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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 >

Overview

Severe thunderstorms developed along and ahead of a cold front moving southeast across central South Dakota during the late afternoon and evening hours on August 30th, 2020.  These thunderstorms produced hail up to 2" in diameter and an EF-2 tornado north of Miller, SD which resulted in a fatality when an RV was struck on SD HWY 45. This was the first tornado-related fatality in South Dakota since June 4th, 1999.

We wish to thank emergency management, first responders, storm chasers, trained spotters, and the public for the information they provided to us during and after the event.

Tornado picture at 6:13 PM north of Miller, SD. Photo taken by Lucus Howard
Tornado picture at 6:13 PM north of Miller, SD. Photo taken by Lucus Howard

Surface weather chart at 4pm on August 30, 2020.  The cold front in western and northern South Dakota was moving southeast across the state.
Surface weather chart at 4pm on August 30, 2020.  The cold front in western and northern South Dakota was moving southeast across the state. "Sandwich" satellite loop of the storms from 4pm to 9pm on August 30, 2020.  Radar loop of the severe thunderstorms that occurred during the evening of August 30, 2020.
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