FNUS75 KRIW 101356
FWSRIW

SPOT FORECAST FOR DRY VEE...BLM CAD
NATIONAL WEATHER SERVICE RIVERTON WY
756 AM MDT THU SEP 10 2009

FORECAST IS BASED ON REQUEST TIME OF 0721 MDT ON SEPTEMBER 10.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
WESTERLY FLOW ALOFT THIS MORNING WILL GRADUALLY GIVE WAY TO
NORTHWESTERLY FLOW BY THIS AFTERNOON AS A TROUGH MOVES THROUGH
NORTHEAST MONTANA. THE ASSOCIATED SURFACE COLD FRONT WELL AHEAD OF
THE UPPER TROUGH WILL SAG SOUTHWARD THROUGH SOUTHWEST JOHNSON
COUNTY AND THE FIRE AREA DURING THE EARLY AFTERNOON. WIND WILL
TRANSITION FROM LIGHT UPSLOPE TO LIGHT NORTHEASTERLY BEHIND THE DRY
FRONT. RELATIVE HUMIDITY LEVELS WILL INCREASE DURING THE EVENING
HOURS AND CONTINUE TO SLOWLY INCREASE OVERNIGHT AS THE
NORTHEASTERLY UPSLOPE GRADUALLY DEEPENS. THE PREVIOUSLY MENTIONED UPPER
TROUGH WILL CLOSE OFF OVER THE WESTERN DAKOTAS AND BEGIN TO
RETROGRADE (MOVE WESTWARD) FRIDAY...WHILE STRONG HIGH PRESSURE
RAPIDLY BUILDS OVER THE PACIFIC NORTHWEST. DEEP HIGH PLAINS/GULF
MOISTURE WILL INCREASE OVER THE AREA FRIDAY AFTERNOON...WITH
ENOUGH MOISTURE AND ATMOSPHERIC LIFT PRESENT OVER THE AREA BY LATE
FRIDAY EVENING...AREAS OF LOW CLOUDS AND SPRINKLES/LIGHT RAIN WILL
DEVELOP ALONG THE EASTERN SLOPES OF THE BIG HORN MOUNTAINS. A GOOD
CHANCE FOR WIDESPREAD LIGHT RAIN IS EXPECTED SATURDAY AS THE COOL
UPSLOPE FLOW CONTINUES.

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

FORECASTER...CHURCH

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT).
MAX TEMPERATURE.....79-82.
MIN HUMIDITY........12-15 PERCENT.
20 FOOT WINDS.......BECOMING UPSLOPE/UPVALLEY 3-6 MPH DURING THE LATE
                    MORNING...THEN BECOMING NORTHEAST
                    5-8 MPH DURING THE EARLY AFTERNOON.
RIDGE TOP WINDS.....WEST NORTHWEST 5 TO 10 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.

.TONIGHT...
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT).
MIN TEMPERATURE.....44-47.
MAX HUMIDITY........60-65 PERCENT.
20 FOOT WINDS.......NORTHEAST WINDS 6 TO 9 MPH WITH GUSTS TO 13 MPH
                    DURING THE EVENING...BECOMING NORTH-NORTHEAST 4 TO
                    8 MPH AFTER MIDNIGHT.
RIDGE TOP WINDS.....NORTH-NORTHWEST 15 TO 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.

.FRIDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....58-62.
MIN HUMIDITY........33-37 PERCENT.
20 FOOT WINDS.......NORTHEAST 5-9 MPH.
RIDGE TOP WINDS.....NORTH 10 TO 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...MOSTLY CLOUDY. SLIGHT CHANCE FOR LIGHT RAIN SHOWERS/SPRINKLES.
LOWS IN THE LOWER 40S. NORTHEAST WINDS 5 TO 10 MPH.
.SATURDAY...MOSTLY CLOUDY. GOOD CHANCE OF LIGHT RAIN. LOWS AROUND
40. HIGHS IN THE LOWER 50S. WINDS EAST 5 TO 10 MPH.
.SUNDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS. LOWS
AROUND 50. HIGHS IN THE UPPER 60S. WINDS GENERALLY LESS THAN
10 MPH.
.MONDAY...PARTLY CLOUDY. LOWS IN THE UPPER 40S. HIGHS IN THE
LOWER 70S. WEST WINDS AROUND 12 MPH.

$$

FORECASTER...CHURCH
REQUESTED BY...GREGG BUCKALEW
REASON FOR REQUEST...WILDFIRE
.TAG 20090910.DRYVE.01/RIW