FNUS75 KRIW 302049
FWSRIW

SPOT FORECAST FOR HEADWATERS...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
249 PM MDT FRI SEP 30 2011

FORECAST IS BASED ON REQUEST TIME OF 1423 MDT ON SEPTEMBER 30.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A DEVELOPING SOUTH TO SOUTHWEST FLOW ALOFT WILL ALLOW FOR A LIMITED
AMOUNT OF MONSOONAL MOISTURE TO WORK NORTHWARD TONIGHT INTO SATURDAY.
ISOLATED LIGHT SHOWERS ARE POSSIBLE SATURDAY AFTERNOON WITH AN EVEN
SLIMMER CHANCE OF A THUNDERSTORM IN THE AREA. IT WILL CONTINUE QUITE
WARM FOR THIS TIME OF YEAR WITH AN INCREASE IN THE SOUTHWEST WINDS
AT THE SURFACE. INCREASED MOISTURE LEVELS ON SUNDAY MAY RESULT IN
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WITH TEMPERATURES
REMAINING MILD BUT DOWN


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

FORECASTER...SKRBAC

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT).
MIN TEMPERATURE.....31-35.
MAX HUMIDITY........70-73 PERCENT...85-90 ON THE VALLEY FLOOR.
20 FOOT WINDS.......SOUTH-SOUTHWEST WINDS 4 TO 8 MPH...BECOMING
                    DOWNSLOPE/DOWNVALLEY 3-5 MPH AFTER 2000L.
RIDGE TOP WINDS.....SOUTHWEST AROUND 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.

.SATURDAY...
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT). SLIGHT CHANCE OF
                    RAIN SHOWERS AFTER 1200L WITH A SLIGHT CHANCE
                    OF A THUNDERSTORM IN THE AREA AFTER 1400L.
MAX TEMPERATURE.....70-72.
MIN HUMIDITY........22-25 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 3-5 MPH BECOMING SOUTHWEST 10
                    TO 14 MPH WITH GUSTS TO AROUND 20 MPH IN THE
                    AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED
                    NEAR THUNDERSTORMS IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH.
LAL.................1 UNTIL 1200...THEN 2 AFTER 1400L.
CHC OF WETTING RAIN.LESS THAN 5 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
SNOW SHOWERS AFTER MIDNIGHT. LOWS IN THE MID 30S. SOUTHWEST WINDS
AROUND 12 MPH.
.SUNDAY...SLIGHTLY COOLER. PARTLY CLOUDY WITH SCATTERED SHOWERS AND
ISOLATED AFTERNOON THUNDERSTORMS. LOWS IN THE MID 30S.
HIGHS IN THE MID 60S. WINDS GENERALLY LESS THAN 10 MPH.
.MONDAY...PARTLY CLOUDY. SCATTERED SHOWERS...THUNDERSTORMS AND
SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS AROUND 60. WINDS
GENERALLY LESS THAN 10 MPH.
.TUESDAY...MOSTLY CLOUDY WITH SCATTERED SHOWERS...THUNDERSTORMS
AND SNOW SHOWERS. LOWS AROUND 30. HIGHS IN THE LOWER 50S.
SOUTHWEST WINDS AROUND 10 MPH.
.WEDNESDAY...MOSTLY CLOUDY WITH SCATTERED SHOWERS...THUNDERSTORMS
AND SNOW SHOWERS. LOWS IN THE LOWER 20S. HIGHS IN THE UPPER 40S.
SOUTH WINDS AROUND 10 MPH.

$$

FORECASTER...SKRBAC
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20110930.HEADW.01/RIW