FNUS75 KRIW 211454
FWSRIW

SPOT FORECAST FOR WASHAKIE ASPEN RX...FOREST SERVICE
NATIONAL WEATHER SERVICE RIVERTON WY
854 AM MDT WED MAR 21 2012

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON MARCH 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...HIGH PRESSURE IS FIRMLY IN PLACE TODAY WITH STEADILY
RISING TEMPERATURES THROUGH FRIDAY AND FALLING RHS TODAY AND TOMORROW
WITH TEMPS AND RHS LEVELING OFF THROUGH THE WEEKEND. THE DAY IS
STARTING OFF A LITTLE WARMER AND DRIER THAN ANTICIPATED YESTERDAY.
TEMPERATURES WERE BUMPED UP A FEW DEGREES AND RHS WERE DROPPED A
FEW PERCENTAGE POINTS OVER PREVIOUS FORECAST.

WINDS WILL BE MAINLY TERRAIN DRIVEN TODAY AND TOMORROW WITH A
WEST-NORTHWEST WIND AT RIDGE TOP. BY IGNITION TIME...MIXING UP TO
2000 FT AGL SHOULD OCCUR WITH FULL MIXING TO 6000 FT AGL BY
1600...THIS SHOULD START MIXING DOWN SOME OF THE UPPER LEVEL
WESTERLIES WITH A FEW 15 TO 25 MPH GUSTS POSSIBLE. WINDS WILL BE A
LITTLE STRONGER OVERALL ON FRIDAY AS A THERMAL TROUGH FORMS EAST
OF CASPER...INCREASING THE SURFACE GRADIENT...BECOMING STRONGER IN
THE AFTERNOON.

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

FORECASTER...ALLEN

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT).
MAX TEMPERATURE.....46-51.
MIN HUMIDITY........25-30 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH G15 BECOMING WEST AROUND
                    10 MPH AFTER 1300 WITH OCCASIONAL 15-20 MPH GUSTS.
RIDGE TOP WINDS.....NORTHWEST AROUND 15 MPH BECOMING WEST AFTER 1300.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1900 FT AGL INCREASING TO 5500-6000 FT AGL IN
                    THE AFTERNOON.
TRANSPORT WINDS.....WEST 12 TO 17 MPH.
SMOKE DISPERSAL.....FAIR TO GOOD AFTER 1300 (45000-65000 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
MIN TEMPERATURE.....30-35.
MAX HUMIDITY........65-68 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4-7 MPH.
RIDGE TOP WINDS.....NORTHWEST 15 TO 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......DECREASING TO 2000 FT AGL.
TRANSPORT WINDS.....WEST 15 TO 20 MPH.
SMOKE DISPERSAL.....BECOMING POOR (20100-25600 KNOT-FT).

.THURSDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....53-58.
MIN HUMIDITY........17-22 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING WEST 7
                    TO 12 MPH IN THE LATE MORNING AND AFTERNOON.
                    GUSTS UP TO 20 MPH AFTER 1300.
RIDGE TOP WINDS.....WEST 15 TO 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2300 INCREASING TO 6000 FT AGL.
TRANSPORT WINDS.....WEST 15 TO 20 MPH.
SMOKE DISPERSAL.....FAIR BECOMING GOOD (42500-60000 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY NIGHT...MOSTLY CLEAR. LOWS IN THE MID 30S. WEST WINDS
AROUND 12 MPH.
.FRIDAY...MOSTLY CLEAR. LOWS IN THE LOWER 30S. HIGHS IN THE MID
50S. SOUTHWEST WINDS AROUND 12 MPH.
.SATURDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE UPPER
50S. SOUTHWEST WINDS AROUND 12 MPH.
.SUNDAY...PARTLY CLOUDY. LOWS IN THE MID 30S. HIGHS AROUND 60.
SOUTHWEST WINDS AROUND 16 MPH.

$$

FORECASTER...ALLEN
REQUESTED BY...CDC
REASON FOR REQUEST...PRESCRIBED
.TAG 20120321.WASHA.01/RIW