FNUS75 KRIW 121639 FWSRIW SPOT FORECAST FOR NORTH FORK PILES...USFS SHF NATIONAL WEATHER SERVICE RIVERTON WY 1039 AM MDT WED MAY 12 2010 FORECAST IS BASED ON IGNITION TIME OF 1200 MDT ON MAY 12. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .DISCUSSION... A STRONG LOW PRESSURE SYSTEM CONTINUES ITS EASTWARD TREK INTO THE PLAINS STATES. NORTH TO NORTHEAST FLOW BEHIND THIS SYSTEM WILL BRING CONTINUED LIGHT SNOWFALL THROUGHOUT TODAY IN THE BURN AREA. A WEAKER LOW PRESSURE SYSTEM...DEVELOPING TO THE SOUTHWEST...WILL ALLOW FOR A SLIGHT CHANCE OF PRECIPITATION THROUGH THURSDAY. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...BERC .TODAY... SKY/WEATHER.........CLOUDY (95-100 PERCENT). LIGHT TO MODERATE SNOW IN THE MORNING...THEN LIGHT SNOW WITH A CHANCE OF RAIN/SNOW MIX IN THE AFTERNOON. MAX TEMPERATURE.....39-43. MIN HUMIDITY........56-59 PERCENT. WIND (20 FT)........UPSLOPE/UPVALLEY 5-9 MPH BECOMING EAST 10 TO 11 MPH WITH HIGHER GUSTS IN THE LATE MORNING AND EARLY AFTERNOON...THEN BECOMING UPSLOPE/UPVALLEY 5-9 MPH LATE IN THE AFTERNOON. RIDGE TOP WINDS.....EAST 15 TO 20 MPH. LAL.................1. CWR.................34 PERCENT. HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2400-3400 FT AGL. TRANSPORT WINDS.....EAST 14 TO 20 MPH. SMOKE DISPERSAL.....POOR TO FAIR (37400-50900 KNOT-FT). .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING PARTLY CLOUDY (50-60 PERCENT). SCATTERED SNOW SHOWERS IN THE EVENING...THEN ISOLATED SNOW SHOWERS AFTER MIDNIGHT. MIN TEMPERATURE.....23-26. MAX HUMIDITY........89-92 PERCENT. WIND (20 FT)........EAST WINDS AROUND 8 MPH WITH GUSTS TO AROUND 15 MPH EARLY IN THE EVENING BECOMING DOWNSLOPE/DOWNVALLEY 4-7 MPH. RIDGE TOP WINDS.....EAST 10 TO 15 MPH SHIFTING TO THE SOUTHEAST AROUND 5 MPH AFTER MIDNIGHT...THEN SHIFTING TO THE WEST EARLY IN THE MORNING. LAL.................1. CWR.................4 PERCENT. HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1800-2800 FT AGL. TRANSPORT WINDS.....EAST 10 TO 16 MPH SHIFTING TO THE SOUTHWEST 8 TO 9 MPH AFTER MIDNIGHT. SMOKE DISPERSAL.....POOR (10600-33900 KNOT-FT). .THURSDAY... SKY/WEATHER.........PARTLY CLOUDY (55-65 PERCENT). ISOLATED SNOW SHOWERS IN THE MORNING...THEN ISOLATED RAIN SHOWERS IN THE AFTERNOON. MAX TEMPERATURE.....48-52. MIN HUMIDITY........45-53 PERCENT. WIND (20 FT)........UPSLOPE/UPVALLEY 5-9 MPH. RIDGE TOP WINDS.....SOUTHWEST AROUND 10 MPH SHIFTING TO THE SOUTHEAST IN THE AFTERNOON. LAL.................1. CWR.................4 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1600-2600 FT AGL INCREASING TO 4100-5100 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....WEST AROUND 9 MPH SHIFTING TO THE SOUTHEAST 9 TO 12 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....POOR (11200-34800 KNOT-FT). .FORECAST DAYS 3 THROUGH 5... .THURSDAY NIGHT...PARTLY CLOUDY. SCATTERED SHOWERS IN THE EVENING. LOWS IN THE UPPER 20S. WINDS GENERALLY LESS THAN 10 MPH. .FRIDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH. .SATURDAY...PARTLY CLOUDY. LOWS IN THE LOWER 30S. HIGHS IN THE LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH. .SUNDAY...PARTLY CLOUDY. LOWS IN THE UPPER 30S. HIGHS IN THE MID 60S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...BERC REQUESTED BY...CLINT DAWSON REASON FOR REQUEST...PRESCRIBED .TAG 20100512.NORTH.01/RIW