FNUS75 KRIW 211615
FWSRIW

SPOT FORECAST FOR WEST SLOPE RX...IA CDC
NATIONAL WEATHER SERVICE RIVERTON WY
1015 AM MDT THU APR 21 2011

FORECAST IS BASED ON IGNITION TIME OF 1200 MDT ON APRIL 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A WAVE OF LOW PRESSURE IS EXPECTED TO MOVE OVER THE BURN SITE THIS
AFTERNOON. THIS SYSTEM WILL INTRODUCE RAIN SHOWERS WITH ISOLATED
THUNDERSTORMS FOR THE AFTERNOON. GUSTY WIND AND LIGHTNING WILL BE
THE PRIMARY THREATS OF ANY THUNDERSTORM ACTIVITY. THUNDERSTORM
PRESENCE WILL END WITH LOSS OF SUNLIGHT THIS EVENING. COOLER
TEMPERATURES WILL THEN MOVER OVER THE BURN SITE THIS
EVENING...CAUSING RAIN TO CONVERT TO SNOWFALL. THIS SNOWFALL WILL
CONTINUE THROUGH THE OVERNIGHT HOURS...AND INTO FRIDAY. SNOWFALL
AMOUNTS OF 2 TO 4 INCHES WILL BE POSSIBLE BY FRIDAY EVENING OVER
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.........MOSTLY CLOUDY (60-70 PERCENT). SCATTERED RAIN
                    SHOWERS AND ISOLATED THUNDERSTORMS AFTER 1300.
MAX TEMPERATURE.....54-58 BELOW 5000 FT...52-55 ABOVE 5000 FT.
MIN HUMIDITY........38-41 PERCENT BELOW 5000 FT...42-46 PERCENT
                    ABOVE 5000 FT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 2-7 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....SOUTHEAST 10 TO 15 MPH SHIFTING TO THE
                    SOUTHWEST 15 TO 20 MPH BY 1200.
LAL.................1 UNTIL 1300...THEN 2.
CHC OF WETTING RAIN.10 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO AROUND 6700 FT AGL BY 1400.
TRANSPORT WINDS.....SOUTHEAST 12 TO 13 MPH SHIFTING TO THE
                    SOUTHWEST 14 TO 18 MPH BY 1200.
SMOKE DISPERSAL.....FAIR TO GOOD (51500-94300 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........CLOUDY (90-100 PERCENT). RAIN SHOWERS LIKELY
                    WITH ISOLATED THUNDERSTORMS IN THE
                    EVENING. THUNDERSTORMS WILL EXIT THE AREA
                    AFTER 2100. RAIN WILL THEN CONVERT TO SNOWFALL
                    AFTER 2400 WITH NUMEROUS SNOW SHOWERS
                    EXPECTED OVERNIGHT.
MIN TEMPERATURE.....27-30 BELOW 5000 FT...25-28 ABOVE 5000 FT.
MAX HUMIDITY........90-95 PERCENT.
20 FOOT WINDS.......NORTHEAST WINDS 5-9 MPH WITH GUSTS TO
                    AROUND 15 MPH SHIFTING TO THE NORTHWEST WITH
                    GUSTS TO AROUND 15 MPH AFTER 1900. THEN
                    BECOMING DOWNSLOPE/DOWNVALLEY 4-7 MPH AFTER
                    0300. GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS IN THE EVENING.
RIDGE TOP WINDS.....NORTHEAST 10-15 MPH SHIFTING TO THE
                    NORTHWEST AFTER 1900...THEN SHIFTING
                    TO THE SOUTHWEST BY 0200.
LAL.................2 UNTIL 2100...THEN 1.
CHC OF WETTING RAIN.92 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......DECREASING TO AROUND 4600 FT AGL BY 0200.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.
SMOKE DISPERSAL.....GOOD (95200 KNOT-FT) DECREASING TO FAIR (44700
                    KNOT-FT) BY 0200.

.FRIDAY...
SKY/WEATHER.........CLOUDY (90-100 PERCENT). SNOW EXPECTED THROUGH
                    THE DAY.
MAX TEMPERATURE.....33-36 BELOW 5000 FT...31-35 ABOVE 5000 FT.
MIN HUMIDITY........44-47 PERCENT BELOW 5000 FT...45-50 PERCENT
                    ABOVE 5000 FT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING WEST 10 TO
                    12 MPH BY 1100. GUSTS TO AROUND 25 MPH
                    POSSIBLE AFTER 1300.
RIDGE TOP WINDS.....WEST 10 TO 15 MPH INCREASING TO 15 TO 20 MPH
                    AFTER 1400.
LAL.................1.
CHC OF WETTING RAIN.63 PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO AROUND 5700 FT AGL BY 1400.
TRANSPORT WINDS.....SOUTHWEST 12 TO 20 MPH INCREASING TO 20 TO 25
                    MPH AFTER 1400.
SMOKE DISPERSAL.....FAIR TO VERY GOOD (58300-102100 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...CLOUDY. CHANCE OF SNOW IN THE EVENING...THEN
SLIGHT CHANCE OF SNOW AFTER MIDNIGHT. LOWS IN THE LOWER 20S.
WINDS GENERALLY LESS THAN 10 MPH.
.SATURDAY...NOT AS COOL. PARTLY CLOUDY WITH SLIGHT CHANCE OF
SNOW. LOWS IN THE LOWER 30S. HIGHS IN THE MID 40S. WINDS
GENERALLY LESS THAN 10 MPH.
.SUNDAY...PARTLY CLOUDY. ISOLATED THUNDERSTORMS IN THE EVENING.
SLIGHT CHANCE OF SHOWERS. SLIGHT CHANCE OF SNOW SHOWERS AFTER
MIDNIGHT. LOWS IN THE MID 30S. HIGHS IN THE LOWER 50S. WINDS
GENERALLY LESS THAN 10 MPH.
.MONDAY...MOSTLY CLOUDY WITH CHANCE OF SHOWERS...SNOW SHOWERS AND
ISOLATED THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS AROUND 50.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...BRANHAM
REQUESTED BY...RXB2 MONONI
REASON FOR REQUEST...PRESCRIBED
.TAG 20110421.WESTS.01/RIW