FNUS75 KRIW 051040
FWSRIW

SPOT FORECAST FOR UPPER CLARKS FORK RX...USFS SHF
NATIONAL WEATHER SERVICE RIVERTON WY
440 AM MDT THU APR 5 2012

FORECAST IS BASED ON IGNITION TIME OF 1200 MDT ON APRIL 05.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...A COOLER SOUTHEAST UPSLOPE FLOW...WILL PREVAIL
TODAY BEHIND A COLD FRONT THAT PUSHED THROUGH WEDNESDAY EVENING.
SOME CLEARING WILL OCCUR THIS MORNING THROUGH EARLY AFTERNOON.
CLOUDS WILL THEN INCREASE LATE THIS AFTERNOON AHEAD OF AN
APPROACHING PACIFIC LOW PRESSURE SYSTEM AND ASSOCIATED COLD FRONT.
THIS SYSTEM WILL PUSH ACROSS THE AREA FRIDAY MORNING WITH A SHARP
WIND SHIFT FROM THE WEST...FOLLOWED BY A MUCH COOLER AIRMASS. SNOW
SHOWERS WILL INCREASE LATE THIS EVENING WITH THE BEST CHANCE OF
ACCUMULATING SNOW WITH AND BEHIND THE FRONT FRIDAY INTO FRIDAY
NIGHT.


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

FORECASTER...MEUNIER

.TODAY...
SKY/WEATHER.........DECREASING CLOUDS THROUGH THE MORNING WITH PARTLY
                    CLOUDY SKIES (30-40 PERCENT) BY NOON.  THEN INCREASING
                    CLOUDS AFTER 1600L WITH ISOLATED RAIN AND SNOW SHOWERS.
MAX TEMPERATURE.....45-48.
MIN HUMIDITY........31-34 PERCENT.
20 FOOT WINDS.......NORTHEAST AROUND 5 MPH...BECOMING SOUTHEAST 5 TO 9 MPH
                    LATE MORNING.
RIDGE TOP WINDS.....SOUTHEAST AROUND 10 MPH.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2300-3300 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 15 MPH.
SMOKE DISPERSAL.....POOR TO FAIR (20500-42800 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........BECOMING CLOUDY (80-90 PERCENT). SCATTERED SNOW SHOWERS
                    DEVELOPING LATE EVENING.
MIN TEMPERATURE.....23-26.
MAX HUMIDITY........94-97 PERCENT.
20 FOOT WINDS.......SOUTHEAST 5 TO 10 MPH.
RIDGE TOP WINDS.....SOUTHEAST 10 TO 15 MPH.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1600-2600 FT AGL.
TRANSPORT WINDS.....SOUTHEAST AROUND 10 MPH.
SMOKE DISPERSAL.....POOR.

.FRIDAY...
SKY/WEATHER.........CLOUDY (80-90 PERCENT) WITH SNOW SHOWERS LIKELY.
MAX TEMPERATURE.....34-37.
MIN HUMIDITY........45-48 PERCENT.
20 FOOT WINDS.......SOUTHEAST 5-9 MPH EARLY...THEN A SHARP WIND
                    SHIFT FROM THE WEST AROUND 0800L AND INCREASING TO
                    15 TO 20 MPH WITH GUSTS TO 30 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHEAST AROUND 10 MPH SHIFTING TO THE
                    WEST SOUTHWEST AROUND 0800L AND INCREASING
                    TO 20 TO 25 MPH AFTER NOON.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1800-2800 FT AGL INCREASING TO 4000-5000 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHEAST AROUND 10 MPH SHIFTING TO THE WEST 20 TO
                    TO 25 MPH IN THE LATE MORNING AND AFTERNOON.
SMOKE DISPERSAL.....POOR THROUGH 0800L...BECOMING GOOD IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...CLOUDY WITH CHANCE OF SNOW SHOWERS. LOWS AROUND
17. WEST WINDS 10 TO 15 MPH.

.SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SNOW SHOWERS.
LOWS AROUND 19. HIGHS IN THE UPPER 30S. WEST WINDS 10 TO 15 MPH.

.SUNDAY...NOT AS COOL. MOSTLY CLEAR. LOWS IN THE MID 20S. HIGHS
IN THE UPPER 40S. WINDS GENERALLY LESS THAN 10 MPH.

.MONDAY...MOSTLY CLEAR. LOWS IN THE UPPER 20S. HIGHS IN THE MID
50S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...CLINT DAWSON
REASON FOR REQUEST...PRESCRIBED
.TAG 20120405.UPPER.01/RIW