FNUS75 KRIW 231117 FWSRIW SPOT FORECAST FOR COAL FIRE...USFS BTF NATIONAL WEATHER SERVICE RIVERTON WY 517 AM MDT FRI JUL 23 2010 FORECAST IS BASED ON REQUEST TIME OF 1925 MDT ON JULY 22. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...DRY WEATHER WILL OCCUR THROUGH SATURDAY NIGHT AT THE FIRE SITE. IT WILL BE BREEZY THIS AFTERNOON AND EARLY EVENING. A WIND SHIFT TO THE EAST WILL OCCUR BETWEEN MIDNIGHT AND 3 AM SATURDAY MORNING AS A BACKDOOR FRONT ATTEMPTS TO PUSH THROUGH THE FIRE LOCATION. THE FRONT WOULD INCREASE RELATIVE HUMIDITY EARLY SATURDAY MORNING. THE AIRMASS WILL MIX OUT BY NOON SATURDAY WITH THE DRIER AIR RETURNING ALONG WITH A LIGHT SOUTH TO SOUTHWEST AFTERNOON WIND. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...AR .TODAY... SKY/WEATHER.........SUNNY. MAX TEMPERATURE.....70 TO 75. MIN HUMIDITY........15 TO 20 PERCENT. WIND (20 FT)........UPSLOPE/UPVALLEY 4-8 MPH UNTIL 11 AM...EXCEPT WEST 6-10 MPH WITH GUSTS TO 18 MPH OVER THE RIDGES...THEN A WEST WIND 15 TO 20 MPH WITH GUSTS TO 30 MPH BY 1 PM AND THROUGH THE REST OF THE AFTERNOON. RIDGE TOP WINDS.....WEST AT 10 TO 15 MPH UNTIL 11 AM. THEN A WEST WIND OF 20 TO 25 MPH WITH GUSTS TO 35 MPH BY 1 PM AND THROUGH THE REST OF THE AFTERNOON. LAL.................1. CWR.................ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......INCREASING TO 5500 TO 6000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....WEST AT 15 MPH UNTIL NOON...THEN WEST AT 25 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....INCREASING TO GOOD BY NOON...THEN VERY GOOD BY 2 PM. .TONIGHT... SKY/WEATHER.........CLEAR. MIN TEMPERATURE.....46-51. MAX HUMIDITY........65 TO 70 PERCENT. WIND (20 FT)........WEST WIND AT 10 TO 15 MPH WITH GUSTS TO 25 MPH UNTIL 8 PM...THEN WEST AT 6 TO 10 MPH...WIND BECOMING EAST AT 4 TO 8 MPH AFTER 1 AM. RIDGE TOP WINDS.....WEST WIND AT 15 TO 20 MPH WITH GUSTS TO 30 MPH UNTIL 8 PM...THEN WEST AT 10 TO 15 MPH...WIND BECOMING EAST AT 8 TO 16 MPH AFTER 1AM. LAL.................1. CWR.................ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......5000 FT AGL UNTIL SUNSET...THEN DECREASING TO 1000 AGL AFTER MIDNIGHT. TRANSPORT WINDS.....WEST AT 20 MPH UNTIL SUNSET...DECREASING TO 10 MPH BY MIDNIGHT...WIND BECOMING EAST AT 10 MPH AFTER 1 AM. SMOKE DISPERSAL.....GOOD DECREASING TO POOR BY MIDNIGHT. .SATURDAY... SKY/WEATHER.........MOSTLY SUNNY. MAX TEMPERATURE.....72-77. MIN HUMIDITY........17-22 PERCENT. WIND (20 FT)........VARIABLE AT 3 TO 5 MPH UNTIL NOON. THEN WEST TO SOUTHWEST AT 5 TO 10 MPH FOR THE AFTERNOON. RIDGE TOP WINDS.....SOUTH AT 5 MPH UNTIL NOON. THEN WEST 8 TO 13 MPH IN THE AFTERNOON. LAL.................1. CWR.................ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......INCREASING TO 6000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....SOUTH AT 5 TO 10 MPH UNTIL NOON. THEN WEST AT 10 TO 15 MPH IN THE AFTERNOON. SMOKE DISPERSAL.....POOR IN THE MORNING...INCREASING TO GOOD IN THE AFTERNOON. .FORECAST DAYS 3 THROUGH 5... .SATURDAY NIGHT...CLEAR. LOWS AROUND 50. WINDS GENERALLY LESS THAN 10 MPH. .SUNDAY...MOSTLY CLEAR. LOWS IN THE LOWER 50S. HIGHS IN THE MID 70S. NORTHWEST WINDS AROUND 10 MPH. .MONDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS IN THE LOWER 50S. HIGHS IN THE MID 70S. WINDS GENERALLY LESS THAN 10 MPH. .TUESDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS IN THE LOWER 50S. HIGHS AROUND 70. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...ROSS REQUESTED BY...BROWN REASON FOR REQUEST...WILDFIRE .TAG 20100722.COALF.01/RIW