FNUS75 KRIW 220141
FWSRIW

SPOT FORECAST FOR GRAVEL...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
741 PM MDT SAT AUG 21 2010

FORECAST IS BASED ON REQUEST TIME OF 1847 MDT ON AUGUST 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...WINDS WILL DIMINISH AND BECOME DOWNSLOPE/DOWN CANYON WITH
SUNSET TONIGHT. CLOUDS WILL CONTINUE TO INCREASE WITH ISOLATED
SHOWERS AND THUNDERSTORMS THROUGH THE NIGHT.

SHOWERS AND THUNDERSTORMS WILL BECOME MORE NUMEROUS LATE SUNDAY
MORNING WITH A STRONG COLD FRONT EXPECTED TO PUSH THROUGH BETWEEN
1500 AND 1800 SUNDAY AFTERNOON. SOUTH SOUTHWEST WIND WILL INCREASE
AHEAD OF THE FRONT WITH WINDS BECOMING MORE ERRATIC AFTER 1500
WITH GOOD THUNDERSTORM COVERAGE...THROUGH 2100 SUNDAY EVENING.
CLOUDS AND SHOWERS WILL RESULT IN COOLER TEMPERATURES AND HIGHER
RELATIVE HUMIDITY ALONG WITH A GOOD CHANCE OF WETTING RAIN BY
SUNDAY EVENING (0.10 TO 0.25 OF AN INCH). RAPID DRYING ALONG WITH
DIMINISHING WIND AND MUCH COOLER TEMPERATURES WILL FOLLOW THE FRONT
EARLY MONDAY MORNING.

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

FORECASTER...MEUNIER

.REST OF TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). ISOLATED SHOWERS AND
                    THUNDERSTORMS OVERNIGHT.
MIN TEMPERATURE.....51-54.
MAX HUMIDITY........55-58 PERCENT.
20 FOOT WINDS.......SOUTH SOUTHWEST 5 TO 10 MPH WITH GUSTS NEAR 20 MPH
                    UNTIL 2100...THEN BECOMING EAST SOUTHEAST 7 TO 12 MPH.
RIDGE TOP WINDS.....SOUTH SOUTHWEST 20 TO 25 MPH.
LAL.................2.
CHC OF WETTING RAIN.3 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......6700-7700 FT AGL DECREASING TO 2300-3300 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....SOUTH SOUTHWEST AROUND 25 MPH.
SMOKE DISPERSAL.....VERY GOOD (111300 KNOT-FT) DECREASING TO FAIR
                    (50300 KNOT-FT) AFTER MIDNIGHT.

.SUNDAY...
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT).  BECOMING CLOUDY
                    AFTER 1500.  ISOLATED SHOWERS AND THUNDERSTORMS
                    BECOMING SCATTERED BY AFTERNOON...WITH NUMEROUS SHOWERS
                    AND THUNDERSTORMS AFTER 1500.
MAX TEMPERATURE.....67-70.
MIN HUMIDITY........35-40 PERCENT.
20 FOOT WINDS.......BECOMING SOUTH SOUTHWEST 10 TO 15 MPH WITH GUSTS TO 25
                    MPH BETWEEN 0900 AND NOON. GUSTY AND ERRATIC WINDS EXPECTED
                    NEAR THUNDERSTORMS WITH THESE ERRATIC WINDS LIKELY DOMINATING
                    AFTER 1500.
RIDGE TOP WINDS.....SOUTHWEST 20 TO 25 MPH.
LAL.................2 UNTIL 1200...THEN 4.
CHC OF WETTING RAIN.40 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3800-4800 FT AGL INCREASING TO 6500-7500 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 21 TO 26 MPH.
SMOKE DISPERSAL.....GOOD (85900 KNOT-FT) INCREASING TO VERY GOOD
                    (142300 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SUNDAY NIGHT...COLDER. MOSTLY CLOUDY IN THE EVENING THEN CLEARING.
NUMEROUS SHOWERS AND THUNDERSTORMS IN THE EVENING...THEN ISOLATED SHOWERS AND
THUNDERSTORMS UNTIL AROUND 0200. LOWS IN THE UPPER 30S. SOUTH
WEST WIND 8 TO 13 MPH WITH GUSTS TO 20 MPH IN THE EVENING WITH
WINDS DIMINISHING AFTER MIDNIGHT.
.MONDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE LOWER
60S. WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE LOWER 70S.
WINDS GENERALLY LESS THAN 10 MPH.
.WEDNESDAY...MOSTLY CLEAR. SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS AROUND 40. HIGHS IN THE MID 70S. WINDS
GENERALLY LESS THAN 10 MPH.
.THURSDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE LOWER 40S. HIGHS IN THE MID 70S. WINDS
GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...CHRIS VERO
REASON FOR REQUEST...WILDFIRE
.TAG 20100821.GRAVE.01/RIW