FNUS75 KRIW 071155
FWSRIW

SPOT FORECAST FOR UPPER WIND FT6...USFS SHF
NATIONAL WEATHER SERVICE RIVERTON WY
555 AM MDT TUE MAY 7 2013

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON MAY 08.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

A MOIST AND UNSTABLE ATMOSPHERE WILL RESULT IN SCATTERED SHOWERS
AND THUNDERSTORMS DEVELOPING THIS AFTERNOON. SURFACE WINDS...OUTSIDE
OF THUNDERSTORMS...WILL GENERALLY BE LIGHT AND TERRAIN DRIVEN...WITH
MAINLY EASTERLY WINDS AT RIDGE TOP AND FOR TRANSPORT WINDS. THE LIGHT
WINDS WILL RESULT IN ONLY FAIR SMOKE DISPERSAL THIS AFTERNOON. WINDS
COULD BECOME MORE ERRATIC AND GUSTIER NEAR ANY THUNDERSTORM ACTIVITY.
SIMILAR CONDITIONS ARE EXPECTED WEDNESDAY...WITH SLIGHTLY STRONGER
EASTERLY FLOW EXPECTED WITH SMOKE DISPERSAL BECOMING GOOD.

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

FORECASTER...MURRELL

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (20 PERCENT) BECOMING
                    MOSTLY CLOUDY (70-80 PERCENT) BY EARLY
                    AFTERNOON. SCATTERED SHOWERS AND WIDELY
                    SCATTERED THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....54.
MIN HUMIDITY........30 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 4-8 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR ANY THUNDERSTORMS IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....EAST 5-10 MPH.
LAL.................1 UNTIL NOON...THEN 3.
CHC OF WETTING RAIN.10 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1500 FT AGL INCREASING TO 5000-6000 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....NORTHEAST TO EAST 4-8 MPH...BECOMING
                    EAST AROUND 10 MPH.
SMOKE DISPERSAL.....POOR...BECOMING FAIR IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (55-65 PERCENT). SCATTERED
                    SHOWERS AND THUNDERSTORMS IN THE EVENING...THEN
                    ISOLATED RAIN SHOWERS AFTER MIDNIGHT.
MIN TEMPERATURE.....34-38.
MAX HUMIDITY........70 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4-7 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    EVENING.
RIDGE TOP WINDS.....EAST AROUND 10 MPH.
LAL.................3 UNTIL 9 PM...THEN 1.
CHC OF WETTING RAIN.5 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......DECREASING TO 1200 FT AGL.
TRANSPORT WINDS.....EAST AROUND 10 MPH.
SMOKE DISPERSAL.....POOR.

.WEDNESDAY...
SKY/WEATHER.........PARTLY CLOUDY (55-65 PERCENT) THEN BECOMING
                    MOSTLY CLOUDY (70-80 PERCENT). ISOLATED RAIN
                    SHOWERS IN THE MORNING...THEN SCATTERED RAIN
                    SHOWERS AND ISOLATED THUNDERSTORMS IN THE
                    AFTERNOON.
MAX TEMPERATURE.....54-58.
MIN HUMIDITY........25-30 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....EAST AROUND 10 MPH.
LAL.................1 UNTIL NOON...THEN 2.
CHC OF WETTING RAIN.5 PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO 7000-8000 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....EAST 10 TO 15 MPH.
SMOKE DISPERSAL.....GOOD IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...

.WEDNESDAY NIGHT...PARTLY CLOUDY. ISOLATED SHOWERS AND
THUNDERSTORMS IN THE EVENING. LOWS IN THE LOWER 30S. WINDS
GENERALLY LESS THAN 10 MPH.

.THURSDAY...MOSTLY CLOUDY. SHOWERS LIKELY AND SLIGHT CHANCE OF
THUNDERSTORMS. HIGHS IN THE MID 50S. WINDS GENERALLY LESS
THAN 10 MPH.

.FRIDAY...MOSTLY CLOUDY. CHANCE OF SHOWERS AND ISOLATED
THUNDERSTORMS. LOWS IN THE MID 30S. HIGHS IN THE MID 50S.
WINDS GENERALLY LESS THAN 10 MPH.

.SATURDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS AND ISOLATED
THUNDERSTORMS. LOWS IN THE MID 30S. HIGHS IN THE MID 50S. WINDS
GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MURRELL
REQUESTED BY...JAY SLAGOWSKI
REASON FOR REQUEST...PRESCRIBED
.TAG 20130508.UPPER.01/RIW