Montana Hydrologic Outlook - Unknown | Effective 05/29/2026 03:25

ESFTFX 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.