FNUS75 KRIW 250930
FWSRIW

SPOT FORECAST FOR ANTELOPE FIRE...NPS
NATIONAL WEATHER SERVICE RIVERTON WY
330 AM MDT SAT SEP 25 2010

IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
HIGH PRESSURE OVER THE REGION WILL RESULT IN A CLEAR SKY TODAY
AND TONIGHT. DAYTIME RELATIVE HUMIDITY WILL BE QUITE LOW.
ADDITIONALLY...SURFACE WINDS WILL BE GENERALLY LIGHT THROUGH
EARLY SUNDAY.  A VERY DRY AIRMASS WILL PUSH INTO THE AREA
SUNDAY AHEAD OF A WEAK COLD FRONT WITH SOUTHWESTERLY BREEZES KICKING
UP IN THE AFTERNOON.  THE FRONT WILL MOVE THROUGH SUNDAY EVENING
WITH DIMINISHING WIND AND A JUMP IN RELATIVE HUMIDITY.

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

FORECASTER...LYNOTT/MEUNIER

.TODAY...
SKY/WEATHER.........SUNNY (5-10 PERCENT).
MAX TEMPERATURE.....70-74.
MIN HUMIDITY........15-21 PERCENT.

20 FOOT WINDS.......UPSLOPE/UPVALLEY OR SOUTH SOUTHWEST 5-9 MPH.
RIDGE TOP WINDS.....WEST AROUND 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 3200-4200 FT AGL
                    IN THE AFTERNOON.

TRANSPORT WINDS.....SOUTH SOUTHWEST 5-9 MPH BECOMING WEST 10 MPH IN THE
                    AFTERNOON.
SMOKE DISPERSAL.....POOR (11600-39500 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....34-38.
MAX HUMIDITY........71-75 PERCENT.

20 FOOT WINDS.......SOUTH WINDS 8 TO 10 MPH WITH GUSTS TO AROUND 15
                    MPH.
RIDGE TOP WINDS.....SOUTHWEST 15 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.......2700-3700 FT AGL DECREASING TO 400-1400 FT AGL
                    AFTER MIDNIGHT.

TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.
SMOKE DISPERSAL.....POOR (13600-39500 KNOT-FT).

.SUNDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-15 PERCENT).
MAX TEMPERATURE.....74-77.
MIN HUMIDITY........12-16 PERCENT.

20 FOOT WINDS.......SOUTHWEST 5-9 MPH INCREASING TO 10 TO 15 MPH WITH
                    GUSTS TO 25 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH INCREASING TO NEAR 25 MPH IN THE
                    AFTERNOON.

LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

MIXING HEIGHT.......1200-2200 FT AGL INCREASING TO 4600-5600 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH INCREASING TO 25 TO 30 MPH
                    IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR INCREASING TO VERY GOOD IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SUNDAY NIGHT...PARTLY CLOUDY. LOWS IN THE MID 30S. WINDS
GENERALLY LESS THAN 10 MPH.
.MONDAY...MOSTLY CLEAR. HIGHS IN THE LOWER 70S. WINDS GENERALLY
LESS THAN 10 MPH.
.TUESDAY...CLEAR. LOWS IN THE MID 30S. HIGHS IN THE LOWER 70S.
WINDS GENERALLY LESS THAN 10 MPH.
.WEDNESDAY...CLEAR. LOWS IN THE MID 30S. HIGHS IN THE UPPER 60S.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...LYNOTT/MEUNIER
REQUESTED BY...ED FOLTS
REASON FOR REQUEST...PRESCRIBED
.TAG 20100924.ANTEL.02/RIW