FNUS75 KRIW 111634 FWSRIW SPOT FORECAST FOR WEST SLOPE RX...IA CDC NATIONAL WEATHER SERVICE RIVERTON WY 1034 AM MDT MON APR 11 2011 FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON APRIL 11. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... GUSTY WIND WILL DEVELOP TODAY AS A TIGHT PRESSURE GRADIENT REMAINS IN THE WAKE OF OUR RECENT TROUGH PASSAGE. A RIDGE OF HIGH PRESSURE WILL BUILD IN KEEPING PRECIPITATION AWAY DURING THE DAYLIGHT HOURS TODAY. SOME LIGHT SHOWERS MAY DEVELOP OVERNIGHT AHEAD OF A COLD FRONT WHICH WILL MOVE THROUGH DURING THE EARLY MORNING HOURS TUESDAY. HIGHER RH AND LOWER MIXING HEIGHTS CAN BE EXPECTED TUESDAY IN THE WAKE OF THE FRONT AS COOLER TEMPERATURES TAKE HOLD OVER RESIDUAL MOISTURE FROM EARLY MORNING SNOW SHOWERS. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...BERC .TODAY... SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT) THEN BECOMING PARTLY CLOUDY (35-45 PERCENT). MAX TEMPERATURE.....52-55. MIN HUMIDITY........31-34 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 3-8 MPH BECOMING SOUTH 11 TO 12 MPH WITH GUSTS TO AROUND 25 MPH AFTER NOON. RIDGE TOP WINDS.....SOUTH 15 TO 20 MPH. MIXING HEIGHT.......1500 FT AGL INCREASING TO 4600 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTH 16 TO 21 MPH. SMOKE DISPERSAL.....POOR (21500 KNOT-FT) INCREASING TO GOOD (80200 KNOT-FT) AFTER NOON. .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING MOSTLY CLOUDY (65-75 PERCENT). SLIGHT CHANCE OF RAIN SHOWERS THROUGH THE NIGHT. SLIGHT CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. MIN TEMPERATURE.....33-36. MAX HUMIDITY........73-76 PERCENT. 20 FOOT WINDS.......SOUTHEAST WINDS 8 TO 10 MPH AND GUSTY IN THE EVENING BECOMING DOWNSLOPE/DOWNVALLEY 4-7 MPH. RIDGE TOP WINDS.....SOUTHEAST AROUND 15 MPH BECOMING SOUTH AROUND 5 MPH AFTER MIDNIGHT...THEN SHIFTING TO THE NORTH BY 6 AM. MIXING HEIGHT.......1100-2100 FT AGL. TRANSPORT WINDS.....SOUTH 9 TO 18 MPH SHIFTING TO THE NORTH EARLY IN THE MORNING. SMOKE DISPERSAL.....POOR (1300-35800 KNOT-FT). .TUESDAY... SKY/WEATHER.........CLOUDY (80-90 PERCENT). SLIGHT CHANCE OF SNOW SHOWERS IN THE MORNING. SLIGHT CHANCE OF RAIN SHOWERS THROUGH THE DAY. MAX TEMPERATURE.....46-49. MIN HUMIDITY........45-48 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH. RIDGE TOP WINDS.....NORTHWEST 5 TO 10 MPH SHIFTING TO THE SOUTHWEST EARLY IN THE AFTERNOON...THEN SHIFTING BACK TO THE NORTHWEST LATE IN THE AFTERNOON. MIXING HEIGHT.......1700 FT AGL INCREASING TO 4300 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....NORTHWEST 9 TO 13 MPH SHIFTING TO THE SOUTHWEST AROUND 10 MPH EARLY IN THE AFTERNOON...THEN SHIFTING BACK TO THE NORTHWEST LATE IN THE AFTERNOON. SMOKE DISPERSAL.....POOR (12500-30500 KNOT-FT). .FORECAST DAYS 3 THROUGH 5... .TUESDAY NIGHT...CLOUDY. CHANCE OF SHOWERS IN THE EVENING...THEN CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. LOWS IN THE LOWER 30S. WINDS GENERALLY LESS THAN 10 MPH. .WEDNESDAY...MOSTLY CLOUDY WITH CHANCE OF SHOWERS...SNOW SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE MID 30S. HIGHS IN THE LOWER 50S. WINDS GENERALLY LESS THAN 10 MPH. .THURSDAY...MOSTLY CLOUDY WITH CHANCE OF SHOWERS...SNOW SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE UPPER 20S. HIGHS IN THE MID 40S. WINDS GENERALLY LESS THAN 10 MPH. .FRIDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS IN THE LOWER 40S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...BERC REQUESTED BY...CDC REASON FOR REQUEST...PRESCRIBED .TAG 20110411.WESTS.01/RIW