FNUS75 KRIW 090849
FWSRIW

SPOT FORECAST FOR SNAKE FIRE...NPS
NATIONAL WEATHER SERVICE RIVERTON WY
249 AM MDT FRI AUG 9 2013

FORECAST IS BASED ON REQUEST TIME OF 2125 MDT ON AUGUST 08.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

CONTINUED INCREASES IN MOISTURE WILL RAISE BOTH CLOUD COVER AND
CHANCES FOR SHOWERS AND THUNDERSTORMS TODAY AS A WEAK
UPPER LEVEL DISTURBANCE ROTATES OVER THE REGION. HIGH TEMPERATURES
WILL DECREASE ANOTHER DEGREE OR TWO TODAY WITH MINIMUM RH VALUES
REMAINING AT OR ABOVE 20 PERCENT. SHOWERS OR THUNDERSTORMS WILL BE
POSSIBLE BY SUNRISE...WITH CHANCES INCREASING THROUGH THE DAY
...THEN MOSTLY ENDING IN THE EVENING. STORM MOVEMENT WILL BE FROM
THE SOUTH TO SOUTHWEST WITH SOME THUNDERSTORMS PRODUCING BRIEF
HEAVY RAIN AND ERRATIC WINDS WITH GUSTS 30 - 40 MPH. MOST SHOWERS
OR STORMS...HOWEVER...WILL PRODUCE LESS THAN ONE TENTH OF AN INCH
PRECIPITATION.

SATURDAY...CHANCES WILL ONCE AGAIN EXIST FOR SHOWERS OR
THUNDERSTORMS...BUT TO A LESSER DEGREE THAN TODAY AS THE
ATMOSPHERE BEGINS TO DRY OUT. RAINFALL POTENTIAL WITH THESE
SHOWERS OR THUNDERSTORMS WILL BE LESS THAN .05 INCH.

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

FORECASTER...BRAUN

.TODAY...
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). ISOLATED RAIN
                    SHOWERS THROUGH THE DAY. ISOLATED THUNDERSTORMS
                    IN THE LATE MORNING AND AFTERNOON.
MAX TEMPERATURE.....72-75.
MIN HUMIDITY........21-24 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 3-8 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....SOUTHWEST 5 TO 10 MPH.
LAL.................1 UNTIL 0900 THEN 2.
CHC OF WETTING RAIN.15 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......2500-3500 FT AGL INCREASING TO 8200-9200 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 15 TO 20 MPH.
SMOKE DISPERSAL.....FAIR (47400 KNOT-FT) INCREASING TO VERY GOOD
                    (124700 KNOT-FT) IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). ISOLATED
                    THUNDERSTORMS IN THE EVENING. ISOLATED RAIN
                    SHOWERS UNTIL EARLY MORNING. ISOLATED
                    THUNDERSTORMS AFTER MIDNIGHT.
MIN TEMPERATURE.....40-43.
MAX HUMIDITY........75-78 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 5-10 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....SOUTH TO SOUTHWEST 10 TO 15 MPH.
LAL.................2 UNTIL 0300...THEN 1.
CHC OF WETTING RAIN.8 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......5400-6400 FT AGL DECREASING TO 200-700 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST AROUND 16 MPH SHIFTING TO THE
                    SOUTHEAST 14 TO 15 MPH IN THE LATE EVENING AND
                    OVERNIGHT.
SMOKE DISPERSAL.....GOOD (84700 KNOT-FT) DECREASING TO POOR (5700
                    KNOT-FT) AFTER MIDNIGHT.

.SATURDAY...
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT). SLIGHT CHANCE OF
                    SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....70-75.
MIN HUMIDITY........20-25 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-10 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....SOUTHEAST 5 TO 10 MPH SHIFTING TO THE SOUTHWEST
                    IN THE AFTERNOON.
LAL.................1 UNTIL 1200...THEN 2.
CHC OF WETTING RAIN.10 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3700-4700 FT AGL INCREASING TO 9400-10400 FT
                    AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHEAST 12 TO 15 MPH SHIFTING TO THE
                    SOUTHWEST AROUND 15 MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....FAIR (41100 KNOT-FT) INCREASING TO VERY GOOD
                    (112200 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...PARTLY CLOUDY. LOWS IN THE LOWER 40S. WINDS
GENERALLY LESS THAN 10 MPH.
.SUNDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 40S. HIGHS IN THE UPPER 70S. WINDS
GENERALLY LESS THAN 10 MPH.
.MONDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE MID
70S. WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE MID
70S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...BRAUN
REQUESTED BY...BECKY SMITH
REASON FOR REQUEST...WILDFIRE
.TAG 20130808.SNAKE.01/RIW