FNUS75 KRIW 090842
FWSRIW

SPOT FORECAST FOR LOWER GROS VENTRE RX...IA TDC
NATIONAL WEATHER SERVICE RIVERTON WY
242 AM MDT THU SEP 9 2010

FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON SEPTEMBER 08.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...A STRONG COLD FRONT IS ON TRACK TO MOVE THROUGH
THE AREA THIS AFTERNOON. CLOUDS AND WIND WILL INCREASE LATE
MORNING WITH A FEW SHOWERS AND THUNDERSTORMS DEVELOPING THIS
MORNING. THE COLD FRONT WILL MOVE THROUGH THE AREA BETWEEN 1400
AND 1600 WITH STRENGTHENING SW WINDS AND RAPID INCREASE IN SHOWERS
AND THUNDERSTORMS EXPECTED AHEAD OF THE FRONT AROUND NOON.
WIDESPREAD RAIN AND SNOW WITH LOWERING SNOW LEVELS ARE EXPECTED
THURSDAY EVENING WITH A GOOD CHANCE OF WETTING PRECIPITATION
THURSDAY NIGHT. SNOW LEVELS ARE EXPECTED TO LOWER TO BETWEEN 7500
AND 8000 FEET THURSDAY NIGHT. PRECIPITATION WILL TAPER OFF THROUGH
FRIDAY MORNING WITH A DRIER WESTERLY FLOW PREVAILING FRIDAY
AFTERNOON THROUGH THE WEEKEND...ALONG WITH A WARMING TREND.

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

FORECASTER...MEUNIER

.THURSDAY...
SKY/WEATHER.........INCREASING CLOUDS THROUGH THE MORNING WITH
                    ISOLATED SHOWERS AND THUNDERSTORMS DEVELOPING.
                    SHOWERS RAPIDLY BECOMING MORE NUMEROUS IN
                    THE AFTERNOON. ISOLATED THUNDERSTORMS
                    THROUGH THE AFTERNOON.
MAX TEMPERATURE.....AROUND 60.
MIN HUMIDITY........40-43 PERCENT IN THE MORNING WITH
                    RH LIKELY INCREASING THROUGH THE AFTERNOON.
20 FOOT WINDS.......EAST SOUTHEAST 5-9 MPH BECOMING SOUTH 8 TO 13 MPH WITH
                    GUSTS TO 20 MPH 1000 TO NOON...INCREASING
                    TO 10 TO 15 MPH WITH GUSTS 25 TO 30 MPH EARLY AFTERNOON
                    AND VEERING SOUTHWEST WITH FRONTAL PASSAGE 1400
                    TO 1600. GUSTY AND ERRATIC WINDS EXPECTED
                    NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....SOUTH 15 TO 20 MPH INCREASING TO SOUTHWEST 25
                    TO 30 MPH IN THE AFTERNOON.
LAL.................2.
CHC OF WETTING RAIN.75 PERCENT AFTER NOON.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3700-4700 FT AGL INCREASING TO 6500-7000 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 20 TO 25 MPH SHIFTING TO THE SOUTHWEST
                    AROUND 30 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....GOOD (75900 KNOT-FT) INCREASING TO VERY GOOD
                    (149900 KNOT-FT) IN THE AFTERNOON.

.THURSDAY NIGHT...
SKY/WEATHER.........CLOUDY (90-100 PERCENT). ISOLATED THUNDERSTORMS
                    IN THE EVENING. NUMEROUS RAIN AND SNOW SHOWERS THROUGH
                    THE NIGHT WITH SNOW LEVELS LOWERING TO BETWEEN 7500
                    AND 8000 FEET BY MIDNIGHT.
MIN TEMPERATURE.....35-38.
MAX HUMIDITY........93-96 PERCENT.
20 FOOT WINDS.......SOUTHWEST WINDS 8 TO 13 WITH GUSTS TO 20 MPH.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
                    IN THE EVENING.
RIDGE TOP WINDS.....WEST AROUND 30 MPH SHIFTING TO THE SOUTHWEST 20
                    TO 25 MPH IN THE LATE EVENING AND OVERNIGHT.
LAL.................2 UNTIL 2400...THEN 1.
CHC OF WETTING RAIN.80 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4800-5800 FT AGL DECREASING TO 2600-3600 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST 25 TO 30 MPH.
SMOKE DISPERSAL.....VERY GOOD (124400 KNOT-FT) DECREASING TO GOOD
                    (63900 KNOT-FT) AFTER MIDNIGHT.

.FRIDAY...
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (45-55 PERCENT) IN THE AFTERNOON.
                    SCATTERED RAIN AND SNOW SHOWERS IN THE
                    MORNING...TAPERING OFF BY AFTERNOON.
MAX TEMPERATURE.....50-53.
MIN HUMIDITY........38-43 PERCENT.
20 FOOT WINDS.......SOUTHWEST WINDS 12 TO 16 MPH WITH GUSTS TO
                    AROUND 25 MPH.
RIDGE TOP WINDS.....SOUTHWEST 20 TO 25 MPH.
LAL.................1.
CHC OF WETTING RAIN.10 PERCENT IN THE MORNING.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3100-4100 FT AGL INCREASING TO 5400-6400 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AROUND 25 MPH.
SMOKE DISPERSAL.....GOOD (70900 KNOT-FT) INCREASING TO VERY GOOD
                    (125500 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...PARTLY CLOUDY. LOWS IN THE LOWER 30S. SOUTHWEST
WINDS AROUND 10 MPH.
.SATURDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE LOWER
60S. SOUTHWEST WINDS AROUND 11 MPH.
.SUNDAY...PARTLY CLOUDY. LOWS IN THE UPPER 30S. HIGHS IN THE MID
60S. WINDS GENERALLY LESS THAN 10 MPH.
.MONDAY...PARTLY CLOUDY. LOWS IN THE UPPER 30S. HIGHS IN THE MID
60S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...MACK MCFARLAND
REASON FOR REQUEST...PRESCRIBED
.TAG 20100908.LOWER.01/RIW