FNUS75 KRIW 260044
FWSRIW

SPOT FORECAST FOR CRYSTAL...IA TDC
NATIONAL WEATHER SERVICE RIVERTON WY
644 PM MDT WED AUG 25 2010

FORECAST IS BASED ON REQUEST TIME OF 1818 MDT ON AUGUST 25.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

CLEAR AND DRY CONDITIONS ARE EXPECTED TONIGHT AND THURSDAY. A STORM
SYSTEM DEVELOPING OVER THE WEST...WILL RESULT IN DEEP SOUTHWEST FLOW
DEVELOPING OVER WESTERN WYOMING THURSDAY.  HOWEVER...THE FIRE SITE
SHOULD MAINLY BE PROTECTED FROM THE BRUNT OF THE SOUTHWEST WINDS
THURSDAY AFTERNOON...WITH MAINLY UPSLOPE/UPVALLEY WINDS
EXPECTED...WITH A CHANCE OF WINDS SWITCHING TO A SOUTH TO
SOUTHWEST DIRECTION IN THE CRYSTAL CREEK DRAINAGE AROUND 3 PM.
RELATIVE HUMIDITY WILL REMAIN VERY LOW THURSDAY POSSIBLY DIPPING
DOWN TO 10 PERCENT. AS THE STORM SYSTEM APPROACHES THE AREA
FRIDAY...BREEZY WINDS ARE EXPECTED...BUT WITH AN INCREASED
AFTERNOON RELATIVE HUMIDITY...AROUND 20 PERCENT. THERE WILL ALSO
BE INCREASING CHANCES OF SHOWERS AND THUNDERSTORMS FROM LATE
THURSDAY NIGHT INTO THE WEEKEND...WITH THE BEST CHANCE OF
RECEIVING A WETTING RAIN FRIDAY NIGHT AND SATURDAY.

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

FORECASTER...MURRELL

.TONIGHT...
SKY/WEATHER.........CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....35-40 VALLEY. AROUND 50 RIDGE TOP
MAX HUMIDITY........AROUND 70 PERCENT VALLEY.  AROUND 35 PERCENT RIDGE.
20 FOOT WINDS.......BECOMING DOWNSLOPE/DOWNVALLEY 3-6 MPH BY 2000.
RIDGE TOP WINDS.....SOUTHWEST 5 TO 10 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4000 FT AGL DECREASING TO 700 FT AGL
                    BY 2100.
TRANSPORT WINDS.....SOUTHWEST 5 TO 10 MPH.
SMOKE DISPERSAL.....DECREASING TO POOR BY 2100.

.THURSDAY...
SKY/WEATHER.........MOSTLY SUNNY (15 PERCENT).
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........10-15 PERCENT.
20 FOOT WINDS.......BECOMING UPSLOPE/UPVALLEY 4-8 MPH BY 0900...THEN
                    SWITCHING TO SOUTHWEST 5-10 MPH AROUND 1500.
                    GUSTS TO 20 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST AROUND 10 MPH...INCREASING TO 15 MPH
                    BETWEEN 1300 AND 1500. GUSTS TO 30 MPH IN THE
                    AFTERNOON.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3600-4600 FT AGL INCREASING TO 9000 FT
                    AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 10 MPH INCREASING TO AROUND 20
                    MPH DURING THE EARLY AFTERNOON.
SMOKE DISPERSAL.....FAIR INCREASING TO EXCELLENT IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY NIGHT...MOSTLY CLEAR. ISOLATED SHOWERS AFTER MIDNIGHT.
LOWS IN THE MID 40S. SOUTHWEST WINDS 10 TO 15 MPH.

.FRIDAY...PARTLY CLOUDY WITH SCATTERED SHOWERS AND
THUNDERSTORMS. LOWS IN THE LOWER 40S. HIGHS IN THE LOWER 70S.
SOUTHWEST WINDS 10-15 MPH. GUSTS TO 30 MPH.

.SATURDAY...MOSTLY CLOUDY WITH SCATTERED SHOWERS AND
THUNDERSTORMS. LOWS IN THE UPPER 30S. HIGHS AROUND 60. SOUTH
WINDS AROUND 14 MPH.

.SUNDAY...PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE UPPER 30S. HIGHS IN THE UPPER 50S.
WINDS GENERALLY LESS THAN 10 MPH.

.MONDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS...
THUNDERSTORMS AND SNOW SHOWERS. LOWS IN THE MID 30S. HIGHS IN THE
UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MURRELL
REQUESTED BY...TIDC
REASON FOR REQUEST...WILDFIRE
.TAG 20100825.CRYST.01/RIW