Hydrologic Outlook issued May 13 at 1:45PM MDT by NWS Billings MT

ESFBYZ

Recent warm temperatures and increased snowmelt have area rivers and
streams running high. While decreasing temperatures will bring an
end to most of the snowmelt in the mountains, widespread
precipitation is expected into Thursday. Snow is expected to fall
above 7000 feet, with periods of showers and weak thunderstorms
bringing between 0.5 to 2.0 inches of rainfall over the lower
elevations and foothills.

Rivers and streams will remain high, and additional rises are
possible due to the expected precipitation. While widespread
flooding of rivers and streams is not expected, localized minor
flooding impacts are possible. Please continue to monitor the
forecast over the coming days.

The continued high water will increase erosion, making streambanks
unstable. Please stay well away from streambanks when water is
running fast, and be especially vigilant with children. Erosion will
undercut the bank and can break off taking the bank and anyone
standing on it into a very cold raging current. For those planning
recreation activities on or near waterways, be prepared for changing
conditions and higher flows.

Stay tuned to the forecast for any watches, advisories, or warnings.
Please report any flooding to local law enforcement and have them
relay the report to the National Weather Service.