Flood Potential Outlook
Issued by NWS Cheyenne, WY

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FGUS75 KCYS 181726

Hydrologic Outlook
National Weather Service Cheyenne WY
1125 AM MDT Mon May 18 2020

...Higher Flows Along Some Southeast Wyoming Rivers, Creeks and
Streams This Week Due to Snowmelt Runoff and Rain on Snowmelt...

Snowpack at the 8,500 to 9,500 foot elevation is water laden and has
been melting at steady rate for the past two weeks. Several creeks
and streams running out of the Sierra Madre and Snowy mountains have
been flowing at moderate levels for the past two weeks.

Afternoon temperatures at the 9,000 foot elevation are forecast to
warm into the 60s today and Tuesday. Overnight low temperatures are
forecast to remain above the frost temperature of 37 degrees Tuesday
and Wednesday. Isolated to scattered showers and thunderstorms are
forecast Tuesday and Wednesday over the Snowy and Laramie Ranges.

The combination of rain falling on a melting snowpack will result in
higher flows along creeks and streams this week. Higher flows along
the Little Snake River from Dixon to Baggs should cause the river to
rise, but remain below flood stage this week. Bankfull or higher
water levels are expected along the North Platte River at Saratoga
and Sinclair, and along the Laramie River at Laramie. Higher flows
are also expected along the Boxelder and Deer Creeks later this

Remember, during active snowmelt runoff, mountain creeks flow the
highest during the late afternoon through early morning hours. Do
not attempt to cross a fast flowing creek or stream during these
times as the force of water can easily carry you downstream.


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