Flood Potential Outlook
Issued by NWS Cheyenne, WY

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FGUS75 KCYS 061641
ESFCYS
WYC001-007-015-081609-

HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1009 AM MDT WED MAY 6 2015

...MODERATE RAIN EXPECTED OVER WATERSHEDS IN SOUTHEAST WYOMING FRIDAY
NIGHT THROUGH SATURDAY NIGHT...

...MINOR FLOODING POSSIBLE ALONG SMALL CREEKS AND STREAMS SATURDAY
AFTERNOON THROUGH SUNDAY AFTERNOON...

ACTIVE SNOWMELT RUNOFF HAS BEEN ONGOING ALONG CREEKS AND RIVERS
ACROSS SOUTHEAST WYOMING FOR OVER A WEEK. RECENT RAINFALL COUPLED
WITH SNOWMELT HAS ALSO INCREASED SOIL MOISTURE ACROSS A MAJORITY OF
WATERSHEDS IN SOUTHEAST WYOMING.

MODERATE RAIN IS EXPECTED TO START IN SOUTHEAST WYOMING FRIDAY NIGHT
AND LAST THROUGH SATURDAY NIGHT.  ONE TO ONE AND A HALF INCHES OF
RAIN IS POSSIBLE ACROSS DRAINAGES WITH ISOLATED AREAS OF TWO INCHES
OF RAIN OVER OROGRAPHICALLY FAVORED WATERSHEDS.  AT THIS TIME, THE
HEAVIEST RAIN IS EXPECTED OVER THE LARAMIE AND MEDICINE BOW
WATERSHEDS.

RAINFALL RUNOFF COUPLED WITH SNOWMELT RUNOFF AND SATURATED SOILS
WILL ALLOW SMALL CREEKS AND STREAMS ACROSS SOUTHEAST WYOMING TO FLOW
AT HIGH LEVELS BEGINNING SATURDAY AFTERNOON. MINOR FLOODING IS
POSSIBLE ALONG SMALL STREAMS AND CREEKS SATURDAY AFTERNOON THROUGH
SUNDAY AFTERNOON.

SNOW LEVELS ON FRIDAY NIGHT THROUGH SATURDAY MORNING ARE EXPECTED TO
BE 7500 TO 8500 FEET, DROPPING TO 5500 FEET BY EARLY SUNDAY MORNING.
 ACTIVE SNOWMELT RUNOFF AND RAINFALL RUNOFF WILL DRASTICALLY SLOW
DOWN BY EARLY SUNDAY MORNING.

LOCAL RAINFALL RUNOFF COULD CAUSE TO THE LARAMIE RIVER AT LARAMIE TO
RISE TO NEAR BANKFULL CONDITIONS BY SATURDAY NIGHT. MINOR FLOODING
IS POSSIBLE WITH BANKFULL CONDITIONS ALONG THE LARAMIE RIVER.  THE
RIVER MAY SLOWLY RECEDE SUNDAY AFTERNOON THROUGH EARLY MONDAY. A
SECOND RISE IN THE RIVER EXPECTED BY TUESDAY AS RAINFALL RUNOFF FROM
THE UPPER PORTIONS OF THE BASIN MAKE IT DOWN TO THE LARAMIE RIVER AT
LARAMIE.

STAY TUNED FOR FLOOD WATCHES,ADVISORIES AND EVEN WARNINGS AS
CONFIDENCE GROWS WITH PRECIPITATION AMOUNT FORECASTS.

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


$$

JTFAHEY


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