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Preliminary Storm Summary for May 12, 2022 Derecho

A derecho moved through the Northern Plains during the late afternoon and early evening hours of Thursday, May 12th, including e SD and w central MN. It produced straight-line winds of between at 60 to over 100 mph. Several tornadoes were reported and confirmed. Some of the worst damage occurred in Castlewood, when an EF2 tornado with wind speeds up to 120 mph passed through town. 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 a tornado north of Miller, SD.

 

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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