FNUS75 KRIW 291422 FWSRIW SPOT FORECAST FOR LOWER GROS VENTRE RX...USFS BTF NATIONAL WEATHER SERVICE RIVERTON WY 822 AM MDT TUE SEP 29 2009 FORECAST IS BASED ON IGNITION TIME OF 0730 MDT ON SEPTEMBER 29. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...SOUTH TO SOUTHWEST WINDS WILL BE ON THE INCREASE TODAY OVER WESTERN WYOMING AS A STRONG TROUGH APPROACHES. IT WILL BE DRY WITH RH'S IN THE TEENS. THE WINDS WILL CONTINUE OVERNIGHT BEFORE DIMINISHING SOME TOWARDS DAYBREAK OVER THE NORTHWEST. PRECIPITATION WILL MOVE IN AROUND DAYBREAK AS WELL WITH SNOW LEVELS LIKELY FALLING TO THE VALLEY FLOORS BY MID DAY. THE SNOW WILL CONTINUE MUCH OF THE DAY AND EVENING...TAPERING OFF OVERNIGHT. THE POTENTIAL FOR SIGNIFICANT SNOWFALL EXISTS IN THE MOUNTAINS AND POSSIBLY EVEN THE VALLEYS. THURSDAY WILL BE BRISK AND COLD WITH A FEW SNOW SHOWERS. FRIDAY WILL NOT BE AS COLD...BUT BREEZY AS THE NEXT SYSTEM APPROACHES WHICH WILL LIKELY BRING ANOTHER ROUND OF PRECIPITATION OVER THE WEEKEND. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...LIPSON .TODAY... SKY/WEATHER.........PARTLY CLOUDY (50-60 PERCENT) THEN BECOMING MOSTLY CLOUDY (70-80 PERCENT). AREAS OF SMOKE. MAX TEMPERATURE.....71 AT 7000 FEET AND 60 AT 9200 FEET. MIN HUMIDITY........13 PERCENT AT 7000 FEET AND 19 PERCENT AT 9200 FEET. 20 FOOT WINDS.......SOUTH WINDS 10 TO 20 MPH EXCEPT 15 TO 25 MPH ALONG THE WEST FORK. WINDS BECOMING SOUTHWEST AROUND 16 TO 24 MPH BY 1000. GUSTS TO AROUND 30 MPH IN THE AFTERNOON ARE EXPECTED WITH GUSTS TO 35 MPH ALONG THE HORSE CREEK. EXPECT 20 TO 30 MPH WINDS WITH GUSTS TO 35 MPH ALONG THE UPPER SADDLE THIS AFTERNOON. RIDGE TOP WINDS.....SOUTH 10 TO 15 MPH INCREASING TO SOUTHWEST AROUND 25 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.......2700 FT AGL INCREASING TO 10900 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTH 13 TO 15 MPH INCREASING TO SOUTHWEST AROUND 28 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....POOR (29200 KNOT-FT) INCREASING TO EXCELLENT (261700 KNOT-FT) IN THE AFTERNOON. .TONIGHT... SKY/WEATHER.........CLOUDY (80-90 PERCENT). AREAS OF SMOKE IN THE EVENING. SCATTERED RAIN SHOWERS AND ISOLATED THUNDERSTORMS IN THE EVENING...THEN RAIN SHOWERS LIKELY AFTER MIDNIGHT. MIN TEMPERATURE.....AROUND 40. MAX HUMIDITY........85-88 PERCENT. 20 FOOT WINDS.......SOUTH WINDS 12 TO 17 MPH WITH GUSTS TO AROUND 30 MPH. SOUTH WINDS 15 TO 20 MPH WITH GUSTS TO 35 MPH ALONG THE WEST FORK. WINDS SHIFTING TO THE SOUTHWEST AROUND 0100 MPH AT 12 TO 17 MPH EXCEPT WEST 15 TO 20 MPH WITH GUSTS TO 25 MPH THROUGH THE UPPER SADDLE. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE EVENING. RIDGE TOP WINDS.....SOUTH 20 TO 25 MPH SHIFTING TO THE WEST EARLY IN THE MORNING. LAL.................2 UNTIL 2400...THEN 1. CHC OF WETTING RAIN.25 PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2600-3600 FT AGL. TRANSPORT WINDS.....SOUTH 23 TO 29 MPH SHIFTING TO THE WEST EARLY IN THE MORNING. SMOKE DISPERSAL.....POOR TO GOOD (39900-87100 KNOT-FT). .WEDNESDAY... SKY/WEATHER.........CLOUDY (95-100 PERCENT). RAIN SHOWERS AND SNOW SHOWERS. MAX TEMPERATURE.....45 AT 7000 FEET BUT TEMPERATURES FALLING TO 34 AT 9200 FEET. MIN HUMIDITY........60 PERCENT AT 7000 FEET AND 92 PERCENT AT 9200 FEET. 20 FOOT WINDS.......WEST AROUND 10 MPH LATE IN THE AFTERNOON. GUSTS UP TO 20 MPH...ESPECIALLY ACROSS THE UPPER SADDLE. 10 MPH WINDS BECOMING NORTHWEST BY 2300. RIDGE TOP WINDS.....SOUTHWEST AROUND 15 MPH SHIFTING TO THE WEST IN THE LATE MORNING AND AFTERNOON. LAL.................1. CHC OF WETTING RAIN.100 PERCENT. HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3500 FT AGL. TRANSPORT WINDS.....SOUTHWEST AROUND 22 MPH SHIFTING TO THE WEST 18 TO 21 MPH IN THE LATE MORNING AND AFTERNOON. SMOKE DISPERSAL.....FAIR (48000-57200 KNOT-FT). .FORECAST DAYS 3 THROUGH 5... .WEDNESDAY NIGHT...COLDER...CLOUDY. SNOW SHOWERS IN THE EVENING... THEN CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. LOWS IN THE LOWER 20S. NORTHWEST WINDS AROUND 11 MPH. .THURSDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SNOW SHOWERS. LOWS AROUND 19. HIGHS IN THE LOWER 30S. WINDS GENERALLY LESS THAN 10 MPH. .FRIDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SNOW SHOWERS. LOWS AROUND 30. HIGHS IN THE UPPER 30S. WINDS GENERALLY LESS THAN 10 MPH. .SATURDAY...MOSTLY CLOUDY WITH CHANCE OF SNOW SHOWERS AND SLIGHT CHANCE OF SHOWERS. LOWS AROUND 30. HIGHS IN THE UPPER 30S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...LIPSON REQUESTED BY...MACK REASON FOR REQUEST...PRESCRIBED .TAG 20090929.LOWER.01/RIW