FNUS75 KRIW 120237
FWSRIW

SPOT FORECAST FOR BASIN...BLM RSD...CORRECTED FOR WEDNESDAYS RH
NATIONAL WEATHER SERVICE RIVERTON WY
829 PM MDT TUE AUG 11 2009

FORECAST IS BASED ON REQUEST TIME OF 1945 MDT ON AUGUST 11.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...WEST TO SOUTHWEST FLOW WILL CONTINUE OVER SOUTHWEST WYOMING
THROUGH FRIDAY...WITH A RIDGE BUILDING OVER THE FOUR CORNERS AND A
TROUGH SLOWLY MOVING ONSHORE OVER THE PACIFIC NORTHWEST.  THE LOWER
LEVELS WILL REMAIN QUITE DRY...WITH SOME HIGH LEVEL PACIFIC MOISTURE
MOVING THROUGH.  ISOLATED THUNDERSTORMS ARE POSSIBLE THROUGH
THURSDAY.  WILL SEE A TRANSITION FRIDAY AS THE TROUGH MOVES INTO THE
INTERMOUNTAIN WEST.  THE CHANCE OF THUNDERSTORMS WILL INCREASE AS
WELL AS WINDS.  A COLD FRONT WILL MOVE THROUGH FRIDAY NIGHT BRINGING
IN SIGNIFICANTLY COOLER AND MORE HUMID AIR.  SHOWER AND THUNDERSTORM
THREAT WILL PERSIST SATURDAY AND SUNDAY...ESPECIALLY OVER
YELLOWSTONE.

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

FORECASTER...LIPSON

.REST OF TONIGHT...
SKY/WEATHER.........CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....49-51.
MAX HUMIDITY........50-53 PERCENT.
20 FOOT WINDS.......WEST WINDS AROUND 12 MPH AND GUSTY EARLY IN THE
                    EVENING BECOMING DOWNSLOPE/DOWNVALLEY 4-7 MPH BY 0200.
RIDGE TOP WINDS.....WEST 15 TO 20 MPH SHIFTING TO THE SOUTHWEST 10
                    TO 15 MPH AFTER MIDNIGHT.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......8900 FT AGL DECREASING TO 1100 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....WEST 14 TO 21 MPH SHIFTING TO THE SOUTHWEST 12
                    TO 13 MPH AFTER MIDNIGHT.
SMOKE DISPERSAL.....VERY GOOD (133500 KNOT-FT) DECREASING TO POOR
                    (11100 KNOT-FT) AFTER MIDNIGHT.

.WEDNESDAY...
SKY/WEATHER.........SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....85-88.
MIN HUMIDITY........15-17 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH. WINDS BECOMING
                    WEST 10 TO 18 MPH BY 1500.
RIDGE TOP WINDS.....WEST 10 TO 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......1400 FT AGL INCREASING TO 15700 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST 12 TO 16 MPH.
SMOKE DISPERSAL.....POOR (13500 KNOT-FT) INCREASING TO EXCELLENT
                    (204300 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY NIGHT...MOSTLY CLEAR. LOWS IN THE MID 50S. WINDS
GENERALLY LESS THAN 10 MPH.
.THURSDAY...PARTLY CLOUDY. ISOLATED SHOWERS AND THUNDERSTORMS.
LOWS IN THE MID 50S. HIGHS IN THE MID 80S. WINDS GENERALLY LESS
THAN 10 MPH.
.FRIDAY...PARTLY CLOUDY WITH SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS. LOWS AROUND 50. HIGHS AROUND 80. SOUTHWEST WINDS
AROUND 11 MPH.
.SATURDAY...MOSTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS.
LOWS IN THE UPPER 40S. HIGHS IN THE MID 70S. WINDS GENERALLY LESS
THAN 10 MPH.
.SUNDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE UPPER 40S. HIGHS IN THE LOWER 70S.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...LIPSON
REQUESTED BY...EVANS
REASON FOR REQUEST...WILDFIRE
.TAG 20090811.BASIN.01/RIW