FNUS75 KRIW 291037 FWSRIW SPOT FORECAST FOR GRAVEL...IA TDC NATIONAL WEATHER SERVICE RIVERTON WY 437 AM MDT SUN AUG 29 2010 FORECAST IS BASED ON REQUEST TIME OF 1633 MDT ON AUGUST 28. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...A NEARLY STATIONARY FRONT WILL BE OVER THE AREA TODAY UNDER A SOUTH SOUTHWEST FLOW ALOFT. RADAR WAS SHOWING ISOLATED SHOWERS AND THUNDERSTORMS MOVING NE ALONG THIS FRONTAL BOUNDARY THIS MORNING. THIS ISOLATED ACTIVITY WILL CONTINUE THROUGH THE MORNING WITH SHOWERS AND THUNDERSTORMS BECOMING MORE NUMEROUS IN THE AFTERNOON. THE FRONT WILL SURGE EASTWARD LATE THIS AFTERNOON AND EVENING WITH DECREASING SHOWERS AND THUNDERSTORMS THROUGH THE EVENING ALONG WITH A MUCH COOLER AIRMASS MOVING IN. RAIN AND SNOW SHOWERS WILL INCREASE THROUGH MONDAY MORNING AS A SECOND COLD FRONT PUSHES AN EVEN COLDER AIRMASS INTO WESTERN WYOMING. COLD AND WET WEATHER WILL CONTINUE INTO MONDAY NIGHT WITH SOME DRYING TUESDAY MORNING. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...MEUNIER .TODAY... SKY/WEATHER.........PARTLY CLOUDY (55-65 PERCENT) THEN BECOMING MOSTLY CLOUDY (65-75 PERCENT). ISOLATED SHOWERS AND THUNDERSTORMS IN THE MORNING. SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.....60-63. MIN HUMIDITY........37-40 PERCENT. 20 FOOT WINDS.......EAST TO SOUTHEAST 4-7 MPH BECOMING SOUTH SOUTHWEST SOUTHWEST 5-9 MPH BETWEEN 0900 AND NOON AND INCREASING TO 8 TO 13 MPH WITH GUSTS NEAR 20 MPH BY 1400L. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON WITH THESE OUTFLOWS LIKELY DOMINATING THE WIND FIELD AFTER 1500L. RIDGE TOP WINDS.....SOUTH AROUND 15 MPH INCREASING TO SOUTHWEST AROUND 25 MPH IN THE AFTERNOON. LAL.................2. CHC OF WETTING RAIN.25 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......4200-5200 FT AGL INCREASING TO 7000-8000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTH 15 TO 20 MPH SHIFTING TO THE SOUTHWEST 30 TO TO 35 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....GOOD (87900 KNOT-FT) INCREASING TO EXCELLENT (150500 KNOT-FT) IN THE AFTERNOON. .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). SCATTERED SHOWERS AND ISOLATED EVENING THUNDERSTORMS. MIN TEMPERATURE.....37-40. MAX HUMIDITY........82-85 PERCENT. 20 FOOT WINDS.......SOUTHWEST WINDS 5 TO 10 MPH WITH GUSTS 15 TO 20 MPH EARLY EVENING SHIFTING TO THE WEST NORTHWEST AROUND SUNSET...THEN BECOMING EAST 4 TO 7 MPH AFTER MIDNIGHT. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE EVENING. RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH BECOMING WEST AROUND 10 MPH AROUND 2000L...THEN SHIFTING TO THE EAST AFTER MIDNIGHT. LAL.................2. CHC OF WETTING RAIN.20 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3500-4500 FT AGL DECREASING TO 1100-1600 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....SOUTHWEST AROUND 23 MPH BECOMING WEST AROUND 13 MPH LATE IN THE EVENING...THEN SHIFTING TO THE NORTHEAST 5 TO 10 MPH AFTER MIDNIGHT. SMOKE DISPERSAL.....GOOD (73600 KNOT-FT) DECREASING TO POOR (3900 KNOT-FT) AFTER MIDNIGHT. .MONDAY... SKY/WEATHER.........CLOUDY (80-90 PERCENT). SCATTERED RAIN SHOWERS AND SNOW SHOWERS IN THE MORNING...THEN NUMEROUS RAIN AND SHOWERS IN THE AFTERNOON. MAX TEMPERATURE.....45-48. MIN HUMIDITY........55-60 PERCENT. 20 FOOT WINDS.......EAST 4-7 MPH BECOMING WEST SOUTHWEST 8 TO TO 13 MPH WITH GUSTS TO AROUND 25 MPH IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTH AROUND 10 MPH INCREASING TO SOUTHWEST AROUND 20 MPH IN THE AFTERNOON. LAL.................1. CHC OF WETTING RAIN.50 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3700-4700 FT AGL INCREASING TO 6200-6800 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST 12 TO 21 MPH SHIFTING TO THE WEST AROUND 24 MPH LATE IN THE AFTERNOON. SMOKE DISPERSAL.....FAIR (52100 KNOT-FT) INCREASING TO VERY GOOD (112400 KNOT-FT) IN THE AFTERNOON. .FORECAST DAYS 3 THROUGH 5... .MONDAY NIGHT...MOSTLY CLOUDY. SCATTERED SHOWERS...SNOW SHOWERS AND ISOLATED THUNDERSTORMS IN THE EVENING...THEN SCATTERED SNOW SHOWERS AFTER MIDNIGHT. LOWS IN THE LOWER 30S. WINDS GENERALLY LESS THAN 10 MPH. .TUESDAY...PARTLY CLOUDY WITH ISOLATED SHOWERS...THUNDERSTORMS AND SNOW SHOWERS. LOWS AROUND 30. HIGHS IN THE MID 50S. WINDS GENERALLY LESS THAN 10 MPH. .WEDNESDAY...PARTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH. .THURSDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...MEUNIER REQUESTED BY...TIDC REASON FOR REQUEST...WILDFIRE .TAG 20100828.GRAVE.01/RIW