FNUS75 KRIW 201430
FWSRIW

SPOT FORECAST FOR LOWER GROS VENTRE...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
830 AM MDT SUN SEP 20 2009

FORECAST IS BASED ON IGNITION TIME OF 0830 MDT ON SEPTEMBER 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...TRAILING EDGE OF THE CLOUD MASS WILL MOVE EAST OF THE
AREA BY LATE MORNING AS THE TROUGH APPROACHES.  SOUTH TO SOUTHWEST
WINDS WILL BECOME NORTHWEST BY THE MID AFTERNOON...MARKING THE
TROUGH PASSAGE. RH'S WILL LIKELY STAY ON THE HIGH SIDE THEN
GRADUALLY DIPPING TO THE 30-40 PERCENT RANGE IN THE LATE AFTERNOON
BEHIND THE TROUGH. ADDITIONAL CLOUD COVER WILL MOVE BACK IN
TONIGHT AS AN UPPER LOW MOVES INTO EASTERN WYOMING FROM MONTANA.
HOWEVER...LITTLE IF ANY SHOWER ACTIVITY IS EXPECTED. MONDAY LOOKS
COOL WITH NORTH FLOW. IT WILL BE QUITE DRY AND SUNNY. TUESDAY
LOOKS SUNNY AND DRY AS WELL...WITH WARMING TEMPERATURES.


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

FORECASTER...T.BAKER

.TODAY...
SKY/WEATHER.........BECOMING MOSTLY SUNNY (15-25 PERCENT) BY LATE MORNING.
                    A LINGERING SHOWER POSSIBLE THIS MORNING.
MAX TEMPERATURE.....50-55.
MIN HUMIDITY........30-36 PERCENT.
20 FOOT WINDS.......SOUTH-SOUTHWEST 5-10 MPH GUSTS TO 17 MPH...BECOMING
                    WEST TO NORTHWEST 10 TO 15 MPH WITH GUSTS TO AROUND 25 MPH
                    AROUND 1400.
RIDGE TOP WINDS.....WEST AROUND 15 MPH INCREASING TO AROUND 25 MPH
                    LATE IN THE AFTERNOON.
LAL.................1.
CHC OF WETTING RAIN.5 PERCENT THIS MORNING.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4000 FT AGL.
TRANSPORT WINDS.....SOUTHWEST TO WEST 20 MPH...BECOMING NORTHWEST AROUND 1400.
SMOKE DISPERSAL.....GOOD (80000 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........INCREASING CLOUDS (55-65 PERCENT) WITH A SLIGHT CHANCE OF
                    RAIN SHOWERS IN THE EVENING. SLIGHT CHANCE OF
                    SNOW SHOWERS LATE IN THE EVENING.
MIN TEMPERATURE.....30-35.
MAX HUMIDITY........70-75 PERCENT.
20 FOOT WINDS.......NORTH WINDS 10 TO 15 MPH WITH GUSTS TO AROUND
                    20 MPH.
RIDGE TOP WINDS.....NORTH 12 TO 18 MPH WITH GUSTS TO 25 MPH.
LAL.................1.
CHC OF WETTING RAIN.LESS THAN 5 PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2000 FT AGL.
TRANSPORT WINDS.....NORTH 20 MPH.
SMOKE DISPERSAL.....FAIR (40000 KNOT-FT).

.MONDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....46-49.
MIN HUMIDITY........17-23 PERCENT.
20 FOOT WINDS.......NORTH TO NORTHEAST 5-10 MPH.
RIDGE TOP WINDS.....NORTH 8 TO 12 MPH GUSTS TO 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4000 FT AGL.
TRANSPORT WINDS.....NORTH 15 MPH.
SMOKE DISPERSAL.....GOOD (60000 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.MONDAY NIGHT...MOSTLY CLEAR. LOWS 25-30. WINDS
GENERALLY LESS THAN 10 MPH.
.TUESDAY...WARMER. MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN
THE LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH.
.WEDNESDAY...MOSTLY CLEAR. LOWS AROUND 40. HIGHS IN THE MID 60S.
WINDS GENERALLY LESS THAN 10 MPH.
.THURSDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE
LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...T.BAKER
REQUESTED BY...PFISTER
REASON FOR REQUEST...PRESCRIBED
.TAG 20090920.LOWER.01/RIW