FNUS75 KRIW 171541 FWSRIW SPOT FORECAST FOR PORCUPINE FIRE...IA TDC NATIONAL WEATHER SERVICE RIVERTON WY 941 AM MDT MON AUG 17 2009 FORECAST IS BASED ON REQUEST TIME OF 0904 MDT ON AUGUST 17. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...THE DRYING AND WARMING TREND WILL CONTINUE TODAY AND TUESDAY. ISOLATED SHOWERS AND THUNDERSTORMS ARE POSSIBLE...WITH GUSTY WINDS AND LIGHTNING BEING THE PRIMARY HAZARDS. A DISTURBANCE WILL MOVE ACROSS CENTRAL AND EASTERN MONTANA TUESDAY BRINGING THE RETURN OF ISOLATED THUNDERSTORMS. A STRONGER SYSTEM WILL TAKE A SIMILAR TRACK ON WEDNESDAY WITH COOLER TEMPERATURES. RIDGE BUILDS IN THURSDAY AND ON THROUGH THE WEEKEND WITH SOME MONSOONAL MOISTURE POSSIBLY MOVING IN OVER THE WEEKEND. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...LIPSON .TODAY... SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT) THEN BECOMING PARTLY CLOUDY (45-55 PERCENT). ISOLATED SHOWERS AND THUNDERSTORMS IN THE AFTERNOON BEGINNING AROUND 1300. MAX TEMPERATURE.....59 TO 62. MIN HUMIDITY........31 PERCENT AT 8200 FEET AND 35 PERCENT AT 8800 FEET. 20 FOOT WINDS.......SOUTH SOUTHWEST 4 TO 8 MPH BECOMING WEST SOUTHWEST AT 5 TO 10 MPH BY 1200. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTHEAST AROUND 10 MPH...THEN SHIFTING TO THE WEST 10 TO 15 MPH IN THE AFTERNOON. LAL.................1 UNTIL 1200...THEN 2. CHC OF WETTING RAIN.LESS THAN 5 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3700 FT AGL INCREASING TO 8000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHEAST AROUND 13 MPH...THEN SHIFTING TO THE WEST 14 TO 15 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....POOR (17800 KNOT-FT) INCREASING TO GOOD (96400 KNOT-FT) IN THE AFTERNOON. .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT). ISOLATED SHOWERS AND THUNDERSTORMS IN THE EVENING. MIN TEMPERATURE.....40-43. MAX HUMIDITY........61 TO 65 PERCENT. 20 FOOT WINDS.......EAST TO NORTHEAST 4-7 MPH. GUSTS UP TO 15 MPH IN THE EVENING. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE EVENING. RIDGE TOP WINDS.....NORTHEAST 10 TO 15 MPH. LAL.................2 UNTIL 2400...THEN 1. CHC OF WETTING RAIN.LESS THAN 5 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......4700 FT AGL DECREASING TO 700 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....NORTHEAST 13 TO 16 MPH. SMOKE DISPERSAL.....POOR TO FAIR (7900-56200 KNOT-FT). .TUESDAY... SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT). MAX TEMPERATURE.....62-65. MIN HUMIDITY........24-28 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH. WINDS BECOMING WEST NORTHWEST 5 TO 10 MPH BECOMING 10 TO 15 MPH BY 1400. RIDGE TOP WINDS.....EAST 10 TO 15 MPH SHIFTING TO THE WEST IN THE AFTERNOON. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3300 FT AGL INCREASING TO 7200 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....EAST 13 TO 15 MPH SHIFTING TO THE WEST 16 TO 18 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....POOR (38300 KNOT-FT) INCREASING TO VERY GOOD (106700 KNOT-FT) IN THE AFTERNOON. .FORECAST DAYS 3 THROUGH 5... .TUESDAY NIGHT...MOSTLY CLEAR. LOWS IN THE LOWER 40S. WEST WINDS AROUND 11 MPH. .WEDNESDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE LOWER 60S. NORTHWEST WINDS AROUND 11 MPH. .THURSDAY...MOSTLY CLEAR. LOWS IN THE MID 40S. HIGHS IN THE UPPER 60S. WINDS GENERALLY LESS THAN 10 MPH. .FRIDAY...PARTLY CLOUDY. LOWS IN THE MID 40S. HIGHS IN THE LOWER 70S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...LIPSON REQUESTED BY...CODY MCFARLAND REASON FOR REQUEST...WILDFIRE .TAG 20090817.PORCU.01/RIW