FNUS75 KRIW 301018 FWSRIW SPOT FORECAST FOR CYGNET FIRE...NPS YNP NATIONAL WEATHER SERVICE RIVERTON WY 418 AM MDT THU AUG 30 2012 FORECAST IS BASED ON REQUEST TIME OF 2023 MDT ON AUGUST 29. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... MONSOONAL MOISTURE WILL GRADUALLY INCREASE ACROSS THE AREA... ESPECIALLY FRIDAY INTO SATURDAY LEADING TO AN INCREASING CHANCE OF SHOWERS AND SOME THUNDERSTORMS. TODAY STILL LOOKS DRY WITH GUSTY SOUTHWEST WINDS THIS AFTERNOON AND EVENING. ISOLATED SHOWERS AND THUNDERSTORMS THOUGH WILL NOT BE TOO FAR TO THE SOUTH WHERE THE MONSOONAL MOISTURE IS ALREADY MOVING IN. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...SKRBAC .TODAY... SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT) THEN BECOMING PARTLY CLOUDY (35-45 PERCENT). MAX TEMPERATURE.....71-74. MIN HUMIDITY........10-13 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHWEST 10 TO 13 MPH WITH GUSTS TO AROUND 20 MPH IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTHWEST 18 TO 22 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......4400-5400 FT AGL INCREASING TO 8500-9000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST 10 TO 15 MPH INCREASING TO 20 TO 25 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....GOOD (75000 KNOT-FT) INCREASING TO EXCELLENT (190000 KNOT-FT) IN THE AFTERNOON. .TONIGHT... SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT) BECOMING PARTLY CLOUDY (40-50 PERCENT) AFTER 0300L. MIN TEMPERATURE.....42-45. MAX HUMIDITY........64-68 PERCENT. 20 FOOT WINDS.......SOUTH WINDS 8 TO 12 MPH...BECOMING DOWNSLOPE/DOWNVALLEY AFTER 2100L. RIDGETOP WINDS......SOUTHWEST AROUND 20 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......4500-5000 FT AGL DECREASING TO 800-1200 AFTER MIDNIGHT. TRANSPORT WINDS.....SOUTHWEST 17 TO 23 MPH. SMOKE DISPERSAL.....VERY GOOD (125000 KNOT-FT) DECREASING TO POOR (22200 KNOT-FT) AFTER MIDNIGHT. .FRIDAY... SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT)...BECOMING MOSTLY CLOUDY (70-80 PERCENT) IN THE AFTERNOON. ISOLATED RAIN SHOWERS IN THE MORNING...THEN SCATTERED SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.....71-74. MIN HUMIDITY........23-26 PERCENT. 20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHWEST AROUND 10 TO 15 MPH EARLY IN THE AFTERNOON WITH GUSTS UP TO 20 MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON. RIDGE TOP WINDS.....SOUTHWEST 18 TO 23 MPH. LAL.................1 UNTIL 1200...THEN 3. CHC OF WETTING RAIN.10 PERCENT IN THE LATE AFTERNOON. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3500-4000 FT AGL INCREASING TO 7700-8200 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTHWEST 16 TO 21 MPH. SMOKE DISPERSAL.....GOOD (80000 KNOT-FT) INCREASING TO EXCELLENT IN THE AFTERNOON (160000 KNOT-FT). .FORECAST DAYS 3 THROUGH 5... .FRIDAY NIGHT...PARTLY CLOUDY. SCATTERED SHOWERS AND THUNDERSTORMS IN THE EVENING...THEN ISOLATED SHOWERS AFTER MIDNIGHT. LOWS IN THE UPPER 30S. WINDS GENERALLY LESS THAN 10 MPH. .SATURDAY...PARTLY CLOUDY. NUMEROUS SHOWERS AND THUNDERSTORMS... ESPECIALLY IN THE AFTERNOON. LOWS IN THE MID 30S. HIGHS AROUND 70. WINDS GENERALLY LESS THAN 10 MPH. .SUNDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE UPPER 60S. WINDS GENERALLY LESS THAN 10 MPH. .LABOR DAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE LOWER 70S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...SKRBAC REQUESTED BY...M HEANEY REASON FOR REQUEST...WILDFIRE .TAG 20120829.CYGNE.01/RIW