FNUS75 KRIW 012259
FWSRIW

SPOT FORECAST FOR ANTELOPE...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
459 PM MDT FRI OCT 1 2010

FORECAST IS BASED ON REQUEST TIME OF 1607 MDT ON OCTOBER 01.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A RIDGE OF HIGH PRESSURE WILL PERSIST THROUGH SUNDAY KEEPING
CONDITIONS DRY AND UNSEASONABLY WARM. DRIER AIR ACROSS THE FIRE SITE
ON SATURDAY WILL ALLOW FOR MINIMUM RELATIVE HUMIDITIES TO DROP BY
AROUND 10 PERCENT. AN INCOMING WEATHER SYSTEM WILL BRING COOLER
TEMPERATURES AND AT LEAST A SLIGHT CHANCE OF SHOWERS TO THE FIRE
ON MONDAY AND TUESDAY. THERE COULD BE A PERIOD OF GUSTY SOUTHWEST
WIND ON MONDAY AS THE STORM SYSTEM APPROACHES YELLOWSTONE.

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

FORECASTER...JONES

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR.
MIN TEMPERATURE.....37-40.
MAX HUMIDITY........75-79 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 3 TO 6 MPH UNTIL 1830...THEN
                    BECOMING DOWNSLOPE/DOWNVALLEY 4 TO 7 MPH BY
                    2100.
RIDGE TOP WINDS.....WEST-NORTHWEST AROUND 10 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3500 FT AGL UNTIL 1830...THEN BECOMING LESS
                    THAN 1500 FT AGL BY 2100.
TRANSPORT WINDS.....WEST-NORTHWEST AROUND 10 MPH UNTIL 1900...
                    THEN BECOMING DOWNSLOPE/DOWNVALLEY 5 TO 8 MPH
                    BY 2100.
SMOKE DISPERSAL.....POOR.

.SATURDAY...
SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....73-76.
MIN HUMIDITY........14-17 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 2 TO 5 MPH UNTIL 0800...
                    THEN GRADUALLY BECOMING UPSLOPE/UPVALLEY
                    4 TO 8 MPH BY 1100.
RIDGE TOP WINDS.....WEST-NORTHWEST AROUND 10 MPH UNTIL 1200...THEN
                    INCREASING TO 12 TO 16 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......LESS THAN 1500 FT AGL UNTIL 1200...THEN
                    GRADUALLY INCREASING TO AROUND 5500 FT AGL
                    BY 1500.
TRANSPORT WINDS.....DOWNSLOPE/DOWNVALLEY 4 TO 7 MPH UNTIL 0900...
                    THEN GRADUALLY BECOMING WEST-NORTHWEST
                    AROUND 15 MPH BY 1300.
SMOKE DISPERSAL.....POOR UNTIL 1200...THEN BECOMING GOOD BY 1500.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...MOSTLY CLEAR. LOWS IN THE LOWER 30S.
WINDS GENERALLY LESS THAN 10 MPH.
.SUNDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE UPPER
70S. WINDS GENERALLY LESS THAN 10 MPH.
.MONDAY...COOLER. MOSTLY CLOUDY. SCATTERED SHOWERS. LOWS IN THE
LOWER 30S. HIGHS IN THE UPPER 60S. SOUTHWEST WINDS AROUND 15 MPH
WITH POSSIBLE HIGHER GUSTS IN THE AFTERNOON.
.TUESDAY...PARTLY CLOUDY. A SLIGHT CHANCE OF MORNING SNOW SHOWERS.
A CHANCE OF RAIN SHOWERS IN THE AFTERNOON. LOWS IN THE LOWER 30S.
HIGHS IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH.
.WEDNESDAY...PARTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS...POSSIBLY
AS SNOW IN THE MORNING. LOWS AROUND 30. HIGHS IN THE LOWER 60S.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...JONES
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20101001.ANTEL.01/RIW