Suppression Forecast
Issued by NWS Riverton, WY

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000
FNUS75 KRIW 252158
FWSRIW

SPOT FORECAST FOR SIMPSON...USFS SHF
NATIONAL WEATHER SERVICE RIVERTON WY
358 PM MDT THU AUG 25 2016

FORECAST IS BASED ON REQUEST TIME OF 1513 MDT ON AUGUST 25.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...FIRE CONDITIONS WILL REMAIN BELOW CRITICAL THROUGH FRIDAY.
A COUPLE OF UPPER LEVEL DISTURBANCES MOVING THROUGH THE AREA WILL KEEP COOL
TEMPERATURES AND HIGHER RELATIVE HUMIDITY ACROSS THE AREA. ISOLATED
TO WIDELY SCATTERED THUNDERSTORMS WILL BE AROUND FOR THE REST OF THIS
AFTERNOON AND EVENING AS WELL AS ON FRIDAY, BUT MORE PRECIPITATION SHOULD
FALL FROM ANY THUNDERSTORMS TODAY. FIRE DANGER WILL INCREASE AGAIN OVER
THE WEEKEND WITH WARMER TEMPERATURES AND LOWER HUMIDITY RETURNING.

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

FORECASTER...LIPSON

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (50-60 PERCENT). THUNDERSTORMS
                    WILL BE OCCUR OVER THE VICINITY OF THE FIRE
                    THROUGH ABOUT 1900 EARLY THIS EVENING, WITH ONLY ISOLATED
                    SHOWER ACTIVITY THERE AFTER. SOME WET SNOW COULD
                    BE MIXED IN WITH ANY SHOWERS AFTER MIDNIGHT.
MIN TEMPERATURE.....32-35.
MAX HUMIDITY........83-86 PERCENT.
20 FOOT WINDS.......SOUTH WINDS AROUND 8 MPH WITH GUSTS TO AROUND 15
                    MPH EARLY IN THE EVENING BECOMING
                    DOWNSLOPE/DOWNVALLEY 4-7 MPH...THEN BECOMING
                    SOUTH AROUND 9 MPH WITH GUSTS TO AROUND 15
                    MPH LATE IN THE NIGHT. GUSTY AND ERRATIC WINDS
                    EXPECTED NEAR THUNDERSTORMS IN THE EVENING.
RIDGE TOP WINDS.....SOUTHWEST AROUND 15 MPH SHIFTING TO THE SOUTHEAST IN
                    THE LATE EVENING AND EARLY MORNING...THEN
                    SHIFTING TO THE SOUTHWEST LATE IN THE NIGHT.
LAL.................4 UNTIL 2400...THEN 1.
CHC OF WETTING RAIN.10 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......5500 FT AGL DECREASING TO 600 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....WEST AROUND 18 MPH SHIFTING TO THE SOUTH 9 TO
                    16 MPH IN THE LATE EVENING AND OVERNIGHT.
SMOKE DISPERSAL.....POOR (5900-21600 KNOT-FT).

.FRIDAY...

SKY/WEATHER.........PARTLY CLOUDY (50-60 PERCENT). ISOLATED RAIN
                    SHOWERS LATE IN THE MORNING. SCATTERED SHOWERS
                    AND THUNDERSTORMS IN THE AFTERNOON AFTER 1500.
MAX TEMPERATURE.....50-53.
MIN HUMIDITY........37-42 PERCENT.
20 FOOT WINDS.......SOUTH WINDS AROUND 11 MPH EARLY IN THE
                    MORNING BECOMING UPSLOPE/UPVALLEY 5-9
                    MPH...THEN BECOMING SOUTHWEST AROUND 10 MPH LATE IN
                    THE AFTERNOON. GUSTS UP TO 20 MPH. GUSTY AND
                    ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN
                    THE AFTERNOON.
RIDGE TOP WINDS.....WEST 15 TO 20 MPH.
LAL.................1 UNTIL 1200...THEN 4.
CHC OF WETTING RAIN.7 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......500 FT AGL THEN 10000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 17 TO 21 MPH.
SMOKE DISPERSAL.....POOR (4400 KNOT-FT) INCREASING TO EXCELLENT
                    (170100 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...
PARTLY CLOUDY. ISOLATED SHOWERS...THUNDERSTORMS AND SNOW SHOWERS
IN THE EVENING. LOWS IN THE LOWER 30S. WINDS GENERALLY LESS THAN
10 MPH.
.SATURDAY...
MOSTLY CLEAR. LOWS IN THE LOWER 30S. HIGHS AROUND 60. WEST WINDS
AROUND 12 MPH.
.SUNDAY...
MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE MID 60S. WEST
WINDS AROUND 11 MPH.
.MONDAY...
MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE LOWER 60S.
WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...
PARTLY CLOUDY. LOWS IN THE LOWER 40S. HIGHS IN THE LOWER 60S.
WINDS GENERALLY LESS THAN 10 MPH.

$$
FORECASTER...LIPSON
REQUESTED BY...SHANNON MYERS
TYPE OF REQUEST...WILDFIRE
.TAG 20160825.SIMPS.01/RIW



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