Special Weather Statement
Issued by NWS Riverton, WY

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WWUS85 KRIW 042152
SPSRIW

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
352 PM MDT FRI SEP 4 2015

WYZ001>020-022>030-051000-
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-CODY FOOTHILLS-
NORTH BIG HORN BASIN-SOUTHWEST BIG HORN BASIN-
SOUTHEAST BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS-
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE-
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-STAR VALLEY-
SALT RIVER AND WYOMING RANGES-UPPER GREEN RIVER BASIN FOOTHILLS-
UPPER GREEN RIVER BASIN-SOUTH LINCOLN COUNTY-
ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-EAST SWEETWATER COUNTY-
INCLUDING THE CITIES OF...CANYON...LAKE...MADISON...MAMMOTH...
OLD FAITHFUL...TOWER JUNCTION...PAHASKA...CODY...POWELL...
LOVELL...GREYBULL...THERMOPOLIS...WORLAND...BUFFALO...KAYCEE...
JACKSON...ATLANTIC CITY...DUBOIS...RIVERTON...LANDER...
JEFFREY CITY...BAIROIL...CASPER...AFTON...ALPINE...
FOSSIL BUTTE NATIONAL MON...PINEDALE...MARBLETON...LA BARGE...
BIG PINEY...EDEN...FARSON...KEMMERER...DIAMONDVILLE...
ROCK SPRINGS...GREEN RIVER...WAMSUTTER...SUPERIOR
352 PM MDT FRI SEP 4 2015

...COOLER WEATHER ON THE WAY LABOR DAY WEEKEND WITH SOME SNOW
POSSIBLE IN NORTHWEST WYOMING...

AN AREA OF LOW PRESSURE WILL TRACK ACROSS THE INTERMOUNTAIN WEST
SATURDAY AND SUNDAY. AFTER A WARM DAY ON SATURDAY...COOLER
TEMPERATURES CAN BE EXPECTED AS THIS WEATHER SYSTEM SWINGS A COLD
FRONT ACROSS THE STATE SATURDAY NIGHT. HIGH TEMPERATURES SUNDAY
WILL BE ABOUT 10 DEGREES BELOW NORMAL...WITH 50S WEST OF THE
CONTINENTAL DIVIDE AND 60S ELSEWHERE. OVERNIGHT LOWS MAY DIP
BELOW FREEZING BOTH SATURDAY NIGHT AND SUNDAY NIGHT IN THE WESTERN
VALLEYS AND BASINS.

THIS WEATHER SYSTEM WILL ALSO GENERATE AN INCREASING CHANCE OF
PRECIPITATION ALONG AND WEST OF THE CONTINENTAL DIVIDE BEGINNING
SATURDAY AFTERNOON AND CONTINUING INTO THE EARLY MORNING HOURS
SUNDAY. THE TIMING OF THE PRECIPITATION SATURDAY NIGHT COULD LEAD
TO SOME SNOW ACROSS NORTHWEST WYOMING...INCLUDING MUCH OF
YELLOWSTONE AND GRAND TETON NATIONAL PARKS. MINOR SNOW
ACCUMULATIONS OF 1 TO 2 INCHES COULD OCCUR ABOVE 9000 FEET ACROSS
NORTHWEST WYOMING...WHILE LITTLE OR NO SNOW ACCUMULATION IS
EXPECTED BELOW 9000 FEET. THE BEST CHANCE OF ACCUMULATING SNOW IN
THE NORTHWEST MOUNTAINS...WILL OCCUR WITH A BURST OF HEAVIER
PRECIPITATION ALONG THE COLD FRONT EARLY SATURDAY EVENING. ALSO
EXPECT STRONG WESTERLY WINDS TO DEVELOP IN WAKE OF THE COLD FRONT.

CONDITIONS WILL BE DRIER AND SLIGHTLY WARMER FOR LABOR DAY. HIGH
TEMPERATURES MONDAY WILL GENERALLY RANGE FROM 65 TO 75. ANY
PRECIPITATION WOULD BE CONFINED TO FAR NORTHWEST WYOMING AND THE
NORTHERN BIGHORN MOUNTAINS...BUT CHANCES LOOK LIMITED.


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