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Hydrologic Outlook

HYDROLOGIC OUTLOOK
WYC013-060801-

HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
201 PM MDT WED MAY 4 2016

...RAPID RISES IN SMALL STREAMS AND CREEKS POSSIBLE OVER THE WIND RIVER BASIN
SATURDAY AFTERNOON THROUGH MONDAY MORNING...

RAINFALL WILL START ACROSS THE WIND RIVER BASIN BY FRIDAY AFTERNOON AND INCREASE
IN INTENSITY BY SATURDAY AFTERNOON.  RAINFALL, HEAVY AT TIMES, WILL CONTINUE
THROUGH SUNDAY MORNING. TOTAL RAINFALL AMOUNTS THROUGH SUNDAY NIGHT ARE FORECASTED
TO BE 2 AND A HALF TO 3 INCHES WITH ISOLATED AREAS IN THE MOUNTAINS AT 3 AND A
HALF TO 4 INCHES.

SNOW LEVELS WITH THIS EVENT WILL START OUT AT 9500 FEET FRIDAY AFTERNOON THROUGH
SATURDAY AFTERNOON; DROPPING TO 8000 FEET BY SUNDAY NIGHT.

THE FIRST ACTIVE SNOWMELT CYCLE OVER THE MOUNTAIN STREAMS AND CREEKS ALONG THE
WIND RIVER BASIN BEGAN TUESDAY AFTERNOON.  ACTIVE SNOWMELT RUNOFF WILL CONTINUE
THROUGH FRIDAY AFTERNOON AND TAPER OFF BY SATURDAY.  RAINFALL RUNOFF AND
SNOWMELT RUNOFF WILL COMBINE FORCES SATURDAY AFTERNOON TO CAUSE RAPID RISES
ALONG SMALL STREAMS AND CREEKS ALONG THE LOWER ELEVATIONS OF THE WIND RIVER BASIN.
SMALL STREAM AND CREEKS ARE EXPECTED TO RUN AT HIGH LEVELS THROUGH MONDAY MORNING.

THE LITTLE WIND RIVER NEAR RIVERTON IS EXPECTED TO RISE STEADILY AND EXPECTED TO
CREST NEAR FLOOD STAGE BY LATE MONDAY NIGHT.  THE WIND RIVER IS EXPECTED TO CREST
BELOW FLOOD STAGE BY LATE MONDAY NIGHT THROUGH EARLY TUESDAY MORNING.

STAY TUNED FOR UPDATED FORECASTS, WATCHES, AND POSSIBLE WARNINGS WITH THIS
EVENT. REMEMBER, WITH ACTIVE SNOWMELT RUNOFF, STREAMS AND CREEKS WILL BE HIGHEST
DURING THE LATE AFTERNOON AND EARLY MORNING HOURS. AVOID ANY TYPE OF STREAM
CROSSINGS DURING THOSE TIMES.

GRAPHICAL FORECASTS ARE AVAILABLE AT:
HTTP://WATER.WEATHER.GOV/AHPS2/INDEX.PHP?WFO=RIW
VISIT WEATHER.GOV/RIVERTON AND SELECT THE RIVERS & LAKES TAB FOR
GRAPHICAL FORECASTS AND ADDITIONAL INFORMATION.

$$
JTFAHEY




Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
152 PM MDT THU MAY 5 2016

WYZ001>020-022>030-061300-
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-
152 PM MDT THU MAY 5 2016

...FLOOD WATCH LANDER FOOTHILLS AND WIND RIVER BASIN SATURDAY
THROUGH SUNDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS WEST OF THE DIVIDE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

FRIDAY...ISOLATED TO SCATTERED AFTERNOON AND EVENING
THUNDERSTORMS. A FEW STRONG THUNDERSTORMS POSSIBLE.

FRIDAY NIGHT TO SATURDAY NIGHT...RAIN SHOWERS INCREASING ACROSS
THE AREA WITH SNOW LEVELS EXPECTED TO BE 9000 FEET OR HIGHER.
HEAVY RAIN POSSIBLE ON MOUNTAIN SNOWPACK THAT MAY ELEVATE FLOODING
CONCERNS. SNOW LEVELS MAY LOWER TO 8000 TO 8500 FEET SATURDAY
NIGHT. SEE THE FLASH FLOOD WATCH STATEMENT FOR MORE DETAILS ON
POTENTIAL FLOODING OF SMALL STREAMS AND CREEKS IN THE LANDER
FOOTHILLS AND WIND RIVER BASIN.

SUNDAY...LINGERING RAIN SHOWERS EAST OF THE DIVIDE WITH LESSER
COVERAGE WEST.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE URGED TO REPORT HAIL OR WIND GUSTS OVER 45 MPH.

$$




Flood Watch

FLOOD WATCH
NATIONAL WEATHER SERVICE RIVERTON WY
138 PM MDT THU MAY 5 2016

...HEAVY RAIN FRIDAY NIGHT THROUGH SATURDAY AFTERNOON MAY CAUSE
FLOODING OF SMALL STREAMS AND CREEKS ALONG THE LANDER FOOTHILLS
AND ACROSS THE SOUTHERN END OF THE WIND RIVER BASIN...

.RAINFALL WILL START ACROSS THE SOUTHERN HALF OF THE WIND RIVER
BASIN AND ALONG THE LANDER FOOTHILLS BY FRIDAY AFTERNOON AND
INCREASE IN INTENSITY BY SATURDAY MORNING. RAINFALL, HEAVY AT
TIMES, WILL CONTINUE THROUGH SATURDAY NIGHT. TOTAL RAINFALL
AMOUNTS THROUGH SUNDAY MORNING ARE FORECASTED TO BE 2 TO 3 INCHES
WITH ISOLATED AREAS ALONG THE LANDER FOOTHILLS OF UP TO 4 INCHES.

SNOW LEVELS WITH THIS EVENT WILL START OUT AT 9000 TO 9500 FEET
FRIDAY AFTERNOON THROUGH SATURDAY AFTERNOON; DROPPING TO AROUND
8000 FEET BY SUNDAY MORNING.

RAINFALL RUNOFF AND SNOWMELT RUNOFF WILL COMBINE FORCES SATURDAY
MORNING TO CAUSE RAPID RISES OF SMALL STREAMS AND CREEKS ALONG THE
LANDER FOOTHILLS AS WELL ALONG THE LOWER ELEVATIONS OF THE
SOUTHERN WIND RIVER BASIN. SMALL STREAMS AND CREEKS ARE EXPECTED
TO RUN AT HIGH LEVELS THROUGH SUNDAY MORNING.

WYZ017-018-061945-
/O.NEW.KRIW.FA.A.0001.160507T1200Z-160509T0000Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WIND RIVER BASIN-LANDER FOOTHILLS-
INCLUDING THE CITIES OF...RIVERTON...SHOSHONI...LANDER
138 PM MDT THU MAY 5 2016

...FLOOD WATCH IN EFFECT FROM SATURDAY MORNING THROUGH SUNDAY
AFTERNOON...

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* FLOOD WATCH FOR A PORTION OF CENTRAL WYOMING...INCLUDING THE
  FOLLOWING AREAS...LANDER FOOTHILLS AND WIND RIVER BASIN.

* FROM SATURDAY MORNING THROUGH SUNDAY AFTERNOON

* HEAVY RAIN LEADING TO EXCESSIVE RAINFALL AND SNOWMELT RUNOFF
  WILL CAUSE RAPID RISES IN SMALL CREEKS AND STREAMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON
CURRENT FORECASTS.

YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE
FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE
PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP.

&&

$$
JTFAHEY




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