Suppression Forecast
Issued by NWS Riverton, WY

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000
FNUS75 KRIW 101654
FWSRIW

SPOT FORECAST FOR NORTH HWY 89 ROAD CLOSURE...GRAND TETON NATIONAL PARK
NATIONAL WEATHER SERVICE RIVERTON WY
954 AM MST TUE JAN 10 2017

FORECAST IS BASED ON INCIDENT TIME OF 1000 MST ON JANUARY 10.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...WINTER STORM WARNING IN EFFECT UNTIL 5 AM MST THURSDAY...

.DISCUSSION...

DEEP PACIFIC WINTER WEATHER SYSTEM WILL CONTINUE TO PUMP MOISTURE
INTO THE AREA TODAY THROUGH WEDNESDAY NIGHT. MODERATE TO OCCASIONALLY
HEAVY SNOW TODAY WILL GIVE WAY TO MAINLY HEAVY SNOW TONIGHT...VERY
HEAVY BETWEEN 9PM AND 3AM...CONTINUING HEAVY THROUGH AT LEAST WEDNESDAY
MORNING. THEN...FROM WEDNESDAY AFTERNOON THROUGH THE EVENING...SNOW RATES
WILL BEGIN TO SLOWLY TAPER OFF...BECOMING LIGHT SNOW SHOWERS OR FLURRIES
BY MIDNIGHT WEDNESDAY. EXPECT ANOTHER 1 TO 3 INCHES THOUGH TODAY...6 TO 12
INCHES TONIGHT...3 TO 6 THROUGH WEDNESDAY MORNING...FOLLOWED AND ENDING
WITH A FINAL 2 TO 4 INCHES FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY NIGHT.
WINDS AT TIMES...ESPECIALLY ACROSS THE HIGHER ELEVATIONS...WILL GUST OUT
OF THE SOUTHWEST 35 TO 45 MPH. ALL WINDWARD SLOPES WILL THEN BE FAVORED
LOCATIONS FOR HEAVIER SNOW.

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

FORECASTER...BRAUN

.TODAY...

SKY/WEATHER.........CLOUDY (90-100 PERCENT). SNOW.
MAX TEMPERATURE.....23-28.
MIN HUMIDITY........70-75 PERCENT.
20-FOOT WINDS.......SOUTHWEST WINDS 12 TO 23 MPH. GUSTS UP TO 35
                    MPH INCREASING TO 45 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 25 TO 30 MPH.
CHC OF WETTING RAIN.90 PERCENT.

.TONIGHT...

SKY/WEATHER.........CLOUDY (90-100 PERCENT). HEAVY SNOW.
MIN TEMPERATURE.....AROUND 18-23.
MAX HUMIDITY........90-95 PERCENT.
20-FOOT WINDS.......SOUTHWEST WINDS 16 TO 23 MPH WITH GUSTS TO
                    AROUND 45 MPH.
RIDGE TOP WINDS.....SOUTHWEST 25 TO 30 MPH.
CHC OF WETTING RAIN.100 PERCENT.

.WEDNESDAY...

SKY/WEATHER.........CLOUDY (95-100 PERCENT). HEAVY SNOW.
MAX TEMPERATURE.....22-27.
MIN HUMIDITY........75-80 PERCENT.
20-FOOT WINDS.......SOUTHWEST WINDS 15 TO 17 MPH WITH GUSTS TO
                    AROUND 30 MPH.
RIDGE TOP WINDS.....SOUTHWEST 20 TO 25 MPH.
CHC OF WETTING RAIN.100 PERCENT.

.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY NIGHT...
COLDER...SNOW. LOWS AROUND 8. SOUTH WINDS AROUND 13 MPH.
.THURSDAY...
PARTLY CLOUDY. SLIGHT CHANCE OF SNOW. LOWS AROUND 8. HIGHS AROUND
18. WINDS GENERALLY LESS THAN 10 MPH.
.FRIDAY...
MOSTLY CLEAR. LOWS AROUND 10 BELOW. HIGHS AROUND 16. WINDS
GENERALLY LESS THAN 10 MPH.
.SATURDAY...
PARTLY CLOUDY. LOWS AROUND 14 BELOW. HIGHS AROUND 16. WINDS
GENERALLY LESS THAN 10 MPH.

$$
FORECASTER...BRAUN
REQUESTED BY...HEATHER VOSTER
TYPE OF REQUEST...OTHER
.TAG 1700230.0/RIW
.EMAIL HEATHER_VOSTER@NPS.GOV



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