FNUS75 KRIW 111530 FWSRIW SPOT FORECAST FOR LITTLE BROWN...USFS BTF NATIONAL WEATHER SERVICE RIVERTON WY 930 AM MDT FRI SEP 11 2009 FORECAST IS BASED ON INCIDENT TIME OF 0835 MDT ON SEPTEMBER 11. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...DRY...MOSTLY SUNNY AND MILD CONDITIONS CONTINUE TODAY WITH THE UPPER FLOW TURNING NORTHEAST. CLOUDS WILL BEGIN TO INVADE OVERNIGHT AS A STORM SYSTEM MOVES INTO CENTRAL WYOMING TONIGHT AND SATURDAY FROM THE EAST. A FEW SHOWERS ARE POSSIBLE ON SATURDAY AND SATURDAY EVENING. IT WILL BE COOLER AND MORE HUMID. SOUTHWEST WINDS WILL INCREASE SUNDAY AS THE UPPER LOW MOVES NORTH INTO MONTANA WITH WARMER AND DRIER AIR MOVING IN...THOUGH A FEW LINGERING SHOWERS AND POSSIBLY A THUNDERSTORM ARE POSSIBLE IN THE AFTERNOON AND EVENING. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...LIPSON .TODAY... SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT). MAX TEMPERATURE.....66 TO 68. MIN HUMIDITY........21-22 PERCENT. 20 FOOT WINDS.......WINDS SLOWLY VEERING FROM THE NORTH NORTHWEST TO THE NORTHEAST AT 5-9 MPH BY 1500. RIDGE TOP WINDS.....NORTHEAST AROUND 10 MPH SHIFTING TO THE WEST LATE IN THE AFTERNOON. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2800 FT AGL INCREASING TO 6100 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....NORTHEAST AROUND 12 MPH SHIFTING TO THE WEST AROUND 15 MPH LATE IN THE AFTERNOON. SMOKE DISPERSAL.....POOR TO FAIR (23100-59100 KNOT-FT). .TONIGHT... SKY/WEATHER.........MOSTLY CLEAR (25-35 PERCENT). MIN TEMPERATURE.....31-33. MAX HUMIDITY........71-74 PERCENT. 20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY FROM THE NORTHEAST AT 4-7 MPH WITH GUSTS UP TO 15 MPH IN THE EVENING. RIDGE TOP WINDS.....NORTHEAST 10 TO 15 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3300 FT AGL DECREASING TO 300 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....NORTHEAST 14 TO 17 MPH. SMOKE DISPERSAL.....POOR TO FAIR (3400-40800 KNOT-FT). .SATURDAY... SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING MOSTLY CLOUDY (70-80 PERCENT). SLIGHT CHANCE OF RAIN SHOWERS AND ISOLATED THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.....59-61. MIN HUMIDITY........23-26 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH. GUSTS UP TO 15 MPH. WINDS BECOMING NORTHEAST AT 5 TO 10 MPH BY 1500. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON. RIDGE TOP WINDS.....EAST AROUND 15 MPH. LAL.................1 UNTIL 1200...THEN 2. CHC OF WETTING RAIN.LESS THAN 5 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1600 FT AGL INCREASING TO 5200 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....EAST 15 TO 16 MPH. SMOKE DISPERSAL.....POOR TO GOOD (21400-70200 KNOT-FT). .FORECAST DAYS 3 THROUGH 5... .SATURDAY NIGHT...MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS IN THE EVENING...THEN SLIGHT CHANCE OF SHOWERS AND SNOW SHOWERS AFTER MIDNIGHT. LOWS IN THE MID 30S. WINDS GENERALLY LESS THAN 10 MPH. .SUNDAY...WARMER. PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE LOWER 40S. HIGHS IN THE UPPER 60S. SOUTHWEST WINDS AROUND 11 MPH. .MONDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE MID 40S. HIGHS IN THE UPPER 60S. WINDS GENERALLY LESS THAN 10 MPH. .TUESDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE MID 40S. HIGHS IN THE UPPER 60S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...LIPSON REQUESTED BY...R LANCASTER REASON FOR REQUEST...WFU .TAG 20090911.LITTL.01/RIW