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Hydrologic Outlook

Hydrologic Outlook

Hydrologic Outlook
National Weather Service Billings MT
918 AM MDT Fri May 14 2021

...Warm temperatures into the 80s to bring increased flows on rivers
and streams next week...

Warm temperatures into the 80s early next week are expected to
increase snowmelt across area mountains resulting in an increase in
flows on area rivers and streams. While flooding is not anticipated,
at the very least streamflows will be much higher and faster with
the increased snowmelt.

Water rises will occur first on small streams and creeks flowing out
of the foothills, eventually arriving on larger rivers and streams.
The rate and strength of the water rises will be determined by how
warm temperatures get over the mountains as well as whether
temperatures remain above freezing overnight. Erosion will also
increase as stream flows increase, making streambanks unstable.

For those living near waterways, this may be the last chance to
finalize preparations for runoff season. Move any livestock and
equipment to higher ground away from waterways. Any streambank
stabilization activities should be completed as soon as possible.
For those planning recreation activities on or near waterways, be
prepared for changing conditions and significantly higher flows.

Stay tuned to the forecast. Please report any flooding to local law
enforcement and have them relay the report to the National Weather


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