Flood Potential Outlook
Issued by NWS Cheyenne, WY

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FGUS75 KCYS 061609

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.

Modeate rain is expected to start in southeast Wyoming Fiday 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 dreastically 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 thorugh 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 confidnece grows with precipition
amount forecasts.

Graphical forecasts are available at:
Visit weather.gov/cheyenne and select the rivers & lakes tab for
graphical forecasts and additional information.



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