FNUS75 KRIW 011133
FWSRIW

SPOT FORECAST FOR SOUTH FALL...IA TDC
NATIONAL WEATHER SERVICE RIVERTON WY
533 AM MDT THU AUG 1 2013

FORECAST IS BASED ON REQUEST TIME OF 2217 MDT ON JULY 31.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...THE MAIN WEATHER MAKER TODAY AND TONIGHT WILL BE A
DISTURBANCE MOVING INTO NORTHERN CALIFORNIA EARLY THIS MORNING. A
CLEAR SLOT WILL PREVAIL BETWEEN THIS SYSTEM AND A SYSTEM EXITING
THE AREA INTO SOUTHWEST/CENTRAL MONTANA THIS MORNING. TEMPERATURES
WILL TREND SLIGHTLY WARMER AND RELATIVE HUMIDITY LOWER TODAY WITH
GUSTY SOUTHWEST WINDS DEVELOPING AROUND NOON. ISOLATED
THUNDERSTORMS ARE EXPECTED TO DEVELOP BY MID-AFTERNOON WITH PEAK
THUNDERSTORM ACTIVITY EXPECTED IN THE EARLY EVENING. THUNDERSTORMS
MAY LINGER INTO EARLY FRIDAY MORNING BEFORE A DRIER AIRMASS PUSHES
IN. DRIER AND COOLER WEATHER WILL PREVAIL ON FRIDAY WITH GUSTY
SOUTHWEST WIND AT RIDGETOP LEVEL.

NOTE: THE NEAREST OBSERVATION SITE USED FOR THIS FORECAST WAS THE
TETON PASS WYDOT SITE...ELEVATION 8463 FEET.

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

FORECASTER...MEUNIER

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY THROUGH EARLY AFTERNOON (20-30 PERCENT).
                    PARTLY CLOUDY (40-50 PERCENT) WITH ISOLATED SHOWERS
                    AND THUNDERSTORMS AFTER 2 PM.
MAX TEMPERATURE.....74-77.
MIN HUMIDITY........24-27 PERCENT.

20 FOOT WINDS.......UPSLOPE/UP VALLEY 5 TO 9 MPH...BECOMING SOUTHWEST 5 TO 10 MPH
                    WITH GUSTS 20 TO 25 MPH IN THE AFTERNOON.  GUSTY AND
                    ERRATIC WINDS NEAR THUNDERSTORMS IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTH TO THE SOUTHWEST 15 TO 20 MPH.

LAL.................1 UNTIL 2 PM...THEN 2.
CHC OF WETTING RAIN.10 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH.

MIXING HEIGHT.......4000-5000 FT AGL INCREASING TO 8200-9200 FT
                    AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 20 TO 25 MPH.
SMOKE DISPERSAL.....GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY IN THE EVENING WITH SCATTERED SHOWERS
                    AND THUNDERSTORMS.  PARTLY CLOUDY AFTER MIDNIGHT
                    WITH ISOLATED SHOWERS AND THUNDERSTORMS.
MIN TEMPERATURE.....46-49.
MAX HUMIDITY........59-62 PERCENT.

20 FOOT WINDS.......SOUTHWEST WINDS AROUND 10 MPH WITH GUSTS UP TO 25 MPH
                    THROUGH 8 PM...BECOMING WEST 5 TO 10 MPH LATE EVENING
                    AND OVERNIGHT. GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS...ESPECIALLY IN THE EVENING.
RIDGE TOP WINDS.....SOUTHWEST 20 TO 25 MPH IN THE EVENING...WEST 15 TO 20 MPH
                    AFTER MIDNIGHT.

LAL.................3 UNTIL 8 PM...THEN 2.
CHC OF WETTING RAIN.20 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

MIXING HEIGHT.......8000-9000 FT AGL DECREASING TO 3500-4500 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST AROUND 25 MPH IN THE EVENING...WEST
                    15 TO 20 MPH AFTER MIDNIGHT.
SMOKE DISPERSAL.....EXCELLENT DECREASING TO FAIR AFTER MIDNIGHT.

.FRIDAY...
SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT).
MAX TEMPERATURE.....68-71.
MIN HUMIDITY........17-20 PERCENT.

20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHWEST
                    AROUND 10 MPH WITH GUSTS 15 TO 20 MPH IN THE AFTERNOON.
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.

MIXING HEIGHT.......4000-5000 FT AGL INCREASING TO 7300-8300 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.
SMOKE DISPERSAL.....FAIR IN THE MORNING...BECOMING VERY GOOD IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...PARTLY CLOUDY. LOWS IN THE MID 40S. WINDS
GENERALLY LESS THAN 10 MPH.

.SATURDAY...MOSTLY CLEAR. LOWS IN THE UPPER 40S. HIGHS IN THE
UPPER 70S. WINDS GENERALLY LESS THAN 10 MPH.

.SUNDAY...MOSTLY CLEAR. LOWS AROUND 50. HIGHS IN THE LOWER 80S.
WINDS GENERALLY LESS THAN 10 MPH.

.MONDAY...MOSTLY CLEAR. LOWS AROUND 50. HIGHS IN THE LOWER 80S.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...JACOB HENRIE
REASON FOR REQUEST...WILDFIRE
.TAG 20130731.SOUTH.01/RIW