FNUS75 KRIW 232016
FWSRIW

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

FORECAST IS BASED ON REQUEST TIME OF 1352 MDT ON AUGUST 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
THE SKY CLEARS THIS EVENING ALLOWING FOR GOOD RADIATIONAL COOLING...WITH
OVERNIGHT LOWS DROPPING INTO THE LOW 30S...POSSIBLY INTO THE UPPER
20S. TUESDAY AND WEDNESDAY WILL BE SUNNY WITH WARMER TEMPERATURES
AND LOWER RH'S. WINDS WILL BE RELATIVELY LIGHT. WINDS WILL BE ON
THE INCREASE AS WELL ON THURSDAY WITH VERY DRY AND WARM
CONDITIONS. THUNDERSTORMS RETURN TO THE FORECAST ON FRIDAY.


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

FORECASTER...T.BAKER

.TONIGHT...
SKY/WEATHER.........DECREASING CLOUDS.  BECOMING CLEAR BY 2200 (0-10 PERCENT).
MIN TEMPERATURE.....30-35.
MAX HUMIDITY........70-75 PERCENT.
20 FOOT WINDS.......WEST WINDS 4 TO 8 MPH. GUSTS UP TO 15 MPH.
                    BECOMING VARIABLE 3 TO 6 MPH AROUND 2200.
RIDGE TOP WINDS.....SOUTHWEST TO WEST 10 TO 15 GUSTS TO 20 MPH...DECREASING TO
                    5 TO 10 MPH AROUND 2200.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4000 FT AGL DECREASING TO 500 FT AGL AROUND 2200.
TRANSPORT WINDS.....WEST 10 MPH.
SMOKE DISPERSAL.....FAIR (40000 KNOT-FT) DECREASING TO POOR
                    (5000 KNOT-FT) AFTER 2100.

.TUESDAY...
SKY/WEATHER.........SUNNY (0-10 PERCENT).
MAX TEMPERATURE.....65-68.
MIN HUMIDITY........18-22 PERCENT.
20 FOOT WINDS.......VARIABLE 2 TO 4 MPH...BECOMING UPSLOPE/UPVALLEY 5-9 MPH
                    GUSTS TO 15 MPH AROUND 1100.
RIDGE TOP WINDS.....WEST 5 TO 10 MPH GUSTS TO 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......500 FT AGL INCREASING TO 6000 FT AGL
                    AROUND 1100.
TRANSPORT WINDS.....WEST 10 MPH.
SMOKE DISPERSAL.....POOR (5000 KNOT-FT) INCREASING TO GOOD
                    (60000 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...CLEAR. LOWS IN THE LOWER 40S. MIN RH: 45-50 PERCENT.
WINDS GENERALLY LESS THAN 10 MPH.
.WEDNESDAY...CLEAR. LOWS IN THE UPPER 40S. HIGHS IN THE LOWER
70S. SOUTHWEST WINDS AROUND 10 MPH.
.THURSDAY...MOSTLY CLEAR. LOWS IN THE UPPER 40S. HIGHS IN THE
LOWER 70S. SOUTHWEST WINDS AROUND 10 MPH.
.FRIDAY...COOLER. PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE LOWER 40S. HIGHS IN THE LOWER 60S.
WINDS GENERALLY LESS THAN 10 MPH.
.SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE LOWER 40S. HIGHS IN THE MID 60S. WINDS
GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...T.BAKER
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20100823.ARTHU.01/RIW