Hydrologic Outlook issued May 9 at 3:54PM MDT by NWS Billings MT

ESFBYZ

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

Water rises will occur first on small streams flowing out of the
foothills, eventually arriving on larger rivers and streams. The
rate and magnitude 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 may also result
in strong and sudden water rises.

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 stream bank
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.

Erosion will also increase as stream flows increase, 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.

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.