FNUS75 KRIW 251858
FWSRIW

SPOT FORECAST FOR CASTLE...USFS SHF
NATIONAL WEATHER SERVICE RIVERTON WY
1258 PM MDT FRI SEP 25 2009

FORECAST IS BASED ON REQUEST TIME OF 1235 MDT ON SEPTEMBER 25.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

HIGH PRESSURE AT THE SURFACE AND ALOFT WILL PRODUCE ANOTHER DRY DAY WITH
ABOVE NORMAL TEMPERATURES...LIGHT...TERRAIN DRIVEN WINDS AND AFTERNOON
RELATIVE HUMIDITY AROUND 10 PERCENT. A WEAK LOW PRESSURE SYSTEM
WILL MOVE ACROSS MONTANA SATURDAY. THIS SYSTEM WILL CAUSE WINDS TO
INCREASE SATURDAY AFTERNOON WITH WEST WIND GUSTING UP TO 25 MPH.
SATURDAY WILL ALSO BE DRY AND WARM.

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

FORECASTER...SMITH

.THIS AFTERNOON...
SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....75-78.
MIN HUMIDITY........9-12 PERCENT.
20 FOOT WINDS.......WEST SOUTHWEST 8-13 MPH WITH GUSTS TO 20
                    MPH...BECOMING WEST 5-9 MPH AFTER 1600.
RIDGE TOP WINDS.....WEST AROUND 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......9000 FT AGL.
TRANSPORT WINDS.....WEST 10 TO 20 MPH.
SMOKE DISPERSAL.....VERY GOOD (100800 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (5-10 PERCENT).
MIN TEMPERATURE.....35-38.
MAX HUMIDITY........54-57 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4-7 MPH.
RIDGE TOP WINDS.....WEST 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.......5000 FT AGL DECREASING TO 300 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....WEST 10 TO 15 MPH.
SMOKE DISPERSAL.....POOR TO FAIR (3700-53200 KNOT-FT).

.SATURDAY...
SKY/WEATHER.........SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....75-78.
MIN HUMIDITY........8-11 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING WEST AROUND
                    15 MPH WITH GUSTS TO AROUND 25 MPH IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....WEST 5 TO 10 MPH INCREASING TO SOUTHWEST 20 TO
                    25 MPH IN THE AFTERNOON.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......500 FT AGL INCREASING TO 6500 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST 10 TO 15 MPH INCREASING TO AROUND 25 MPH
                    LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (5600 KNOT-FT) INCREASING TO VERY GOOD
                    (102900 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...CLEAR. LOWS IN THE MID 30S. WEST WINDS AROUND
10 MPH.
.SUNDAY...MOSTLY CLEAR. LOWS IN THE LOWER 30S. HIGHS IN THE UPPER
60S. WINDS GENERALLY LESS THAN 10 MPH.
.MONDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE LOWER
70S. WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...PARTLY CLOUDY. CHANCE OF SHOWERS...THUNDERSTORMS AND
SNOW SHOWERS. LOWS IN THE UPPER 20S. HIGHS IN THE LOWER 60S.
SOUTHWEST WINDS AROUND 10 MPH.

$$

FORECASTER...SMITH
REQUESTED BY...CLINT DAWSON
REASON FOR REQUEST...WILDFIRE
.TAG 20090925.CASTL.01/RIW