FNUS75 KRIW 281341 FWSRIW SPOT FORECAST FOR LOWER GROS VENTRE RX...USFS BTF NATIONAL WEATHER SERVICE RIVERTON WY 741 AM MDT MON SEP 28 2009 FORECAST IS BASED ON IGNITION TIME OF 0735 MDT ON SEPTEMBER 27. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... UPPER RIDGE OF HIGH PRESSURE WILL MOVE EAST OF THE AREA TODAY LEADING TO AN INCREASING SOUTHWEST FLOW ALOFT LATER TODAY THROUGH TUESDAY. INCREASING BOUNDARY LAYER SOUTH TO SOUTHWEST SURFACE FLOW IS ALSO EXPECTED ACROSS THE AREA TUESDAY AFTERNOON. IT WILL BE DRY WITH ONLY SOME HIGH CLOUDS EXPECTED LATER TODAY THROUGH TUESDAY MORNING. AN ISOLATED HIGHER BASED SHOWER OR THUNDERSTORM IS POSSIBLE LATE TUESDAY AFTERNOON. A STRONG WEATHER SYSTEM AND COLD FRONT WILL PUSH INTO THE AREA TUESDAY EVENING WITH STRONG SOUTHWEST WINDS...AND INCREASING CHANCE OF SHOWERS AND DROPPING TEMPERATURES. THE VERY LOW RELATIVE HUMIDITIES ARE EXPECTED ONCE AGAIN TODAY. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...SKRBAC/SMITH .TODAY... SKY/WEATHER.........SUNNY (5-15 PERCENT). AREAS OF SMOKE. MAX TEMPERATURE.....61-64. MIN HUMIDITY........15-18 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHWEST AROUND 10 MPH LATE IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTH 15 TO 20 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3500 FT AGL INCREASING TO 6500 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTH 20 TO 25 MPH. SMOKE DISPERSAL.....FAIR (46700 KNOT-FT) INCREASING TO VERY GOOD (102400 KNOT-FT) IN THE AFTERNOON. .TONIGHT... SKY/WEATHER.........MOSTLY CLEAR (10-15 PERCENT). AREAS OF SMOKE. MIN TEMPERATURE.....43-46. MAX HUMIDITY........35-38 PERCENT. 20 FOOT WINDS.......SOUTHWEST WINDS 5 TO 10 MPH WITH GUSTS TO 15 MPH. RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2500-3500 FT AGL. TRANSPORT WINDS.....SOUTHWEST AROUND 20 MPH. SMOKE DISPERSAL.....POOR TO GOOD (38900-73700 KNOT-FT). .TUESDAY... SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). AREAS OF SMOKE IN THE MORNING. SLIGHT CHANCE OF RAIN SHOWERS AND ISOLATED THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.....59-62. MIN HUMIDITY........20-23 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHWEST 10 TO 15 MPH WITH GUSTS TO AROUND 25 MPH IN THE AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH INCREASING TO AROUND 25 MPH LATE IN THE AFTERNOON. LAL.................1 UNTIL 1200...THEN 2. CHC OF WETTING RAIN.3 PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3500 FT AGL INCREASING TO 9500 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST 20 TO 25 MPH. SMOKE DISPERSAL.....GOOD (67700 KNOT-FT) INCREASING TO EXCELLENT (209500 KNOT-FT) IN THE AFTERNOON. .FORECAST DAYS 3 THROUGH 5... .TUESDAY NIGHT...CLOUDY. CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS IN THE EVENING...THEN SHOWERS LIKELY AND ISOLATED THUNDERSTORMS AFTER MIDNIGHT. LOWS IN THE LOWER 40S. SOUTHWEST WINDS AROUND 12 MPH. .WEDNESDAY...COLDER. SHOWERS AND SNOW SHOWERS. LOWS IN THE LOWER 20S. HIGHS IN THE LOWER 40S. WEST WINDS AROUND 10 MPH. .THURSDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SNOW. LOWS IN THE LOWER 20S. HIGHS IN THE LOWER 30S. WINDS GENERALLY LESS THAN 10 MPH. .FRIDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS IN THE UPPER 30S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...SKRBAC/SMITH REQUESTED BY...MACK REASON FOR REQUEST...PRESCRIBED .TAG 20090927.LOWER.01/RIW