FNUS75 KRIW 191639 FWSRIW SPOT FORECAST FOR MILL CREEK...IA CDC NATIONAL WEATHER SERVICE RIVERTON WY 1039 AM MDT MON APR 19 2010 FORECAST IS BASED ON IGNITION TIME OF 1020 MDT ON APRIL 19. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... A WEAK LOW PRESSURE AREA WILL PASS ACROSS SOUTHEASTERN MONTANA THIS AFTERNOON. THERE WILL ADEQUATE MOISTURE AND INSTABILITY TO PRODUCE ISOLATED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS ACROSS THE AREA WITH ONLY A VERY SMALL CHANCE OF WETTING RAIN. AN INVERSION WILL FORM AFTER MIDNIGHT AND DROP TO AROUND 500 FEET BY 0400 MDT TUESDAY. THE INVERSION WILL LIFT EARLY TUESDAY AFTERNOON. THERE WILL BE A SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS TUESDAY. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...SMITH .TODAY... SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT) THEN BECOMING PARTLY CLOUDY (50-60 PERCENT). ISOLATED SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.....51-54. MIN HUMIDITY........20-23 PERCENT. WIND (20 FT)........UPSLOPE/UPVALLEY 5-9 MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON. RIDGE TOP WINDS.....WEST 5 TO 10 MPH. LAL.................1 UNTIL 1400 MDT...THEN 2. CWR.................LESS THAN 5 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......5000 FT AGL INCREASING TO 9000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....WEST AROUND 10 MPH. SMOKE DISPERSAL.....FAIR (42200 KNOT-FT). .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT). ISOLATED SHOWERS AND THUNDERSTORMS IN THE EVENING. MIN TEMPERATURE.....34-37. MAX HUMIDITY........55-58 PERCENT. WIND (20 FT)........DOWNSLOPE/DOWNVALLEY 4-7 MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE EVENING. RIDGE TOP WINDS.....SOUTHWEST 5 TO 10 MPH. LAL.................2 UNTIL 2000...THEN 1. CWR.................LESS THAN 5 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......5000 FT AGL DECREASING TO 500 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....WEST AROUND 10 MPH. SMOKE DISPERSAL.....FAIR (43900 KNOT-FT) UNTIL 2200 MDT...THEN POOR (6500-11400 KNOT-FEET). .TUESDAY... SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT) THEN BECOMING MOSTLY CLOUDY (60-70 PERCENT). ISOLATED SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.....50-53. MIN HUMIDITY........22-25 PERCENT. WIND (20 FT)........UPSLOPE/UPVALLEY 5-9 MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTHEAST 5 TO 10 MPH. LAL.................1 UNTIL 1500 MDT...THEN 2. CWR.................LESS THAN 5 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1000 FT AGL INCREASING TO 9000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHEAST AROUND 10 MPH. SMOKE DISPERSAL.....POOR (11100 KNOT-FT) UNTIL 1300 MDT...THEN FAIR (52500 KNOT-FT) IN THE AFTERNOON. .FORECAST DAYS 3 THROUGH 5... .TUESDAY NIGHT...MOSTLY CLOUDY. ISOLATED SHOWERS AND THUNDERSTORMS IN THE EVENING...THEN ISOLATED SHOWERS AND SNOW SHOWERS AFTER MIDNIGHT. LOWS IN THE MID 30S. WINDS GENERALLY LESS THAN 10 MPH. .WEDNESDAY...MOSTLY CLOUDY. CHANCE OF SHOWERS...SNOW SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS IN THE UPPER 40S. WINDS GENERALLY LESS THAN 10 MPH. .THURSDAY...CLOUDY WITH CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE UPPER 20S. HIGHS IN THE LOWER 40S. WINDS GENERALLY LESS THAN 10 MPH. .FRIDAY...CLOUDY WITH RAIN AND SNOW LIKELY. LOWS IN THE MID 20S. HIGHS IN THE MID 30S. NORTH WINDS AROUND 15 MPH. $$ FORECASTER...SMITH REQUESTED BY...BOB EVANS REASON FOR REQUEST...PRESCRIBED .TAG 20100419.MILLC.01/RIW