FNUS75 KRIW 231110
FWSRIW

SPOT FORECAST FOR ARTHUR 2...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
510 AM MDT MON AUG 23 2010

FORECAST IS BASED ON REQUEST TIME OF 2152 MDT ON AUGUST 22.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL
WEATHER SERVICE.

.DISCUSSION...SOME SHOWERS AND LOW CLOUDS WILL LIKELY LINGER OVER
THE AREA BEHIND LAST NIGHT'S TROUGH/FRONTAL PASSAGE.  THE AIRMASS
WILL DRY OUT AND STABILIZE THROUGH THE AFTERNOON.  SURFACE HIGH
PRESSURE WILL BUILD OVER THE AREA MONDAY NIGHT WITH NEAR FREEZING
TEMPERATURES LIKELY TUESDAY MORNING.

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

FORECASTER...MEUNIER

.TODAY...
SKY/WEATHER.........MOSTLY CLOUDY THROUGH NOON. LOW CLOUDS
                    AND FOG POSSIBLE. ISOLATED RAIN SHOWERS
                    THIS MORNING. DECREASING CLOUDS THIS AFTERNOON.
MAX TEMPERATURE.....60-65.
MIN HUMIDITY........28-33 PERCENT.
20 FOOT WINDS.......WEST TO 4 TO 8 MPH GUSTS TO 15 MPH.
RIDGE TOP WINDS.....WEST 10 TO 15 MPH GUSTS TO AROUND 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.5 PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1000 FT AGL INCREASING TO 5000 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 15 MPH.
SMOKE DISPERSAL.....POOR (15000 KNOT-FT) INCREASING TO GOOD
                    (75000 KNOT-FT) IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....30-33.
MAX HUMIDITY........85-90 PERCENT.
20 FOOT WINDS.......WEST WINDS 8 TO 13 MPH WITH GUSTS TO 20 MPH
                    UNTIL AROUND SUNSET. BECOMING NORTHEAST TO EAST 5-9 MPH
                    AT DUSK.
RIDGE TOP WINDS.....WEST TO NORTHWEST 8 TO 13 MPH BECOMING NORTH NORTHEAST
                    5 TO 10 MPH AROUND MIDNIGHT.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4800-5800 FT AGL DECREASING TO 1600-2600 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....WEST NORTHWEST 10 TO 15 MPH...BECOMING NORTHEAST
                    5-9 MPH AROUND MIDNIGHT.
SMOKE DISPERSAL.....VERY GOOD (100300 KNOT-FT) DECREASING TO POOR
                    (30400 KNOT-FT) AFTER MIDNIGHT.

.TUESDAY...
SKY/WEATHER.........SUNNY (0-10 PERCENT).
MAX TEMPERATURE.....71-74.
MIN HUMIDITY........17-22 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY OR EAST 5-9 MPH IN THE MORNING.
                    BECOMING WEST SOUTHWEST 5-9 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTH AROUND 10 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......2500-3500 FT AGL INCREASING TO 5700-6700 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 15 MPH.
SMOKE DISPERSAL.....POOR TO GOOD (35400-72000 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...

.TUESDAY NIGHT...CLEAR. LOWS IN THE MID 30S. WINDS GENERALLY LESS
THAN 10 MPH.

.WEDNESDAY...CLEAR. HIGHS IN THE UPPER 70S.
WINDS GENERALLY LESS THAN 10 MPH.

.THURSDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 30S. HIGHS IN THE UPPER 70S.
WINDS GENERALLY LESS THAN 10 MPH.

.FRIDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 30S. HIGHS AROUND 70.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...ED FOLTS
REASON FOR REQUEST...WILDFIRE
.TAG 20100822.ARTHU.03/RIW