FNUS75 KRIW 190409
FWSRIW

SPOT FORECAST FOR CEDAR FIRE...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
1009 PM MDT FRI SEP 18 2009

FORECAST IS BASED ON REQUEST TIME OF 2139 MDT ON SEPTEMBER 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...AN UPPER LEVEL TROUGH WILL MOVE INTO THE NORTHWEST U.S. SATURDAY
WITH 20 FOOT UPSLOPE WIND MIXING OUT FROM THE SOUTHWEST IN THE AFTERNOON.
WIDELY SCATTERED THUNDERSTORMS WILL DEVELOP OVER SOUTHEAST IDAHO AND
MOVE INTO THE AREA PRIMARILY AFTER 1500.  THUNDERSTORM COVERAGE WILL
DECREASE AFTER SUNSET SATURDAY EVENING...BUT ISOLATED THUNDERSTORMS
MAY LINGER OVER NIGHT AHEAD OF THE APPROACHING TROUGH.

A STRONG COLD FRONT WILL MOVE THROUGH THE AREA AROUND MIDDAY SUNDAY.


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

FORECASTER...MEUNIER

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....44-47.
MAX HUMIDITY........62-65 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY OR SOUTHEAST 4-7 MPH.
RIDGE TOP WINDS.....SOUTH 5 TO 10 MPH THIS EVENING...BECOMING SOUTH
                    SOUTHWEST 10 MPH AFTER MIDNIGHT.
LAL.................1.
CHC OF WETTING RAIN.0 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3800 FT AGL DECREASING TO 600 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST 8 TO 10 MPH.
SMOKE DISPERSAL.....POOR (4700-33200 KNOT-FT).

.SATURDAY...
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (35-45 PERCENT)...MOSTLY CLOUDY (60-70 PERCENT)
                    AFTER 1600. WIDELY SCATTERED SHOWERS AND THUNDERSTORMS
                    IN THE AFTERNOON...PRIMARILY AFTER 1500.
MAX TEMPERATURE.....73-78.
MIN HUMIDITY........23-28 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY OR SOUTH 5-9 MPH.  BECOMING WEST SOUTHWEST
                    10 TO 15 MPH WITH GUSTS 20 TO 25 MPH BETWEEN 1400 AND 1600.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN
                    THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST AROUND 10 MPH IN THE MORNING INCREASING TO
                    15 TO 20 MPH IN THE AFTERNOON.
LAL.................1 UNTIL 1400...THEN 3.
CHC OF WETTING RAIN.5 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......5500 FT AGL INCREASING TO 10100 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 10 TO 18 MPH.
SMOKE DISPERSAL.....FAIR (51700 KNOT-FT) INCREASING TO EXCELLENT
                    (151900 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...PARTLY CLOUDY. ISOLATED SHOWERS AND
THUNDERSTORMS IN THE EVENING...THEN SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS AFTER MIDNIGHT. LOWS IN THE UPPER 40S. WINDS
GENERALLY LESS THAN 10 MPH.
.SUNDAY...COOLER. PARTLY CLOUDY WITH CHANCE OF SHOWERS...
THUNDERSTORMS AND SLIGHT CHANCE OF SNOW SHOWERS. LOWS IN THE MID
30S. HIGHS IN THE UPPER 60S. WINDS GENERALLY LESS THAN 10 MPH.
.MONDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE LOWER
60S. WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE
LOWER 70S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...WM  ROLLER
REASON FOR REQUEST...WILDFIRE
.TAG 20090918.CEDAR.01/RIW