FNUS75 KRIW 091201
FWSRIW

SPOT FORECAST FOR WEST SLOPE BIG HORNS SLASH PILE BURNS...BIA WRA
NATIONAL WEATHER SERVICE RIVERTON WY
501 AM MST WED DEC 9 2009

FORECAST IS BASED ON IGNITION TIME OF 1000 MST ON DECEMBER 09.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...AN ARCTIC AIRMASS WILL REMAIN OVER THE AREA TODAY
WITH A STRENGTHENING NORTHWEST FLOW ALOFT. CLOUDS WILL INCREASE
THROUGH THE AFTERNOON WITH SOME LIGHT SNOW...ACCUMULATION OF ONE-
HALF INCH OR LESS...POSSIBLE. SMOKE DISPERSAL WILL REMAIN POOR
TODAY IN THE COLD STABLE AIRMASS WITH INVERSION HEIGHT NEAR OR
JUST ABOVE THE TOP OF THE BURN.


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

FORECASTER...MEUNIER

.TODAY...
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING
                    MOSTLY CLOUDY (65-75 PERCENT). SLIGHT CHANCE OF
                    SNOW.
MAX TEMPERATURE.....1-4.
MIN HUMIDITY........42-45 PERCENT.
20 FOOT WINDS.......BECOMING WEST NORTHWEST BY IGNITION TIME AT 4 TO 8 MPH WITH
                    OCCASIONAL GUSTS OF 15 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....NORTHWEST 10 TO 15 MPH.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......300 FT AGL INCREASING TO 2900 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....NORTH AROUND 10 MPH.
SMOKE DISPERSAL.....POOR (2700-26300 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (50-60 PERCENT). SLIGHT CHANCE OF
                    SNOW IN THE EVENING.
MIN TEMPERATURE.....12 BELOW-15 BELOW ZERO.
MAX HUMIDITY........84-87 PERCENT.
20 FOOT WINDS.......DOWNSLOPE OR EAST NORTHEAST AROUND 5 MPH.
RIDGE TOP WINDS.....NORTHWEST AROUND 15 MPH.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1100-2100 FT AGL.
TRANSPORT WINDS.....NORTH AROUND 12 MPH.
SMOKE DISPERSAL.....POOR (5700-25000 KNOT-FT).

.THURSDAY...
SKY/WEATHER.........PARTLY CLOUDY (50-60 PERCENT). SLIGHT CHANCE OF
                    SNOW IN THE AFTERNOON.
MAX TEMPERATURE.....2-5.
MIN HUMIDITY........44-47 PERCENT.
20 FOOT WINDS.......WEST NORTHWEST 5-9 MPH WITH GUSTS TO 15 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....NORTHWEST AROUND 15 MPH DECREASING TO AROUND 5
                    MPH LATE IN THE AFTERNOON.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......600-1600 FT AGL.
TRANSPORT WINDS.....NORTH 10 MPH.
SMOKE DISPERSAL.....POOR (2700-14200 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY NIGHT...NOT AS COLD. PARTLY CLOUDY. LOWS AROUND
3 BELOW. WINDS GENERALLY LESS THAN 10 MPH.
.FRIDAY...NOT AS COLD. PARTLY CLOUDY. LOWS AROUND 3. HIGHS AROUND
16. WINDS GENERALLY LESS THAN 10 MPH.
.SATURDAY...MOSTLY CLOUDY. ISOLATED SNOW SHOWERS. LOWS AROUND 8.
HIGHS IN THE MID 20S. WINDS GENERALLY LESS THAN 10 MPH.
.SUNDAY...PARTLY CLOUDY. ISOLATED SNOW SHOWERS. LOWS AROUND 7.
HIGHS IN THE UPPER 20S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...GABE HARRY
REASON FOR REQUEST...PRESCRIBED
.TAG 20091209.WESTS.01/RIW