Flood Potential Outlook
Issued by NWS Riverton, WY

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FGUS75 KRIW 181431
Hydrologic Outlook
National Weather Service Riverton WY
731 AM MST Sun Feb 18 2018

...Ice jam flooding possible along Big Horn and Shoshone
Rivers during the middle to late next week...

The main channels of the Big Horn and Shoshone Rivers are
expected to completely freeze by the middle of next week.
The thickness of the ice will be noticeably greater by next
week as well.

Fluctuations in basin temperatures throughout next week will
cause ice in rivers to alternatively freeze and thaw. As the
river ice thaws, thick slabs of ice will begin to move downstream.
The slabs of ice may eventually dam up--especially near man-made
obstructions like bridges and irrigation head gates. Sharp bends in
the river are also areas that moving slabs of ice may pile up and
cause elevated river levels.

Cities and towns along the Big Horn and Shoshone Rivers that could
have problems with flooding due to ice jams include Worland,
Manderson, Greybull, and Lovell.

River ice is very unpredictable, and may move and jam with little
notice. Any ice jam can cause flooding, as the ice dams the river,
causing rapid increases in river levels in a short period of time.

People living near the Big Horn and Shoshone Rivers should monitor
the situation closely By next week and be ready to move to higher
ground if flooding occurs.

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

Team Riverton

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