Flood Potential Outlook
Issued by NWS Billings, MT

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FGUS75 KBYZ 251708
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MTC003-011-017-025-065-075-087-103-111-WYC033-271715-

HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
1108 AM MDT Sun Mar 25 2018

The potential for ice jams and overland snow melt flooding will
continue this week, mainly east of a Roundup to Hardin to Sheridan
Wyoming line.

Temperatures are expected to be below average for most of the
week, with the warmest day being Tuesday with highs around 50
degrees. The weather pattern this week looks unsettled with
periods of rain/snow showers across the region. The combination of
below average temperatures and cloud cover should keep snow melt
at a moderate pace. Precipitation potential of half an inch to an
inch exists for the next week to ten days which may cause
additional impacts, so stay current with the forecast for details
in your area.

Snow melt is causing culverts to overflow in many areas, pushing
water over roadways at times. Water is also accumulating in low
lying areas, especially where the ground remains frozen. Expect
this trend to continue through the week, mainly in the afternoon
and evening hours. Drivers should obey posted road signs, and if
safety can not be assured turn around and take an alternate
route.

Rivers remain ice covered in many areas, mainly from Rosebud
county eastward. Ice jam flooding was reported in the past week
on several waterways including the Powder and Musselshell rivers.
As the ice continues to break up on rivers such as the Yellowstone
and Tongue, will expect to see additional ice jam development
over the next week or two. Smaller streams can also experience ice
jam flooding including Rosebud, Otter and Pumpkin creeks.

Those with interests along still ice covered waterways should
move livestock and equipment to higher ground and be alert for
rapidly rising water. Have a plan to get to higher ground if
flooding does develop, especially if it develops overnight.
Remember that ice jam flooding can develop suddenly, with water
levels rising several feet in just a few minutes.

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