FNUS75 KRIW 231335
FWSRIW

SPOT FORECAST FOR OLD FAITHFUL SP EVENT...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
735 AM MDT MON AUG 23 2010

FORECAST IS BASED ON IGNITION TIME OF 0720 MDT ON AUGUST 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

POST TROUGH CONDITIONS EXIST TODAY WITH SOME LOW TO MID CLOUDS
LINGERING AROUND OLD FAITHFUL TODAY...DECREASING SLOWLY AS THE
AFTERNOON PROGRESSES. AN ISOLATED SHOWER CANT BE RULED OUT THIS
MORNING. TUESDAY AND WEDNESDAY EACH LOOK LIKE NICE DAYS WITH
RELATIVELY LIGHT WINDS AND WARMING TEMPERATURES.


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

FORECASTER...T.BAKER

.TODAY...
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). ISOLATED RAIN
                    SHOWERS IN THE MORNING.
MAX TEMPERATURE.....60-63.
MIN HUMIDITY........30-35 PERCENT.
20 FOOT WINDS.......VARIABLE 1-4 MPH...BECOMING WEST 4-8 MPH GUSTS TO 15 MPH
                    AROUND 1100.
RIDGE TOP WINDS.....WEST 7 TO 12 MPH GUSTS TO AROUND 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.3 PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......500 FT AGL INCREASING TO 5000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 15 MPH.
SMOKE DISPERSAL.....POOR (7500 KNOT-FT) INCREASING TO GOOD
                    (75000 KNOT-FT) IN THE AFTERNOON.

.TUESDAY...
SKY/WEATHER.........SUNNY (0-10 PERCENT).
MAX TEMPERATURE.....70-75.
MIN HUMIDITY........20-25 PERCENT.
20 FOOT WINDS.......VARIABLE 1-4 MPH...BECOMING UP VALLEY 4-8 MPH AROUND
                    NOON.
RIDGE TOP WINDS.....SOUTHWEST TO WEST 5 TO 10 MPH GUSTS TO 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......1000 FT AGL INCREASING TO 6000 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST TO WEST 10 MPH.
SMOKE DISPERSAL.....POOR (10000 KNOT-FT) GOOD (60000 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...CLEAR. LOWS IN THE MID 30S. WINDS GENERALLY LESS
THAN 10 MPH.
.WEDNESDAY...CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE UPPER
70S. SOUTHWEST WINDS AROUND 10 MPH GUSTS TO 15 MPH.
.THURSDAY...MOSTLY CLEAR. ISOLATED SHOWERS AND THUNDERSTORMS.
LOWS IN THE LOWER 40S. HIGHS IN THE UPPER 70S. WINDS GENERALLY
LESS THAN 10 MPH.
.FRIDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE UPPER 30S. HIGHS IN THE LOWER 70S.
WINDS GENERALLY LESS THAN 10 MPH.

$$

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