FNUS75 KRIW 101233 FWSRIW SPOT FORECAST FOR WIGGINS RAT...USFS SHF NATIONAL WEATHER SERVICE RIVERTON WY 633 AM MDT TUE APR 10 2012 FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON APRIL 10. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...RIDGE OF HIGH PRESSURE MOVES OVERHEAD TODAY. WINDS ARE A TOUGH CALL TODAY WITH THE POTENTIAL FOR THE WINDS SHIFTING BETWEEN WEST NORTHWEST AND EAST SOUTHEAST. MOST LIKELY THE WINDS WILL BE WEST NORTHWEST WIND DURING THE MIDDLE PART OF THE DAY AND THEN SHIFTING TO THE EAST SOUTHEAST BETWEEN 1600-1700L FOR A FEW HOURS. ON WEDNESDAY... AN UPPER LEVEL DISTURBANCE WILL MOVE TOWARDS THE AREA LATE IN THE DAY RESULTING IN ISOLATED SHOWERS AND POTENTIAL A THUNDERSTORM IN THE AREA BY LATE AFTERNOON. THE CHANCE OF SHOWERS AND ISOLATED THUNDERSTORMS WILL INCREASE WEDNESDAY EVENING ALONG WITH THE POTENTIAL FOR STRONG WINDS AS THE SYSTEM PASSES OVERHEAD. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...SKRBAC .TODAY... SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT) THEN BECOMING PARTLY CLOUDY (40-50 PERCENT). MAX TEMPERATURE.....60-63. MIN HUMIDITY........13-16 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH...BECOMING WEST NORTHWEST AROUND 10 MPH WITH GUSTS 15-20 MPH IN THE EARLY AFTERNOON. RIDGE TOP WINDS.....SOUTHWEST 15-20 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1000-1600 FT AGL INCREASING TO 6000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST 8 TO 12 MPH. SMOKE DISPERSAL.....POOR (13000 KNOT-FT)...INCREASING TO FAIR IN THE AFTERNOON AND BRIEFLY GOOD (50000-60000 KNOT-FT). .TONIGHT... SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT). MIN TEMPERATURE.....29-32. MAX HUMIDITY........58-62 PERCENT. 20 FOOT WINDS.......SOUTHEAST 6-12 MPH UNTIL AROUND SUNSET...THEN DOWNSLOPE/DOWNVALLEY 4-7 MPH. RIDGE TOP WINDS.....SOUTHEAST 5 TO 10 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2100-3100 FT AGL DECREASING TO 600 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....SOUTHEAST 5 TO 10 MPH. SMOKE DISPERSAL.....POOR (4800-20000 KNOT-FT). .WEDNESDAY... SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT) THEN BECOMING PARTLY CLOUDY (35-45 PERCENT). ISOLATED SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.....61-64. MIN HUMIDITY........14-17 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHEAST AROUND 10 MPH WITH GUSTS OF 15-20 MPH IN THE AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTHEAST 5 TO 10 MPH...BECOMING SOUTH TO SOUTHEAST 10 TO 15 MPH AFTER 1500L. LAL.................1 UNTIL 1500...THEN 2. CHC OF WETTING RAIN.LESS THAN 5 PERCENT. HAINES INDEX........5 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1700-2700 FT AGL INCREASING TO 6500 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHEAST 6 TO 10 MPH...BECOMING SOUTH TO SOUTHEAST 9-15 MPH AFTER 1500L. SMOKE DISPERSAL.....POOR... BECOMING GOOD BY 1400L (20000-78000 KNOT-FT). .FORECAST DAYS 3 THROUGH 5... .WEDNESDAY NIGHT...MOSTLY CLOUDY. SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS IN THE EVENING...THEN SCATTERED SNOW SHOWERS AFTER MIDNIGHT. LOWS IN THE LOWER 30S. SOUTHWEST WINDS AROUND 10 MPH. .THURSDAY...COLDER. PARTLY CLOUDY. SCATTERED SHOWERS AND SNOW SHOWERS. LOWS IN THE MID 20S. HIGHS IN THE LOWER 40S. WEST WINDS AROUND 11 MPH. .FRIDAY...MOSTLY CLOUDY. CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE UPPER 20S. HIGHS IN THE LOWER 40S. WINDS GENERALLY LESS THAN 10 MPH. .SATURDAY...MOSTLY CLOUDY WITH CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN THE MID 20S. HIGHS AROUND 40. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...SKRBAC REQUESTED BY...SEAN SNYDER REASON FOR REQUEST...PRESCRIBED .TAG 20120410.WIGGI.02/RIW