FNUS75 KRIW 231900
FWSRIW

SPOT FORECAST FOR ANTELOPE...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
100 PM MDT THU SEP 23 2010

FORECAST IS BASED ON REQUEST TIME OF 1242 MDT ON SEPTEMBER 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
COOL...STABLE AND DRY WEST NORTHWEST FLOW ALOFT WILL REMAIN OVER THE
FIRE TONIGHT AND FRIDAY.  THE WIND ALOFT WILL SHIFT TO THE NORTHWEST
AS A HIGH PRESSURE RIDGE ALOFT BUILDS OVER THE GREAT BASIN AND NORTHERN
ROCKIES FRIDAY NIGHT AND SATURDAY WITH GRADUAL DRYING AND WARMING TAKING
PLACE OVER THE FIRE THROUGH THE WEEKEND.

...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 (30-40 PERCENT).
MAX TEMPERATURE.....62-65.
MIN HUMIDITY........27-30 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING WEST AROUND
                    12 MPH WITH GUSTS TO AROUND 25 MPH LATE IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....WEST 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.......5700-6700 FT AGL.
TRANSPORT WINDS.....WEST 15 TO 20 MPH.
SMOKE DISPERSAL.....GOOD (98300 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT).
MIN TEMPERATURE.....30-34.
MAX HUMIDITY........75-80 PERCENT.
20 FOOT WINDS.......WEST WINDS 13 TO 14 MPH WITH GUSTS TO
                    AROUND 25 MPH UNTIL 9 PM MDT THEN BECOMING
                    DOWN SLOPE AND DOWN VALLEY 4 TO 8 MPH.
RIDGE TOP WINDS.....WEST AROUND 20 MPH UNTIL 9 PM MDT THEN
                    DECREASING TO 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.......4700-5700 FT AGL DECREASING TO 900-1900 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....WEST 20 MPH DECREASING TO 10 MPH BY 9 PM MDT.
SMOKE DISPERSAL.....GOOD (95900 KNOT-FT) DECREASING TO POOR (19000
                    KNOT-FT) AFTER MIDNIGHT.

.FRIDAY...
SKY/WEATHER.........SOME MORNING STRATUS...THEN MOSTLY SUNNY BY
                    11 AM MDT(10-20 PERCENT).
MAX TEMPERATURE.....62-65.
MIN HUMIDITY........22-25 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH...UNTIL NOON THEN WEST
                    10 TO 15 MPH WITH GUSTS TO AROUND 25 MPH IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....WEST 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.......1700-2700 FT AGL INCREASING TO 5600-6600 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 15 TO 21 MPH INCREASING TO AROUND 25
                    MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (33200 KNOT-FT) INCREASING TO VERY GOOD
                    (111400 KNOT-FT) IN THE AFTERNOON.

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

$$

FORECASTER...C.BAKER
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20100923.ANTEL.01/RIW