TOP WINDS.....SOUTHEAST 20 TO 25 MPH SHIFTING TO THE SOUTH
                    AROUND 30 MPH AFTER 1200.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO 8500-9400 FT AGL
                    AFTER 1400.
TRANSPORT WINDS.....SOUTH 25 TO 30 MPH.
SMOKE DISPERSAL.....GOOD (91400 KNOT-FT) INCREASING TO EXCELLENT
                    (190700 KNOT-FT) AFTER 1400.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...PARTLY CLOUDY. ISOLATED SHOWERS AFTER MIDNIGHT.
LOWS IN THE LOWER 40S. SOUTH WINDS AROUND 14 MPH.
.SUNDAY...COOLER. MOSTLY CLOUDY. SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS IN THE UPPER 50S.
NORTHWEST WINDS AROUND 11 MPH.
.MONDAY...PARTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE MID
50S. WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...PARTLY CLOUDY. LOWS IN THE LOWER 40S. HIGHS IN THE MID
60S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...BRANHAM
REQUESTED BY...CDC
REASON FOR REQUEST...PRESCRIBED
.TAG 20120330.WESTS.01/RIW