FNUS75 KRIW 291623 FWSRIW SPOT FORECAST FOR BIG FORK...IA CDC NATIONAL WEATHER SERVICE RIVERTON WY 1023 AM MDT MON APR 29 2013 FORECAST IS BASED ON REQUEST TIME OF 0955 MDT ON APRIL 29. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... WARMING TEMPERATURES WILL ALLOW INSTABILITY OVER THE FIRE TODAY...WITH THE POTENTIAL FOR SOME THUNDERSTORM ACTIVITY DURING THE AFTERNOON. GUSTY AND ERRATIC WIND IS THE PRIMARY CONCERN WITH ANY THUNDERSTORM DEVELOPMENT TODAY. AN APPROACHING DISTURBANCE WILL TIGHTEN THE PRESSURE GRADIENT OVER THE FIRE BY THIS AFTERNOON...WITH GUSTY TO BREEZY WIND DEVELOPING. THE COLD FRONT WILL MOVE THROUGH THE FIRE THIS EVENING...SHIFTING WIND TO THE NORTH AND HELPING ANY REMAINING THUNDERSTORMS TO DISSIPATE. SOME RAIN WILL REMAIN POSSIBLE INTO THE LATE EVENING HOURS...WITH TEMPERATURES DIPPING COOL ENOUGH TO CONVERT ANY PRESENT RAINFALL TO SNOWFALL BY THE EARLY MORNING HOURS. COOLER...MOIST AIR WILL REMAIN OVER THE FIRE ON TUESDAY...WITH WIND AGAIN INCREASING SLIGHTLY IN THE AFTERNOON. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...BRANHAM .TODAY... SKY/WEATHER.........CLOUDY (85-100 PERCENT). ISOLATED SHOWERS AND THUNDERSTORMS INITIATING BETWEEN 1400 AND 1500. MAX TEMPERATURE.....70-73. MIN HUMIDITY........17-20 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTH 10 TO 17 MPH WITH GUSTS TO AROUND 30 MPH BY 1100... THEN SHIFTING TO 20 TO 25 MPH WITH GUSTS TO AROUND 40 MPH BY 1400. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS. RIDGE TOP WINDS.....SOUTH 15 TO 20 MPH SHIFTING TO THE WEST AROUND 25 MPH BY 1300. LAL.................1 UNTIL 1400...THEN 2. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT) THEN BECOMING PARTLY CLOUDY (50-60 PERCENT) AFTER 0200. ISOLATED THUNDERSTORMS THROUGH 2100. ISOLATED RAIN SHOWERS THROUGH AROUND 0200...THEN DRY CONDITIONS EXPECTED. MIN TEMPERATURE.....30-33. MAX HUMIDITY........61-65 PERCENT. 20 FOOT WINDS.......NORTHWEST WINDS 8 TO 15 MPH SHIFTING TO THE NORTH BY 0100. GUSTS UP TO 25 MPH DECREASING TO 15 MPH BY 0400. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS. RIDGE TOP WINDS.....NORTH 18 TO 23 MPH. LAL.................2 UNTIL 2100...THEN 1. CHC OF WETTING RAIN.LESS THAN 5 PERCENT. HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .TUESDAY... SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). SLIGHT CHANCE OF SNOW BEGINNING BY 0600. A CONVERSION TO RAIN IS EXPECTED BY 1200...WHICH WILL CONTINUE THROUGH THE DAY. MAX TEMPERATURE.....40-44. MIN HUMIDITY........26-29 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING NORTHWEST 10 TO 15 MPH BY 1000. GUSTS UP TO 20 MPH. RIDGE TOP WINDS.....NORTH-NORTHWEST AROUND 15 MPH. LAL.................1. CHC OF WETTING RAIN.LESS THAN 5 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .FORECAST DAYS 3 THROUGH 5... .TUESDAY NIGHT...MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN AND SNOW IN THE EVENING. LOWS AROUND 30. NORTH WINDS AROUND 16 MPH. .WEDNESDAY...PARTLY CLOUDY. LOWS IN THE UPPER 20S. HIGHS IN THE MID 40S. WINDS GENERALLY LESS THAN 10 MPH. .THURSDAY...WARMER. MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH. .FRIDAY...PARTLY CLOUDY. LOWS IN THE UPPER 30S. HIGHS IN THE UPPER 60S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...BRANHAM REQUESTED BY...CATHY HUTTON REASON FOR REQUEST...WILDFIRE .TAG 20130429.BIGFO.01/RIW