FNUS75 KRIW 181035 FWSRIW SPOT FORECAST FOR LOWER GROS VENTRE RX...TETON INTERAGENCY DISPATCH NATIONAL WEATHER SERVICE RIVERTON WY 435 AM MDT SAT SEP 18 2010 FORECAST IS BASED ON IGNITION TIME OF 1820 MDT ON SEPTEMBER 17. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...THE TREND TODAY IN COMPARISON WITH FRIDAY WILL BE SLIGHTLY COOLER TEMPERATURES...SLIGHTLY HIGHER RELATIVE HUMIDITY AND SLIGHTLY LOWER WIND SPEEDS. SOUTHWEST FLOW WILL STRENGTHEN WITH MUCH DRIER AIR BEING PULLED UP OVER THE AREA SUNDAY AHEAD OF AN APPROACHING COLD FRONT. THE COLD FRONT WILL PUSH THROUGH MONDAY MORNING BUT MOISTURE IS EXPECTED TO BE SPARSE WITH VERY LOW CHANCES OF WETTING RAIN. DRY AND COOLER CONDITIONS ARE EXPECTED TUESDAY. ANOTHER PACIFIC TROUGH WILL BRING CHANCES OF SHOWERS TO THE AREA MAINLY LATE WEDNESDAY AND WEDNESDAY NIGHT. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...MEUNIER .TODAY... SKY/WEATHER.........SOME HIGH CLOUDS...OVERALL PARTLY CLOUDY (30-40 PERCENT). MAX TEMPERATURE.....71-74. MIN HUMIDITY........15-18 PERCENT. 20 FOOT WINDS.......EAST SOUTHEAST 5-9 MPH BECOMING SOUTH SOUTHWEST BETWEEN 1000 AND NOON. BECOMING SOUTHWEST AND INCREASING TO 8 TO 13 MPH WITH GUSTS 20 TO 25 MPH IN THE AFTERNOON RIDGE TOP WINDS.....SOUTH SOUTHWEST AROUND 10 MPH THIS MORNING BECOMING WEST SOUTHWEST 15 TO 20 MPH IN THE AFTERNOON. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1000-2000 FT AGL THROUGH 1000 INCREASING TO 9900-10500 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST AROUND 10 MPH THROUGH 1000 BECOMING WEST AND INCREASING TO 25 TO 30 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....POOR THROUGH 1000 INCREASING TO EXCELLENT IN THE AFTERNOON. .TONIGHT... SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT). MIN TEMPERATURE.....40-43. MAX HUMIDITY........51-54 PERCENT. 20 FOOT WINDS.......WEST SOUTHWEST AROUND 10 MPH WITH GUSTS NEAR 15 MPH UNTIL SUNSET...THEN BECOMING EAST SOUTHEAST 4 TO 8 MPH. RIDGE TOP WINDS.....WEST SOUTHWEST 10 TO 15 MPH THROUGH SUNSET...THEN BECOMING SOUTH 5 TO 10 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......7500-8500 FT AGL DECREASING TO 1000-2000 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH. SMOKE DISPERSAL.....VERY GOOD UNTIL SUNSET...BECOMING POOR AFTER MIDNIGHT. .SUNDAY... SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT). MAX TEMPERATURE.....75-78. MIN HUMIDITY........12-15 PERCENT. 20 FOOT WINDS.......EAST SOUTHEAST 5-9 MPH BECOMING SOUTH SOUTHWEST AROUND 10 MPH BETWEEN 1000 AND NOON. SOUTHWEST 15 TO 20 MPH WITH GUSTS 30 TO 35 MPH IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTH 10 TO 15 MPH SHIFTING TO THE SOUTHWEST AROUND 20 MPH LATE IN THE AFTERNOON. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......7000-8000 FT AGL. TRANSPORT WINDS.....SOUTHWEST AROUND 30 MPH. SMOKE DISPERSAL.....VERY GOOD TO EXCELLENT (138800-183200 KNOT-FT). .FORECAST DAYS 3 THROUGH 5... .SUNDAY NIGHT...PARTLY CLOUDY. ISOLATED SHOWERS AFTER MIDNIGHT. LOWS IN THE LOWER 40S. WINDS GENERALLY LESS THAN 10 MPH. .MONDAY...COOLER. PARTLY CLOUDY WITH SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE MID 30S. HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH. .TUESDAY...PARTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH. .WEDNESDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE UPPER 30S. HIGHS IN THE MID 60S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...MEUNIER REQUESTED BY...SEAN CAREY REASON FOR REQUEST...PRESCRIBED .TAG 20100917.LOWER.01/RIW