FNUS75 KRIW 081157
FWSRIW

SPOT FORECAST FOR DITCH CREEK...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
557 AM MDT TUE SEP 8 2009

FORECAST IS BASED ON IGNITION TIME OF 1910 MDT ON SEPTEMBER 07.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
VERY DRY AIR IS SETTING UP JUST ABOVE THE WESTERN VALLEYS WITH
SOME OF THE HIGHER MOUNTAIN SENSORS REPORTING SINGLE DIGIT TO
BELOW ZERO DEW POINTS THIS MORNING. MAIN CONCERN WILL BE HOW
LOW THE MINIMUM RH'S WILL BE TODAY. OTHERWISE...IT WILL BE MOSTLY
SUNNY TODAY THROUGH WEDNESDAY WITH NO SIGNIFICANT WINDS EXPECTED.
INCREASING WEST TO NORTHWEST WINDS ARE EXPECTED THURSDAY AS A NEW
COLD FRONT BEGINS MOVING THROUGH.

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

FORECASTER...SKRBAC

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT).
MAX TEMPERATURE.....59-62.
MIN HUMIDITY........10-15 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 4-6 MPH.
RIDGE TOP WINDS.....SOUTHWEST 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.......3000 FT AGL INCREASING TO 5500 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 12 TO 15 MPH.
SMOKE DISPERSAL.....POOR TO GOOD (36000-80000 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT).
MIN TEMPERATURE.....31-34.
MAX HUMIDITY........40-45 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4-7 MPH.
RIDGE TOP WINDS.....SOUTHWEST 10 TO 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......2900 FT AGL DECREASING TO 400 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST AROUND 12 MPH.
SMOKE DISPERSAL.....POOR (4800-34000 KNOT-FT).

.WEDNESDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (25-35 PERCENT).
MAX TEMPERATURE.....67-70.
MIN HUMIDITY........13-18 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 4-7 MPH.
RIDGE TOP WINDS.....WEST TO SOUTHWEST 10 TO 15 MPH...GUSTS TO 20 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 INCREASING TO 6000 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 13 TO 16 MPH.
SMOKE DISPERSAL.....FAIR BECOMING GOOD IN THE AFTERNOON.
                    (47000-96000 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY NIGHT...MOSTLY CLEAR. LOWS IN THE LOWER 40S. WINDS
GENERALLY LESS THAN 10 MPH.
.THURSDAY...MOSTLY CLEAR. LOWS IN THE MID 40S. HIGHS AROUND 70.
WINDS GENERALLY LESS THAN 10 MPH...EXCEPT WINDY OVER THE RIDGES.
.FRIDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE MID
60S. WINDS GENERALLY LESS THAN 10 MPH.
.SATURDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE
UPPER 60S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...SKRBAC
REQUESTED BY...ROJO
REASON FOR REQUEST...PRESCRIBED
.TAG 20090907.DITCH.01/RIW