FNUS75 KRIW 182042
FWSRIW

SPOT FORECAST FOR ANTELOPE FIRE...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
242 PM MDT SAT SEP 18 2010

FORECAST IS BASED ON REQUEST TIME OF 1419 MDT ON SEPTEMBER 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
DRY CONDITIONS EXPECTED OVER THE FIRE THROUGH SUNDAY
EVENING...WITH THE ELEVATED SOUTHWESTERLY WIND EXPECTED TO LINGER
INTO THE EVENING HOURS. WARMING TEMPERATURES EXPECTED FOR SUNDAY
UNDER THE INFLUENCE OF A RIDGE OF PRESSURE. THIS SAME SYSTEM WILL
CAUSE DAYTIME HUMIDITY OVER THE FIRE TO DECREASE INTO THE LOW
TEENS SUNDAY AFTERNOON. INCREASED SOUTHWESTERLY WIND WILL AGAIN BE
FOUND OVER THE FIRE SUNDAY AFTERNOON... WITH SURFACE WIND OF 15 TO
20 MPH AND GUSTS TO AROUND 30 MPH POSSIBLE. THE COMBINATION OF THE
ELEVATED WIND...LOW HUMIDITY AND WARMER TEMPERATURES MAY BRING
ELEVATED FIRE WEATHER CONCERNS OVER THE FIRE...THOUGH THESE LEVELS ARE
NOT EXPECTED TO BE CRITICAL AT THIS TIME. AN APPROACHING AREA OF
LOW PRESSURE AND ASSOCIATED COLD FRONT WILL IMPACT THE FIRE SUNDAY
NIGHT...SPREADING SOME ISOLATED SHOWERS ACROSS THE AREA. COOLER
TEMPERATURES AND ELEVATED HUMIDITY ALSO EXPECTED BY MONDAY.


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

FORECASTER...BRANHAM

.TODAY...
SKY/WEATHER.........PARTLY CLOUDY (40-65 PERCENT).
MAX TEMPERATURE.....71-75.
MIN HUMIDITY........24-28 PERCENT.
20 FOOT WINDS.......SOUTHWEST 11 TO 14 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........4 OR LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO 7500-8500 FT AGL BY 1500.
TRANSPORT WINDS.....SOUTHWEST 20 TO 25 MPH.
SMOKE DISPERSAL.....VERY GOOD (135800 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT).
MIN TEMPERATURE.....34-38.
MAX HUMIDITY........74-78 PERCENT.
20 FOOT WINDS.......SOUTHWEST WINDS 10 TO 15 MPH AND GUSTY.
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.......DECREASING TO 1900-2900 FT AGL BY 0200.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.
SMOKE DISPERSAL.....DECREASING TO POOR (38800 KNOT-FT) BY 0200.

.SUNDAY...
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT).
MAX TEMPERATURE.....76-80.
MIN HUMIDITY........12-15 PERCENT.
20 FOOT WINDS.......SOUTH WINDS 10 TO 15 MPH WITH HIGHER GUSTS
                    BECOMING SOUTHWEST 15 TO 20 MPH WITH GUSTS TO
                    AROUND 30 MPH.
RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH INCREASING TO 20 TO 25
                    MPH AFTER 1200.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO 7400-8400 FT AGL BY 1300.
TRANSPORT WINDS.....SOUTHWEST 18 TO 26 MPH.
SMOKE DISPERSAL.....INCREASING TO EXCELLENT (158500 KNOT-FT)
                    BY 1200.

.FORECAST DAYS 3 THROUGH 5...
.SUNDAY NIGHT...PARTLY CLOUDY. ISOLATED SHOWERS AFTER MIDNIGHT.
LOWS IN THE MID 30S. SOUTHWEST WINDS AROUND 12 MPH.
.MONDAY...COOLER. MOSTLY CLOUDY WITH SCATTERED SHOWERS...ISOLATED
THUNDERSTORMS AND SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS IN
THE LOWER 60S. WEST WINDS AROUND 10 MPH.
.TUESDAY...PARTLY CLOUDY. LOWS IN THE LOWER 30S. HIGHS IN THE MID
60S. SOUTH WINDS AROUND 10 MPH.
.WEDNESDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS...SNOW SHOWERS
AND ISOLATED THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS IN THE
MID 60S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...BRANHAM
REQUESTED BY...EDWIN FOLTS
REASON FOR REQUEST...WILDFIRE
.TAG 20100918.ANTEL.01/RIW