FNUS75 KRIW 071019
FWSRIW

SPOT FORECAST FOR CYGNET...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
419 AM MDT FRI SEP 7 2012

FORECAST IS BASED ON REQUEST TIME OF 1800 MDT ON SEPTEMBER 06.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

SOME FOG OR LOW CLOUDS WILL BE POSSIBLE THIS MORNING. OTHERWISE...A
RIDGE OF HIGH PRESSURE WILL BEGIN TO BUILD INTO THE REGION TODAY
AND REMAIN IN PLACE FOR SATURDAY. THIS WILL RESULT IN DRY
CONDITIONS AND MAINLY LIGHT AND TERRAIN DRIVEN WINDS. THE TREND
OVER THE NEXT COUPLE OF DAYS WILL BE WARMER TEMPERATURES AND LOWER
HUMIDITY.

A WEAK SYSTEM PUSHING ACROSS THE NORTHERN INTERMOUNTAIN WEST ON
SUNDAY WILL RESULT IN MODEST WESTERLY WINDS DEVELOPING...AND
COULD RESULT IN VERY ISOLATED SHOWERS OR THUNDERSTORMS IN THE
AFTERNOON AND EVENING. WINDIER CONDITIONS ARE EXPECTED MONDAY
WITH A BETTER CHANCE FOR SOME SHOWERS AND THUNDERSTORMS.

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

FORECASTER...MURRELL

.TODAY...
SKY/WEATHER.........SOME FOG/LOW CLOUDS POSSIBLE THIS MORNING.
                    OTHERWISE MOSTLY SUNNY (25 PERCENT) TODAY.
MAX TEMPERATURE.....64.
MIN HUMIDITY........25 PERCENT.
20 FOOT WINDS.......LIGHT AND VARIABLE...BECOMING UPSLOPE/UPVALLEY
                    OR LIGHT NORTHWEST 3-6 MPH.
RIDGE TOP WINDS.....NORTH TO NORTHWEST 4-8 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......500 FT AGL INCREASING TO 4900 FT AGL BY AFTERNOON.
TRANSPORT WINDS.....NORTHWEST 5-10 MPH.
SMOKE DISPERSAL.....POOR INCREASING TO FAIR IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).
MIN TEMPERATURE.....27-31.
MAX HUMIDITY........95 PERCENT.
20 FOOT WINDS.......LIGHT AND VARIABLE 2-5 MPH.
RIDGE TOP WINDS.....NORTHWEST AROUND 5 MPH...BECOMING LIGHT AND
                    VARIABLE.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4500 FT AGL DECREASING TO 500 FT AGL BY 8 PM.
TRANSPORT WINDS.....NORTHWEST AROUND 5 MPH...BECOMING LIGHT AND
                    VARIABLE.
SMOKE DISPERSAL.....POOR.

.SATURDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....AROUND 70.
MIN HUMIDITY........15-20 PERCENT.
20 FOOT WINDS.......LIGHT AND VARIABLE...BECOMING SOUTHWEST
                    4-8 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 5-10 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......500 FT AGL INCREASING TO 6300 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AROUND 10 MPH.
SMOKE DISPERSAL.....POOR INCREASING TO GOOD BY AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...

.SATURDAY NIGHT...MOSTLY CLEAR. LOWS IN THE MID 30S. WINDS
GENERALLY LESS THAN 10 MPH.

.SUNDAY...PARTLY CLOUDY WITH A VERY SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE UPPER 30S. HIGHS IN THE UPPER 60S.
WEST TO SOUTHWEST WINDS AROUND 10 MPH. GUSTS TO 20 MPH.

.MONDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS AROUND 30. HIGHS IN THE UPPER 60S. SOUTHWEST
WINDS 10-15 MPH. GUSTS TO 25 MPH.

.TUESDAY...COOLER. PARTLY CLOUDY. LOWS IN THE UPPER 20S. HIGHS IN
THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MURRELL
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20120906.CYGNE.01/RIW