FNUS75 KRIW 091557
FWSRIW

SPOT FORECAST FOR LITTLE BROWN FIRE...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
957 AM MDT WED SEP 9 2009

FORECAST IS BASED ON REQUEST TIME OF 0917 MDT ON SEPTEMBER 09.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A WEAK UPPER LEVEL RIDGE OF HIGH PRESSURE IS CENTERED OVER WESTERN WYOMING THIS
MORNING. THE RIDGE WILL GRADUALLY WEAKEN TONIGHT AS A STRONG PACIFIC
TROUGH MOVES EASTWARD ALONG THE CANADIAN BORDER. THE ASSOCIATED
DRY SURFACE BACK-DOOR COLD FRONT WILL MOVE SOUTHWARD THROUGH
WESTERN WYOMING THURSDAY EVENING. COOLER TEMPERATURES...EAST
WIND...AND HIGHER RELATIVE HUMIDITY LEVELS ARE EXPECTED OVER
WEST- CENTRAL WYOMING ON FRIDAY AND SATURDAY AS A RESULT OF THE
FRONTAL PASSAGE. A SLIGHT CHANCE FOR A LIGHT RAIN SHOWER IS
POSSIBLE SATURDAY AFTERNOON AND EVENING.

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

FORECASTER...CHURCH

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....67-71.
MIN HUMIDITY........13-16 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 4-7 MPH.
RIDGE TOP WINDS.....WEST 10 TO 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3700 FT AGL INCREASING TO 7400 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST 8 TO 16 MPH.
SMOKE DISPERSAL.....GOOD (82600 KNOT-FT) IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
MIN TEMPERATURE.....41-45.
MAX HUMIDITY........41-46 PERCENT.
20 FOOT WINDS.......WEST WINDS 5 TO 10 MPH WITH GUSTS TO AROUND 15
                    MPH EARLY IN THE EVENING BECOMING
                    DOWNSLOPE/DOWNVALLEY 4-7 MPH.
RIDGE TOP WINDS.....WEST 5 TO 10 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3700 FT AGL DECREASING TO 500 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....WEST 10 TO 15 MPH.
SMOKE DISPERSAL.....POOR TO FAIR (4900-45900 KNOT-FT).

.THURSDAY...
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT).
MAX TEMPERATURE.....74-77.
MIN HUMIDITY........14-17 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING NORTHWEST
                    6 TO 10 MPH WITH GUSTS TO 14 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....NORTHWEST 10 TO 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4500 FT AGL INCREASING TO 8500 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....NORTHWEST 12 TO 18 MPH.
SMOKE DISPERSAL.....FAIR (46700 KNOT-FT) INCREASING TO VERY GOOD
                    (122500 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY NIGHT...PARTLY CLOUDY. LOWS IN THE LOWER 40S. WINDS
GENERALLY LESS THAN 10 MPH.
.FRIDAY...COOLER. MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN
THE MID 60S. WINDS EAST 10 TO 15 MPH.
.SATURDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE MID
60S. WINDS EAST 10 TO 15 MPH.
.SUNDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE UPPER
60S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...CHURCH
REQUESTED BY...ROJO
REASON FOR REQUEST...WILDFIRE
.TAG 20090909.LITTL.01/RIW