FNUS75 KRIW 211104 FWSRIW SPOT FORECAST FOR BULL...IA TDC NATIONAL WEATHER SERVICE RIVERTON WY 504 AM MDT SAT AUG 21 2010 FORECAST IS BASED ON REQUEST TIME OF 1931 MDT ON AUGUST 20. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...SOUTHWEST FLOW WILL CONTINUE TO INCREASE TODAY AND TONIGHT AHEAD OF A STRONG COLD FRONT DUE TO PASS THROUGH THE AREA SUNDAY AFTERNOON. THE TREND TODAY WILL BE WARMER...WINDIER AND DRIER THAN FRIDAY WITH WINDS PICKING UP DURING THE MORNING. ISOLATED THUNDERSTORMS WILL BEGIN PUSHING INTO WESTERN WYOMING OVERNIGHT TONIGHT. WINDS AT RIDGE TOP LEVEL ARE EXPECTED TO PERSIST WITH STRONGER GUSTS DEVELOPING OVERNIGHT. MORE CLOUDS AND HIGHER RELATIVE HUMIDITY ARE EXPECTED SUNDAY ALONG WITH SCATTERED THUNDERSTORMS AND WINDY CONDITIONS WITH THE PASSAGE OF THE COLD FRONT. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...MEUNIER .TODAY... SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT). MAX TEMPERATURE.....79-84 BELOW 7800 FEET...73-78 ABOVE 7800 FEET. MIN HUMIDITY........14-17 PERCENT BELOW 7800 FEET...18-21 PERCENT ABOVE 7800 FEET. 20 FOOT WINDS.......EAST OR UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHWEST 17 TO 22 MPH WITH GUSTS OF 30 TO 35 MPH BETWEEN NOON AND 1400L. RIDGE TOP WINDS.....SOUTH 10 TO 15 MPH BECOMING SOUTHWEST AROUND 25 MPH IN THE AFTERNOON. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......4100-5100 FT AGL INCREASING TO 9000-10000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST AT 20 TO 25 MPH. SMOKE DISPERSAL.....GOOD (68700 KNOT-FT) INCREASING TO EXCELLENT (177600 KNOT-FT) IN THE AFTERNOON. .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT). SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH THE NIGHT. MIN TEMPERATURE.....50-53. MAX HUMIDITY........57-60 PERCENT. 20 FOOT WINDS.......SOUTHWEST 15 TO 20 MPH WITH GUSTS 25 TO 30 MPH IN THE EVENING BECOMING SOUTH SOUTHEAST 5 TO 10 MPH AROUND MIDNIGHT. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS. RIDGE TOP WINDS.....SOUTH SOUTHWEST 20 TO 25 MPH WITH GUSTS OF 35 TO 40 MPH AFTER MIDNIGHT. LAL.................2. CHC OF WETTING RAIN.LESS THAN 5 PERCENT. HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......5800-6800 FT AGL DECREASING TO 2000 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....SOUTH AT 20 TO 25 MPH. SMOKE DISPERSAL.....VERY GOOD...DECREASING TO FAIR AFTER MIDNIGHT. .SUNDAY... SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). SCATTERED SHOWERS AND THUNDERSTORMS. MAX TEMPERATURE.....66-69. MIN HUMIDITY........24-27 PERCENT. 20 FOOT WINDS.......SOUTHEAST 5 TO 10 MPH IN THE MORNING BECOMING SOUTHWEST 15 TO 20 MPH WITH GUSTS TO 30 MPH BY NOON. . GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS. RIDGE TOP WINDS.....SOUTHWEST AROUND 25 MPH. LAL.................2. CHC OF WETTING RAIN.20 PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2700-3700 FT AGL INCREASING TO 6200-7200 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST 20 TO 25 MPH. SMOKE DISPERSAL.....FAIR...INCREASING TO VERY GOOD IN THE AFTERNOON. .FORECAST DAYS 3 THROUGH 5... .SUNDAY NIGHT...PARTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS IN THE EVENING...THEN SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. WINDS GENERALLY LESS THAN 10 MPH. .MONDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH. .TUESDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH. .WEDNESDAY...MOSTLY CLEAR. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS IN THE MID 40S. HIGHS IN THE UPPER 60S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...MEUNIER REQUESTED BY...BULL OBS REASON FOR REQUEST...WILDFIRE .TAG 20100820.BULL_.01/RIW