FNUS75 KRIW 212117 FWSRIW SPOT FORECAST FOR BULL...IA TDC NATIONAL WEATHER SERVICE RIVERTON WY 317 PM MDT TUE SEP 21 2010 FORECAST IS BASED ON IGNITION TIME OF 1500 MDT ON SEPTEMBER 21. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...OTHER THAN A FEW CUMULUS CLOUDS AROUND...IT WILL BE MOSTLY CLEAR THROUGH THIS EVENING AND MOST LIKELY THROUGH THE NIGHT. CLOUDS WILL BE ON THE INCREASE ON WEDNESDAY AS MOISTURE MOVES UP FROM THE SOUTH AND A UPPER LEVEL TROUGH APPROACHES FROM THE WEST. ISOLATED SHOWERS AND LATE DAY THUNDERSTORMS ARE POSSIBLE ON WEDNESDAY. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...SKRBAC .TODAY... SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT). MAX TEMPERATURE.....70-74 BOTTOM AND 60-64 ON TOP AT 8500 FEET. MIN HUMIDITY........20-22 PERCENT. 20 FOOT WINDS.......SOUTHWEST 6-12 MPH LOWEST ELEVATIONS WITH SOUTHWEST WINDS 12 TO 15 MPH WITH GUSTS TO AROUND 25 MPH ABOVE 7500 FEET OR EXPOSED LOCATIONS. RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH WITH GUSTS TO 30 MPH OVER EXPOSED RIDGES. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......6600-7600 FT AGL. TRANSPORT WINDS.....SOUTHWEST 20 TO 25 MPH. SMOKE DISPERSAL.....VERY GOOD (147000 KNOT-FT). .TONIGHT... SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT). MIN TEMPERATURE.....AROUND 30-33 BOTTOM AND AROUND 40 MID SLOPE. MAX HUMIDITY........65-72 PERCENT BOTTOM AND 40-46 PERCENT MID SLOPE. 20 FOOT WINDS.......SOUTHWEST WINDS AROUND 10 MPH EARLY IN THE EVENING BECOMING DOWNSLOPE/DOWNVALLEY 4-7 MPH. EVENING GUSTS 15 TO 20 MPH OPEN AND EXPOSED LOCATIONS. RIDGE TOP WINDS.....SOUTHWEST 20 TO 25 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......4700-5700 FT AGL DECREASING TO 900-1900 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....SOUTHWEST 13 TO 18 MPH. SMOKE DISPERSAL.....GOOD (75000 KNOT-FT) DECREASING TO POOR (10400 KNOT-FT) AFTER MIDNIGHT. .WEDNESDAY... SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT) THEN BECOMING MOSTLY CLOUDY (55-65 PERCENT). ISOLATED RAIN SHOWERS AND THUNDERSTORMS POSSIBLE AFTER NOON. MAX TEMPERATURE.....66-70 BOTTOM AND 56-60 TOP. MIN HUMIDITY........24-29 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTH TO SOUTHWEST 10 TO 12 MPH IN THE AFTERNOON. GUSTS UP TO 20 MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTH AROUND 15 MPH SHIFTING TO THE SOUTHWEST LATE IN THE AFTERNOON. LAL.................1 UNTIL 1200...THEN 2. CHC OF WETTING RAIN.4 PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3500-4500 FT AGL INCREASING TO 7500-8000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTH 16 TO 18 MPH SHIFTING TO THE SOUTHWEST LATE IN THE AFTERNOON. SMOKE DISPERSAL.....GOOD (65000 KNOT-FT) INCREASING TO VERY GOOD (133800 KNOT-FT) IN THE AFTERNOON. .FORECAST DAYS 3 THROUGH 5... .WEDNESDAY NIGHT...PARTLY CLOUDY. ISOLATED SHOWERS AND THUNDERSTORMS IN THE EVENING...THEN SLIGHT CHANCE OF RAIN AFTER MIDNIGHT. LOWS IN THE MID 30S. WINDS GENERALLY LESS THAN 10 MPH. .THURSDAY...MOSTLY CLEAR. LOWS IN THE LOWER 30S. HIGHS IN THE MID 50S. WINDS GENERALLY LESS THAN 10 MPH. .FRIDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH. .SATURDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE UPPER 60S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...SKRBAC REQUESTED BY...STRAUBURG REASON FOR REQUEST...PRESCRIBED .TAG 20100921.BULL_.01/RIW