NWS Forecast Office Great Falls, MT

Showers and even a few isolated thunderstorms are likely on Sunday over the Central Montana Lakes of Canyon Ferry, Upper/Lower Holter, Hauser, and Lake Helena. High temperatures will be below normal and in the upper 50s to around 60 degrees. Thunderstorms on Sunday could produce gusty and erratic winds.

There is the potential for heavy rain later tonight through Sunday, which could cause minor flooding to develop along portions of the Dearborn River on Sunday. Continue to monitor for further updates on our Facebook page, Twitter page, and the NWS Great Falls website.

Showers and thunderstorms this afternoon and evening (Saturday, May 24th) are expected to transitions to a widespread rain by Sunday morning and persist through most of the day. There is a high risk that rainfall totals will exceed 1”by Sunday evening along the Rocky Mountain, with a high a high risk of rainfall totals exceeding 2” across portions of Western Pondera and Teton Counties. Flooding is possible, and those who live or are recreating in flood prone areas should be prepared to take action should water levels rise. Never drive through flood waters as you don’t know how deep the water is or the state of the road. Turn Around, Don’t Drown!