FNUS75 KRIW 211522 AAA FWSRIW SPOT FORECAST FOR BRADLEY MOUNTAIN...UPDATED NATIONAL WEATHER SERVICE RIVERTON WY 922 AM MDT THU MAY 21 2009 FORECAST IS BASED ON IGNITION TIME OF 0805 MDT ON MAY 21. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... A WEAK UPPER LEVEL LOW PRESSURE SYSTEM WILL MOVE ACROSS NORTHERN MONTANA TODAY. THIS SYSTEM WILL BRING A DRY AIRMASS INTO WESTERN WYOMING TODAY WITH FAIRLY LIGHT WEST WINDS IN THE HIGHER ELEVATIONS AND UPSLOPE WINDS IN THE MID AND LOWER ELEVATIONS. WEAK SURFACE HIGH PRESSURE WILL MOVE ACROSS WESTERN WYOMING TONIGHT AND FRIDAY WITH A CONTINUED LIGHT WIND FLOW PATTERN. LOW LEVEL MOISTURE WILL INCREASE SLIGHTLY DURING THE DAY FRIDAY...AS THE FRINGE OF MOISTURE TO THE SOUTH MOVES NORTHWARD INTO WESTERN WYOMING. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...SMITH .TODAY... SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT). MAX TEMPERATURE.....55-58 BETWEEN 5600 AND 6000 FEET. 46-49 BETWEEN 8500 AND 8900 FEET. MIN HUMIDITY........17-20 PERCENT BETWEEN 5600 AND 6000 FEET. 23-26 PERCENT BETWEEN 8500 AND 8900 FEET. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BELOW 7500 FEET. WEST WINDS 5 TO 10 MPH ABOVE 7500 FEET. RIDGE TOP WINDS.....SOUTHEAST AROUND 10 MPH SHIFTING TO THE WEST BETWEEN 10 TO 15 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.......4000 FT AGL INCREASING TO 7000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHEAST 5 TO 8 MPH SHIFTING TO THE SOUTHWEST 10 TO 14 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....POOR TO GOOD (30800-80200 KNOT-FT). .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT). MIN TEMPERATURE.....34-37 BETWEEN 5600 AND 6000 FEET. 38-41 BETWEEN 8500 AND 8900 FEET. MAX HUMIDITY........48-51 PERCENT BETWEEN 5600 AND 6000 FEET. 35-38 PERCENT BETWEEN 8500 AND 9000 FEET. 20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4-7 MPH. RIDGE TOP WINDS.....WEST 5 TO 10 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......4000 FT AGL DECREASING TO 800 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....NORTHWEST 7 TO 10 MPH. SMOKE DISPERSAL.....POOR (4600-31600 KNOT-FT). .FRIDAY... SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT). MAX TEMPERATURE.....60-63 BETWEEN 5600 AND 6000 FEET. 52-55 BETWEEN 8500 AND 8900 FEET. MIN HUMIDITY........23-26 PERCENT BETWEEN 5600 AND 6000 FEET. 28-31 PERCENT BETWEEN 8500 AND 8900 FEET. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH. RIDGE TOP WINDS.....WEST AROUND 5 MPH...SHIFTING TO THE NORTHWEST 5 TO 10 MPH 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.......4500 FT AGL INCREASING TO 8000 FT AGL AFTER 1400 TRANSPORT WINDS.....WEST 5 TO 10 MPH. SMOKE DISPERSAL.....POOR (19700 KNOT-FT) UNTIL 1400...THEN GOOD (63700 KNOT-FT) FROM 1400 TO 1700. .FORECAST DAYS 3 THROUGH 5... .FRIDAY NIGHT...PARTLY CLOUDY. LOWS IN THE UPPER 30S. WINDS GENERALLY LESS THAN 10 MPH. .SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE UPPER 30S. HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH. .SUNDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE UPPER 30S. HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH. .MEMORIAL DAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE UPPER 30S. HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...SMITH REQUESTED BY...KIRK STROM REASON FOR REQUEST...PRESCRIBED .TAG 20090521.BRADL.01/RIW