Hydrologic Outlook
MTC013-015-035-041-045-049-051-059-073-099-101-300000-

Hydrologic Outlook
National Weather Service Great Falls MT
425 AM MDT Fri May 29 2026

What: Widespread heavy rainfall Saturday into Monday.

Where: Mostly the western portion of North Central MT.

Timing: The heavier rainfall will begin on Saturday and then
diminish on Monday. Rainfall rates of around 0.50 to 0.75 are
possible every 6 hours over a 36 hour period.

Relevant factors: Overall, total precipitation amounts for most
areas will range from 1 to 2 inches. About 10 percent of the area
will receive closer to 3 inches of rainfall.

In terms of flooding, given the recent dry period, most of the area
will be handle the first few inches of rainfall. However, areas that
receive 3 or more inches of rainfall could start to have impacts.

Additionally, there is still a minor snowpack left in the mountains
that could add to runoff concerns as the remaining snow washes out.

Thus some flood statements might be needed later this weekend should
flooding develop over the Plains or along rivers.

Everyone is reminded that should flooding develop, regardless if the
roadway is paved or not, do not drive through any flood waters, as
you do not know if the road has been washed out under the flood
waters.

Please monitor the National Weather Service or the local media this
weekend for further updates on this spring storm.
$$

Brusda

Hydrologic Outlook
MTC023-029-039-047-063-077-081-093-291800-

Hydrologic Outlook
National Weather Service Missoula MT
151 PM MDT Thu May 28 2026

 What: Widespread Moderate to Heavy Precipitation

 Where: Western Montana Counties: Flathead, Lake, Missoula, Powell,
 Granite, Ravalli, Deer Lodge, and Silver Bow

 Timing: Saturday May 30 through Monday June 1, 2026

 Relevant factors:
        Total precipitation amounts of 1 to 3 inches with locally
        higher amounts possible in higher terrain along the divide.
        Ongoing snowmelt and recent precipitation has kept stream and
        river levels rising. Anticipate further rises in local
        waterways, rockfall and mudslide potential in steep terrain,
        as well as possible urban and low-land flooding.

 The Clark Fork River near Missoula is currently forecast to reach
 near 8 feet by Monday afternoon, June 1.

 The Flathead River near Columbia Falls is currently forecast to
 reach near 14 feet by Tuesday night, June 2.

 Additional information will be provided at or before Noon MDT on May
 29th.


$$