FNUS75 KRIW 170132 FWSRIW SPOT FORECAST FOR DRY ISLAND...USFS BTF NATIONAL WEATHER SERVICE RIVERTON WY 732 PM MDT SAT OCT 16 2010 FORECAST IS BASED ON REQUEST TIME OF 1858 MDT ON OCTOBER 16. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... WESTERLY FLOW ALOFT WILL ALLOW FOR MORE CLOUD COVER THAN PAST DAYS BUT THERE WILL BE LITTLE CHANGE TO TEMPERATURES AND RELATIVE HUMIDITY. A WEATHER SYSTEM TO THE NORTH WILL QUICKLY SWEEP ACROSS THE STATE LATE SUNDAY AND OVERNIGHT...BUT LITTLE PRECIPITATION IS EXPECTED. HOWEVER...THE PASSAGE OF THIS SYSTEM WILL INCREASE WEST WIND SUNDAY AFTERNOON AND EARLY EVENING. BY LATE MONDAY...A RIDGE OF HIGH PRESSURE WILL TAKE SHAPE OVER WYOMING AND PREVAIL THROUGH AT LEAST MIDWEEK. SLIGHTLY WARMER THAN AVERAGE TEMPERATURES AND DRY CONDITIONS ARE EXPECTED WITH THIS HIGH PRESSURE IN PLACE. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...JONES .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). MIN TEMPERATURE.....22-25. MAX HUMIDITY........88-91 PERCENT. 20 FOOT WINDS.......SOUTHWEST WINDS 5 TO 8 MPH UNTIL 2000...THEN BECOMING DOWNSLOPE/DOWNVALLEY 3 TO 7 MPH BY 2200. RIDGE TOP WINDS.....SOUTH-SOUTHWEST 11 TO 16 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......DECREASING TO LESS THAN 500 FT AGL BY 2200. TRANSPORT WINDS.....SOUTHWEST 5 TO 10 MPH UNTIL 2000...THEN BECOMING DOWNSLOPE/DOWNVALLEY 5 TO 8 MPH BY 2200. SMOKE DISPERSAL.....BECOMING POOR BY 2000. .SUNDAY... SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT) WITH ISOLATED RAIN SHOWERS AFTER 1200. MAX TEMPERATURE.....56-59. MIN HUMIDITY........31-34 PERCENT. 20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 3 TO 6 MPH UNTIL 1000... THEN BECOMING UPSLOPE/UPVALLEY 5 TO 9 MPH BY 1200. WIND BECOMING WEST 12 TO 16 MPH WITH GUSTS AROUND 25 MPH BETWEEN 1400 AND 1500. RIDGE TOP WINDS.....SOUTH-SOUTHWEST AROUND 10 MPH UNTIL 1100... THEN BECOMING WEST 15 TO 20 MPH BY 1300. LAL.................1. CHC OF WETTING RAIN.5 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......LESS THAN 1000 FT UNTIL 1000...THEN GRADUALLY INCREASING TO AROUND 6000 FT AGL BY 1400. TRANSPORT WINDS.....DOWNSLOPE/DOWNVALLEY UNTIL 0900...THEN BECOMING UPSLOPE/UPVALLEY 6 TO 10 MPH BY 1100. WIND GRADUALLY INCREASING FROM THE WEST TO AROUND 20 MPH BY 1300. SMOKE DISPERSAL.....POOR UNTIL 1000...THEN GRADUALLY BECOMING VERY GOOD BY 1400. .FORECAST DAYS 3 THROUGH 5... .SUNDAY NIGHT...PARTLY CLOUDY. ISOLATED SHOWERS IN THE EVENING... POSSIBLY MIXING WITH SNOW AFTER MIDNIGHT. LOWS IN THE UPPER 20S. WINDS GENERALLY LESS THAN 10 MPH. .MONDAY...BECOMING MOSTLY CLEAR. LOWS IN THE LOWER 20S. HIGHS IN THE MID 50S. WINDS GENERALLY LESS THAN 10 MPH. .TUESDAY...MOSTLY CLEAR. LOWS IN THE MID 20S. HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH. .WEDNESDAY...MOSTLY CLEAR. LOWS IN THE UPPER 20S. HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH. .THURSDAY...MOSTLY CLEAR. LOWS IN THE UPPER 20S. HIGHS IN THE MID 50S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...JONES REQUESTED BY...HUTTA REASON FOR REQUEST...WILDFIRE .TAG 20101016.DRYIS.01/RIW