FNUS75 KRIW 041520
FWSRIW

SPOT FORECAST FOR WASHAKIE PILES - DICKINSON PARK...USFS
NATIONAL WEATHER SERVICE RIVERTON WY
920 AM MDT THU OCT 4 2012

FORECAST IS BASED ON IGNITION TIME OF 1200 MDT ON OCTOBER 04.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A SERIES OF WEAK WEATHER SYSTEMS WILL SWING SOUTH ACROSS WYOMING
THROUGH SATURDAY AS A COLD NORTHERLY FLOW REMAINS OVER THE DISTRICT.
THE FIRST OF THOSE SYSTEMS WILL PASS THROUGH CENTRAL WYOMING
TONIGHT. ANOTHER SURGE OF COLD AIR...CLOUD COVER...AND A CHANCE OF
LIGHT SNOW WILL ACCOMPANY THIS SYSTEM. THE SECOND WEATHER SYSTEM
BRINGS ANOTHER CHANCE OF SNOW FRIDAY NIGHT AS IT TRACKS THROUGH THE
REGION. EXPECT UNSEASONABLY COLD TEMPERATURES TO CONTINUE THROUGH
SATURDAY BEFORE A GRADUAL WARM-UP BEGINS SUNDAY AND MONDAY.

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

FORECASTER...JONES

.TODAY...
SKY/WEATHER.........PARTLY CLOUDY (40-60 PERCENT).
MAX TEMPERATURE.....35-38.
MIN HUMIDITY........40-43 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 4 TO 7 MPH.
RIDGE TOP WINDS.....VARIABLE AT 5 TO 10 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......RISING TO AROUND 2500 FT AGL BY 1500L.
TRANSPORT WINDS.....BECOMING SOUTHWEST AROUND 10 MPH BY 1500L.
SMOKE DISPERSAL.....POOR.

.TONIGHT...
SKY/WEATHER.........BECOMING CLOUDY BETWEEN 2000L AND 2200L.
                    A CHANCE OF SNOW AFTER MIDNIGHT.
MIN TEMPERATURE.....21-24.
MAX HUMIDITY........78-81 PERCENT.
20 FOOT WINDS.......BECOMING DOWNSLOPE/DOWNVALLEY 4 TO 7 MPH
                    BY 1900L.
RIDGE TOP WINDS.....WEST AROUND 10 MPH...THEN SHIFTING TO THE
                    NORTHEAST AT 5 TO 10 MPH BY 2200L.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......DECREASING TO LESS THAN 1500 FT AGL BY 2100.
TRANSPORT WINDS.....SOUTHWEST AROUND 10 MPH...THEN SHIFTING TO THE
                    NORTHEAST 5 TO 10 MPH BY 2200.
SMOKE DISPERSAL.....POOR.

.FRIDAY...
SKY/WEATHER.........CLOUDY WITH A CHANCE OF SNOW.
MAX TEMPERATURE.....AROUND 30.
MIN HUMIDITY........59-63 PERCENT.
20 FOOT WINDS.......NORTHEAST AROUND 10 MPH.
RIDGE TOP WINDS.....NORTHEAST AROUND 10 MPH.
LAL.................1.
CHC OF WETTING RAIN.10 PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......SLOWLY RISING TO AROUND 2500 FT AGL BY 1500L.
TRANSPORT WINDS.....NORTHEAST AROUND 8 MPH IN THE MORNING...THEN
                    BECOMING SOUTHWEST 5 TO 10 MPH BY 1500L.
SMOKE DISPERSAL.....POOR.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...CLOUDY WITH A CHANCE OF SNOW. LOWS AROUND 15.
WINDS GENERALLY LESS THAN 10 MPH.
.SATURDAY...DECREASING CLOUDS WITH A SLIGHT CHANCE OF MORNING SNOW.
LOWS AROUND 17. HIGHS IN THE LOWER 30S. WINDS GENERALLY LESS THAN
10 MPH.
.SUNDAY...NOT AS COOL. CLEAR. LOWS IN THE MID 20S. HIGHS IN THE
MID 40S. WINDS GENERALLY LESS THAN 10 MPH.
.COLUMBUS DAY...CLEAR. LOWS IN THE UPPER 20S. HIGHS AROUND 50.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...JONES
REQUESTED BY...BARELA
REASON FOR REQUEST...PRESCRIBED
.TAG 20121004.WASHA.01/RIW