FNUS75 KRIW 121623
FWSRIW

SPOT FORECAST FOR SAND DRAW...BLM WOD
NATIONAL WEATHER SERVICE RIVERTON WY
923 AM MST TUE JAN 12 2010

FORECAST IS BASED ON IGNITION TIME OF 1000 MST ON JANUARY 12.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...THE UPPER LEVEL HIGH PRESSURE RIDGE HAS SHIFTED TO THE
EAST WITH INCREASING SOUTHWEST FLOW ALOFT OVER THE BURN AREA. THIS WILL
INCREASE THE UPSLOPE UP CANYON BREEZES OVER THE AREA AND INCREASE SMOKE
TRANSPORT WINDS.  THE THERMAL BELT WILL REMAIN MILD WITH LOW RELATIVE
HUMIDITY.  USING HYATT HIGH RAWS IMPLIES THAT THE BURN AREA IS ABOVE THE
INVERSION THAT IS OVER THE BIGHORN BASIN.  IF THIS IS NOT THE CASE THEN
THE FOLLOWING FORECAST IS INVALID AND ONSIGHT OBSERVATIONS WILL BE
REQUIRED TO OBTAIN AN ACCURATE FORECAST.

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

FORECASTER...C.BAKER

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....49-53.
MIN HUMIDITY........15-20 PERCENT.
WIND (20 FT)........UPSLOPE/UPVALLEY 5-9 MPH.
RIDGE TOP WINDS.....SOUTHWEST AT 15 MPH.
HAINES INDEX........4.
MIXING HEIGHT.......INCREASING TO 3500 TO 4000 FEET BY 1 PM.
TRANSPORT WINDS.....SOUTHWEST AT 15 MPH.
SMOKE DISPERSAL.....BECOMING FAIR 52500 KT/FT TO GOOD 60000 KT/FT BY NOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (25-35 PERCENT).
MIN TEMPERATURE.....28-32.
MAX HUMIDITY........35-40 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS AROUND 8 MPH EARLY IN THE EVENING
                    BECOMING DOWNSLOPE/DOWNVALLEY 4-7 MPH...THEN
                    BECOMING SOUTHEAST 8 TO 10 MPH AFTER MIDNIGHT.
RIDGE TOP WINDS.....SOUTHWEST AT 12 MPH.
HAINES INDEX........3.
MIXING HEIGHT.......DECREASING TO BELOW 1000 FEET BY 9 PM.
TRANSPORT WINDS.....VARIABLE AT 8 MPH.
SMOKE DISPERSAL.....BECOMING POOR BY 7 PM.

.WEDNESDAY...
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT).
MAX TEMPERATURE.....48-52.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........UPSLOPE/UPVALLEY 5-9 MPH.
RIDGE TOP WINDS.....SOUTHWEST AT 15 MPH.
HAINES INDEX........4.
MIXING HEIGHT........INCREASING TO 3500 TO 4000 FEET BY 1 PM.
TRANSPORT WINDS.....SOUTHWEST AT 15 MPH.
SMOKE DISPERSAL.....BECOMING FAIR 52500 KT/FT TO GOOD 60000 KT/FT BY NOON.

.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY NIGHT...PARTLY CLOUDY. LOWS IN THE MID 20S. WINDS
GENERALLY LESS THAN 10 MPH.
.THURSDAY...PARTLY CLOUDY. SLIGHT CHANCE OF RAIN AND SNOW. LOWS
AROUND 15. HIGHS IN THE LOWER 40S. WINDS GENERALLY LESS THAN
10 MPH.
.FRIDAY...PARTLY CLOUDY. LOWS AROUND 15. HIGHS IN THE MID 30S.
WINDS GENERALLY LESS THAN 10 MPH.
.SATURDAY...PARTLY CLOUDY. LOWS AROUND 15. HIGHS IN THE MID 30S.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...C.BAKER
REQUESTED BY...GABE HARRY
REASON FOR REQUEST...PRESCRIBED
.TAG 20100112.SANDD.01/RIW