National Weather Service United States Department of Commerce

Heavy Rain and Flash Flooding Threat in Montana; Severe Thunderstorms in the Middle Missouri Valley

A low pressure system will bring heavy to excessive rainfall and high winds across Montana this afternoon. Heavy rainfall totals may lead to scattered flash flooding concerns. A line of showers and strong to severe thunderstorms will move into the mid Missouri Valley region this afternoon producing severe winds and isolated large hail with stronger storms. Read More >

Explanation of Color Codes used in the tables.
Green indicates little to no impact to aviation operations, such as VFR Conditions
Blue indicates operations may be impacted, such as during MVFR conditions.
Red indicates a major impact, such as IFR conditions.
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The following table shows the thresholds for each.

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