FNUS75 KRIW 061854 FWSRIW SPOT FORECAST FOR POINT...NPS YNP NATIONAL WEATHER SERVICE RIVERTON WY 1254 PM MDT TUE SEP 6 2011 FORECAST IS BASED ON REQUEST TIME OF 1204 MDT ON SEPTEMBER 06. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... LOW PRESSURE OVER CENTRAL WYOMING WILL HAVE ENOUGH MOISTURE ASSOCIATED WITH IT TO INITIATE ISOLATED SHOWERS AND THUNDERSTORMS THIS AFTERNOON. THIS LOW PRESSURE SYSTEM WILL DRIFT FARTHER SOUTH ON WEDNESDAY WHICH SHOULD LIMIT THE CHANCE OF LIGHT SHOWERS WEDNESDAY AFTERNOON. A DRYING TREND WILL CONTINUE THURSDAY AND INTO THE WEEKEND AS HIGH PRESSURE NOSES IN FROM THE NORTH. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...JONES .THIS AFTERNOON... SKY/WEATHER.........BECOMING PARTLY CLOUDY (50-60 PERCENT) BY 1400 WITH ISOLATED SHOWERS AND THUNDERSTORMS. MAX TEMPERATURE.....66-69. MIN HUMIDITY........26-29 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5 TO 9 MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS. RIDGE TOP WINDS.....EAST-NORTHEAST 5 TO 9 MPH. LAL.................1 UNTIL 1400...THEN LAL 2. CHC OF WETTING RAIN.LESS THAN 5 PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......INCREASING TO AROUND 5000 FT AGL BY 1500. TRANSPORT WINDS.....EAST-NORTHEAST AROUND 10 MPH. SMOKE DISPERSAL.....BECOMING FAIR BY 1500. .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY (50 PERCENT) WITH ISOLATED SHOWERS AND THUNDERSTORMS UNTIL 1930... THEN PARTLY CLOUDY (30-40 PERCENT). MIN TEMPERATURE.....32-35. MAX HUMIDITY........82-85 PERCENT. 20 FOOT WINDS.......BECOMING DOWNSLOPE/DOWNVALLEY 4 TO 7 MPH BY 2030. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS. RIDGE TOP WINDS.....EAST 10 TO 15 MPH. LAL.................2 UNTIL 1930...THEN LAL 1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3500 FT AGL UNTIL 1900...THEN DECREASING TO LESS THAN 1000 FT AGL BY 2200. TRANSPORT WINDS.....EAST-NORTHEAST AROUND 10 MPH UNTIL 2000... THEN BECOMING DOWNSLOPE/DOWNVALLEY 5 TO 9 MPH. SMOKE DISPERSAL.....POOR. .WEDNESDAY... SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT) UNTIL 1200...THEN BECOMING PARTLY CLOUDY (40-50 PERCENT) BY 1400. MAX TEMPERATURE.....68-71. MIN HUMIDITY........22-25 PERCENT. 20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4 TO 7 MPH UNTIL 1000... THEN BECOMING UPSLOPE/UPVALLEY 5 TO 9 MPH BY 1400. RIDGE TOP WINDS.....EAST 5 TO 10 MPH UNTIL 1300...THEN SHIFTING TO THE SOUTHEAST. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......LESS THAN 1000 FT AGL UNTIL 0900...THEN GRADUALLY INCREASING TO NEAR 4000 FT AGL BY 1400. TRANSPORT WINDS.....DOWNSLOPE/DOWNVALLEY 5 TO 9 MPH UNTIL 1000... THEN BECOMING SOUTHEAST AROUND 10 MPH BY 1400. SMOKE DISPERSAL.....POOR UNTIL 1200...THEN INCREASING TO FAIR BY 1400. .FORECAST DAYS 3 THROUGH 5... .WEDNESDAY NIGHT...MOSTLY CLEAR. LOWS IN THE MID 30S. WIND GENERALLY LESS THAN 10 MPH. .THURSDAY...PARTLY CLOUDY WITH A SLIGHT CHANCE OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS AROUND 70. WIND GENERALLY LESS THAN 10 MPH. .FRIDAY...MOSTLY CLEAR. LOWS IN THE LOWER 30S. HIGHS IN THE UPPER 60S. WIND GENERALLY LESS THAN 10 MPH. .SATURDAY...MOSTLY CLEAR. LOWS IN THE LOWER 30S. HIGHS AROUND 70. WIND GENERALLY LESS THAN 10 MPH. $$ FORECASTER...JONES REQUESTED BY...POINT FIRE OPS REASON FOR REQUEST...WILDFIRE .TAG 20110906.POINT.01/RIW