Flood Potential Outlook
Issued by NWS Great Falls, MT

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FGUS75 KTFX 230915

Hydrologic Outlook
National Weather Service Great Falls MT
315 AM MDT Wed May 23 2018

...Flooding concerns to increase this week due to mountain
snowmelt and runoff from showers...

River and creek levels will likely rise once again throughout this
week, causing an increased concern for flooding across portions of
north central and southwest Montana adjacent to mountains.

Temperatures will remain well above normal for this time of year,
which will increase melting of the still substantial snowpack at
higher elevations of the mountains. The weather pattern will also
be quite active, and the potential for brief heavy rain showers
from thunderstorms could create periods of rapid runoff.

This additional water going into area rivers and creeks will keep
them running at least high, fast, and very cold, especially near
mountains. Water could flow out of their banks and cause flooding
of fields and low-lying areas.

Some river gauge points have already reached flood stage, but
additional locations may approach or exceed flood stage
throughout this week. These additional locations include, but are
not limited to:

In southwest Montana:
Jefferson River at Twin Bridges...
Gallatin River at Logan...
Missouri River at Toston...
Tenmile Creek near Helena...

In north central Montana:
Sun River near both Simms and Vaughn...
Badger Creek near Browning...

Please continue to monitor future flood statements for updates on
this ever-changing situation. Also, please have a plan-of-action
for long-term rises on rivers and streams through the remainder
of May, and into June as well.


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