FNUS75 KRIW 201918
FWSRIW

SPOT FORECAST FOR ANTELOPE FIRE...YELLOWSTONE NP/DOI
NATIONAL WEATHER SERVICE RIVERTON WY
118 PM MDT MON SEP 20 2010

FORECAST IS BASED ON REQUEST TIME OF 1248 MDT ON SEPTEMBER 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A WEAK UPPER LEVEL DISTURBANCE WILL MOVE EAST OF THE REGION LATER
TODAY...MAKING WAY FOR GUSTY WEST WINDS THROUGH TUESDAY. SURFACE WINDS
COULD TURN NORTHWEST BEFORE DECREASING LATER THIS EVENING. OTHERWISE...
WEST WINDS OF 15 TO 25 MPH WILL BE COMMON BY TUESDAY AFTERNOON...RESULTING
IN LOWER RELATIVE HUMIDITIES ONCE AGAIN. WINDS AT SURFACE AND ALOFT WILL
BECOME MORE SOUTHWESTERLY TUESDAY NIGHT INTO WEDNESDAY.

OTHERWISE...A PARTLY CLOUDY SKY WILL BECOME CLEAR LATER THIS EVENING.
ISOLATED SHOWERS ARE POSSIBLE UNTIL SUNSET.


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

FORECASTER...LYNOTT

.REST OF TODAY...
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). ISOLATED SHOWERS.
MAX TEMPERATURE.....58-62.
MIN HUMIDITY........32-36 PERCENT.
20 FOOT WINDS.......WEST WINDS AROUND 17 MPH WITH GUSTS TO
                    NEAR 30 MPH.
RIDGE TOP WINDS.....WEST 15 TO 25 MPH.
LAL.................3.
CHC OF WETTING RAIN.28 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......7400-8400 FT AGL.
TRANSPORT WINDS.....WEST 20 TO 21 MPH.
SMOKE DISPERSAL.....EXCELLENT (155300 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT) THEN BECOMING
                    MOSTLY CLEAR (15-25 PERCENT). ISOLATED RAIN
                    SHOWERS EARLY IN THE EVENING.
MIN TEMPERATURE.....31-36.
MAX HUMIDITY........80-84 PERCENT.
20 FOOT WINDS.......WEST WINDS 10 TO 20 MPH. GUSTS UP TO 25
                    MPH DECREASING TO 15 MPH IN THE LATE EVENING
                    AND OVERNIGHT.
RIDGE TOP WINDS.....WEST AROUND 25 MPH SHIFTING TO THE SOUTHWEST 15
                    TO 20 MPH IN THE LATE EVENING AND OVERNIGHT.
LAL.................1.
CHC OF WETTING RAIN.3 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3900-4900 FT AGL DECREASING TO 1500 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST 18 TO 25 MPH.
SMOKE DISPERSAL.....GOOD (83000 KNOT-FT) DECREASING TO POOR (24300
                    KNOT-FT) BY MIDNIGHT.

.TUESDAY...
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT).
MAX TEMPERATURE.....60-63.
MIN HUMIDITY........25-30 PERCENT.
20 FOOT WINDS.......SOUTHWEST WINDS 11 TO 15 MPH WITH GUSTS TO
                    AROUND 25 MPH.
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.
MIXING HEIGHT.......3200-4200 FT AGL INCREASING TO 6400-7400 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 20 TO 24 MPH.
SMOKE DISPERSAL.....GOOD (67400 KNOT-FT) INCREASING TO VERY GOOD
                    (131000 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...PARTLY CLOUDY. LOWS IN THE MID 30S. SOUTH WINDS
AROUND 10 MPH.
.WEDNESDAY...MOSTLY CLOUDY. CHANCE OF SHOWERS...SNOW AND ISOLATED
THUNDERSTORMS. LOWS IN THE MID 30S. HIGHS IN THE MID 60S. WINDS
GENERALLY LESS THAN 10 MPH.
.THURSDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS. LOWS IN
THE LOWER 30S. HIGHS IN THE LOWER 60S. WINDS GENERALLY LESS THAN
10 MPH.
.FRIDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND SNOW
SHOWERS. LOWS IN THE MID 30S. HIGHS IN THE LOWER 60S. WINDS
GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...LYNOTT
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20100920.ANTEL.02/RIW