FNUS75 KRIW 082359 FWSRIW SPOT FORECAST FOR LAVA RX...USFS NATIONAL WEATHER SERVICE RIVERTON WY 559 PM MDT SUN APR 8 2012 FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON APRIL 09. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...DRY WEATHER IS FORECAST MONDAY AND TUESDAY. WIND SPEEDS WILL BE FAIRLY LIGHT THE NEXT TWO DAYS. AS THE TERRAIN HEATS UP EACH DAY...ONE WOULD EXPECT AN UPVALLEY OR UPSLOPE TO OCCUR BY LATE MORNING AND THIS BREEZE TO CONTINUE THROUGH LATE AFTERNOON. THE WIND WILL SUBSIDE ONCE EVENING OCCURS WITH A LIGHT DOWNSLOPE WIND OCCURRING AT NIGHT. LOW LEVEL INVERSION IS EXPECTED MONDAY NIGHT AND TUESDAY NIGHT DUE TO RADIATIONAL COOLING DUE TO A CLEAR SKY AND A FAIRLY DRY AIRMASS. THIS INVERSION SHOULD BREAK BY LATE MORNING DUE TO THE DAYTIME HEATING AND THEN SMOKE DISPERSAL IMPROVES TO THE GOOD CATEGORY EACH AFTERNOON UNTIL ABOUT SUNSET. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...AR .TODAY (MONDAY)... SKY/WEATHER.........MOSTLY SUNNY. MAX TEMPERATURE.....60-65. MIN HUMIDITY........12-17 PERCENT. 20 FOOT WINDS.......VARIABLE AT 3 TO 6 MPH UNTIL 1200. THEN SOUTHWEST TO WEST AT 6 TO 10 MPH WITH GUSTS TO 13 MPH AFTER 1200. RIDGE TOP WINDS.....VARIABLE AT 4 TO 7 MPH UNTIL 1200. THEN SOUTHWEST TO WEST AT 7 TO 11 MPH WITH GUSTS TO 15 MPH AFTER 1200. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......INCREASING TO 5000-5500 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....BECOMING SOUTHWEST AT 10 TO 15 MPH AFTER 1200. SMOKE DISPERSAL.....POOR...BECOMING FAIR AFTER 1100...BECOMING GOOD AFTER 1430. .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY. MIN TEMPERATURE.....24-29. MAX HUMIDITY........65-70 PERCENT. 20 FOOT WINDS.......WEST TO SOUTHWEST AT 6 TO 9 MPH WITH GUSTS TO 12 MPH UNTIL 1900. THEN WEST TO SOUTHWEST AT 4 TO 7 MPH AFTER 1900 UNTIL 2300. THEN DOWNSLOPE/DOWNVALLEY AT 3 TO 6 MPH MPH AFTER 2300. RIDGE TOP WINDS.....WEST TO SOUTHWEST AT 7 TO 11 MPH WITH GUSTS TO 15 MPH UNTIL 1900. THEN WEST TO SOUTHWEST AT 5 TO 9 MPH AFTER 1900 UNTIL 2300. THEN SOUTHWEST AT 4 TO 7 MPH AFTER 2300. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......DECREASING TO UNDER 1000 FT AGL AFTER MIDNIGHT. TRANSPORT WINDS.....SOUTHWEST 10 TO 15 MPH UNTIL 1900. THEN SOUTH TO SOUTHWEST AT 5 TO 10 MPH BY 2000 AND OVERNIGHT. SMOKE DISPERSAL.....GOOD UNTIL SUNSET...THEN FAIR...BECOMING POOR AROUND MIDNIGHT. .TUESDAY... SKY/WEATHER.........MOSTLY SUNNY. MAX TEMPERATURE.....62-67. MIN HUMIDITY........13-18 PERCENT. 20 FOOT WINDS.......VARIABLE AT 3 TO 6 MPH UNTIL 1200. THEN SOUTHWEST TO WEST AT 6 TO 10 MPH WITH GUSTS TO 13 MPH AFTER 1200. RIDGE TOP WINDS.....VARIABLE AT 4 TO 7 MPH UNTIL 1200. THEN SOUTHWEST TO WEST AT 7 TO 11 MPH WITH GUSTS TO 15 MPH AFTER 1200. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......INCREASING TO 5500-6000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTH TO SOUTHWEST AT 5 TO 10 MPH BY 1200. SOUTH TO SOUTHWEST AT AROUND 15 MPH AFTER 1200. SMOKE DISPERSAL.....POOR...BECOMING FAIR AFTER 1100...BECOMING GOOD AFTER 1430. .FORECAST DAYS 3 THROUGH 5... .TUESDAY NIGHT...PARTLY CLOUDY. LOWS IN THE LOWER 30S. WINDS GENERALLY LESS THAN 10 MPH AFTER SUNSET. .WEDNESDAY...PARTLY CLOUDY. CHANCE OF SHOWERS AND SNOW SHOWERS. HIGHS AROUND 60. WEST TO SOUTHWEST AT 7 TO 12 MPH WITH GUSTS AROUND 15 MPH IN THE AFTERNOON UNTIL SUNSET. .THURSDAY...MOSTLY CLOUDY. CHANCE OF RAIN AND SNOW SHOWERS. SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS. LOWS IN THE MID 20S. HIGHS IN THE MID 40S. WEST AT 10 TO 15 MPH. .FRIDAY...PARTLY CLOUDY WITH CHANCE OF RAIN OR SNOW SHOWERS. LOWS IN THE MID 20S. HIGHS IN THE MID 40S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...ROSS REQUESTED BY...JASON LAWHON REASON FOR REQUEST...PRESCRIBED .TAG 20120408.LAVAR.01/RIW