FNUS75 KRIW 011741
FWSRIW

SPOT FORECAST FOR VAIL FIRE...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
1141 AM MDT THU SEP 1 2011

FORECAST IS BASED ON IGNITION TIME OF 1125 MDT ON SEPTEMBER 01.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...AN APPROACHING TROUGH WILL BRING GUSTY WINDS TO THE AREA
ALONG WITH LOW RH'S.  HIGH FIRE WEATHER DANGER RESULTS. COLDER AIR
MOVES IN TONIGHT BEHIND THE TROUGH. WINDS RETURN FRIDAY AS ANOTHER SYSTEM
MOVES THROUGH...SO WILL SEE THE HIGH FIRE WEATHER DANGER RETURN.
WINDS TAPER SOME FOR SATURDAY...REMAINING DRY.

...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS...
...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT...

FORECASTER...LIPSON

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).
MIN TEMPERATURE.....36-39.
MAX HUMIDITY........55-63 PERCENT.
20 FOOT WINDS.......WEST WINDS AROUND 14 MPH WITH GUSTS TO AROUND
                    25 MPH EARLY IN THE EVENING BECOMING NORTHEASTERLY
                    DOWNSLOPE/DOWNVALLEY 4-7 MPH.
RIDGE TOP WINDS.....WEST AROUND 25 MPH DECREASING TO AROUND 15 MPH
                    LATE IN THE EVENING...THEN SHIFTING TO THE
                    SOUTH AFTER MIDNIGHT.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.

.FRIDAY...
SKY/WEATHER.........SUNNY (0-10 PERCENT).
MAX TEMPERATURE.....60-63.
MIN HUMIDITY........18 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING WEST 11 TO 13
                    MPH WITH GUSTS TO AROUND 25 MPH IN THE
                    AFTERNOON BY 1200.
RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...CLEAR. LOWS AROUND 40. WINDS GENERALLY LESS THAN
10 MPH.
.SATURDAY...CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE MID 60S.
WINDS GENERALLY LESS THAN 10 MPH.
.SUNDAY...MOSTLY CLEAR. LOWS IN THE UPPER 40S. HIGHS IN THE UPPER
60S. WINDS GENERALLY LESS THAN 10 MPH.
.LABOR DAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 40S. HIGHS IN THE MID 60S. WINDS
GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...LIPSON
REQUESTED BY...VAIL IC
REASON FOR REQUEST...PRESCRIBED
.TAG 20110901.VAILF.01/RIW