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Hydrologic Outlook

Hydrologic Outlook

Hydrologic Outlook
National Weather Service Glasgow MT
1248 PM MDT Fri May 25 2018

...The Yellowstone is On The Rise...

The Yellowstone River is expected to rise through next week from
Miles City through Sidney. Levels may reach Flood Stage at
Glendive about Friday June 1st and approach Flood Stage at Sidney
Friday or Saturday.

Persons with interests along the Yellowstone River may want to
prepare for the rising levels through the end of next week.



Hydrologic Outlook
Hydrologic Outlook
National Weather Service Riverton WY
946 AM MDT Fri May 25 2018

...A combination of snowmelt and rainfall runoff will cause sharp increases
in creek and river levels Sunday through Tuesday...

...Creeks and streams will remain at high levels through late next week...

Increased snowmelt at the 9,000 to 10,000 foot elevation through
Saturday will be followed by widespread mountain rain showers on Sunday.
At this time, precipitation totals look to the highest across the Big
Horn Mountains.

The combination of rain and snowmelt runoff will further
increase already high creek and river levels. The Wind River and the
North/South Forks of the Shoshone River should see the highest flows of the
runoff season by Monday and Tuesday of next week. Tributary streams that
feed into the Big Horn, Powder, and Snake Rivers may also see the highest
flows of the season by early next week.

Flooding is expected along the Wind River, South Fork of the Shoshone
River, and the Gros Ventre River.  Tributaries creeks and streams along both
sides of the Big Horn Mountains should also have very high river levels to
cause flooding.

Mountain temperatures will remain above normal through the remainder
of next week.  This will cause creeks streams to remain at high
levels through late next week.

During active snowmelt runoff, mountain creeks and streams are
at their highest levels during the late afternoon/early evening
hours.  Crossing creeks and streams during that time is highly

Stay tuned for any watches and/or warnings that will be issued with
this rain on snowmelt event.

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


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