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WWUS85 KRIW 122000
SPSRIW

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
200 PM MDT SUN MAY 12 2013

WYZ001>020-022>030-132300-
ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST-
BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS-
EAST SWEETWATER COUNTY-FLAMING GORGE-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS-
NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN-
NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS-
ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES-
SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN-
SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY-
TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN-
UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN-
WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST-
YELLOWSTONE NATIONAL PARK-
200 PM MDT SUN MAY 12 2013

...UNSEASONABLY WARM TEMPERATURES TO OCCUR MONDAY...

HIGH TEMPERATURES IN THE MOUNTAINS MONDAY WILL BE IN THE MID 60S TO
LOWER 70S. MOUNTAIN LOW TEMPERATURES WILL BE IN MID 30S TO MID 40S
MONDAY NIGHT. THEREFORE...MELTING SNOW ABOVE 9000 FEET WILL INCREASE.
IN ADDITION...A GUSTY WEST TO SOUTHWEST WIND OF 25 TO 35 MPH WILL
OCCUR MONDAY INTO MONDAY NIGHT IN THE MOUNTAINS...WHICH WILL INCREASE
SNOWMELT.

WATER LEVELS IN CREEKS AND STREAMS HAVE BEEN RISING DUE TO THE
RECENT WARM TEMPERATURES. THIS WILL CONTINUE MONDAY AND TUESDAY
AS THE SNOWMELT CONTINUES. PEOPLE PLANNING OUTDOOR ACTIVITIES IN
THE HIGH COUNTRY THIS WEEK SHOULD BE PREPARED FOR RISING WATER
LEVELS.

WATER LEVELS USUALLY RISE DURING THE EVENING AND OVERNIGHT HOURS AND
THEN REMAIN STEADY OR RISE AT A SLOWER RATE DURING THE MORNING AND
AFTERNOON HOURS. IN ADDITION...WATER RISES FASTER IN CREEKS AND
STREAMS THAT HAVE A MORE NARROW CHANNEL THAN THOSE WATERWAYS WITH A
WIDER CHANNEL.

AT THIS TIME...FLOODING OF MAJOR CREEKS...STREAMS AND RIVERS IS NOT
EXPECTED. HOWEVER...SMALL STREAMS AND CREEKS IN THE HIGH COUNTRY
DOWNSTREAM OF THE SNOWPACK MAY FLOW OUTSIDE THEIR BANKS AT TIMES.

$$

AR