Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

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Last Map Update: Fri, Sep 18, 2026 at 8:26:28 am MDT

Watches, Warnings & Advisories

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National Weather Service Great Falls, MT

Flash Flood Watch

Flood Watch

Showers & Thunderstorms Friday

Numerous showers and thunderstorms will develop Friday over the Northern Rockies, especially I-90 southward. These storms will come with brief heavy rainfall, frequent lightning, gusty winds and small hail as southerly flow transports monsoon moisture from the southwestern states into the area. Locally heavy rain causing debris flows/local runoff issues is a particular concern near burn scars and other susceptible areas.