FNUS75 KRIW 241941
FWSRIW

SPOT FORECAST FOR ANTELOPE...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
141 PM MDT FRI SEP 24 2010

FORECAST IS BASED ON REQUEST TIME OF 1317 MDT ON SEPTEMBER 24.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
WEST FLOW ALOFT WILL BE OVER THE FIRE AREA TODAY AND TONIGHT SHIFTING
TO THE NORTHWEST SATURDAY AS A LARGE HIGH PRESSURE RIDGE BUILDS OVER
THE GREAT BASIN AND NORTHERN ROCKIES THROUGH THE WEEKEND, BRINGING
WARMER TEMPERATURES AND LOWER RELATIVE HUMIDITY...AND DECREASING WIND
ALOFT.


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

FORECASTER...C.BAKER

.REST OF TODAY...
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT).
MAX TEMPERATURE.....68-71.
MIN HUMIDITY........19-22 PERCENT.
20 FOOT WINDS.......SOUTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO
                    AROUND 25 MPH.
RIDGE TOP WINDS.....SOUTHWEST AROUND 25 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......5800-6800 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 24 TO 26 MPH.
SMOKE DISPERSAL.....VERY GOOD (135400 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
MIN TEMPERATURE.....30-35.
MAX HUMIDITY........75-85 PERCENT.
20 FOOT WINDS.......WEST WINDS 8 TO 12 MPH WITH GUSTS TO AROUND 20
                    MPH IN THE EVENING BECOMING
                    DOWNSLOPE/DOWNVALLEY 4-7 MPH BY 10 PM MDT.
RIDGE TOP WINDS.....WEST 15 MPH SHIFTING TO THE SOUTHWEST
                    AROUND 10 MPH AFTER MIDNIGHT.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......5100-6100 FT AGL DECREASING TO 1100-2100 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.
SMOKE DISPERSAL.....VERY GOOD (108600 KNOT-FT) DECREASING TO POOR
                    (22900 KNOT-FT) BY 10 PM MDT.

.SATURDAY...
SKY/WEATHER.........SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....75-78.
MIN HUMIDITY........16-19 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH.
RIDGE TOP WINDS.....SOUTHWEST 10 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......900-1900 FT AGL INCREASING TO 5000 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....NORTHWEST 15 MPH.
SMOKE DISPERSAL.....POOR IN THE MORNING(13200 KNOT-FT) BECOMING GOOD
                    (75000 KT-FT) AROUND 11 AM.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...CLEAR. LOWS IN THE MID 30S. WINDS GENERALLY
LESS THAN 10 MPH.
.SUNDAY...MOSTLY CLEAR. LOWS IN THE LOWER 30S. HIGHS IN THE UPPER
70S. WINDS GENERALLY LESS THAN 10 MPH.
.MONDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE UPPER
70S. WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...CLEAR. LOWS IN THE LOWER 30S. HIGHS IN THE MID 70S.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...C.BAKER
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20100924.ANTEL.01/RIW