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Hydrologic Outlook

Hydrologic Outlook

Hydrologic Outlook
National Weather Service Billings MT
209 PM MDT Sun May 16 2021

...Warm temperatures to bring increased flows on rivers and

Warm temperatures will increase snowmelt across area mountains
resulting in a significant increase in flows on rivers and streams
by mid week. While flooding is not anticipated on larger rivers,
there is a chance that some smaller streams could reach bankfull in
the foothills, producing minor flooding. At the very least, stream
flows will be much higher and faster with the increased snowmelt.

Rises will first occur on smaller streams flowing out of the
foothills, eventually arriving on larger rivers. 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. Any precipitation will result in
strong and sudden increases. Bank erosion will increase as stream
flows increase, making river banks unstable.

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

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

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
Page last modified: May 16, 2007
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