Tornado outbreak sequence of June 9-13, 2021

The tornado outbreak sequence of June 9-13, 2021 was a deadly series of tornado activity across the Great Plains and Midwestern areas of the United States. Over the four-day period, 132 tornadoes were confirmed in 8 states, resulting in 51 fatalities and causing over $4 billion in damage. The outbreak sequence peaked on June 10, on which 81 tornadoes touched down in the Dakotas and western Minnesota, including the first officially-rated EF5 tornado since 2018. 42 fatalities occurred on June 10, making it the deadliest 24-hour period of tornadic activity since November 12, 2019, on which 44 fatalities occurred. An additional 26 tornadoes were confirmed in Texas and far southern Oklahoma on June 12, including another violent tornado, rated EF5 based on severe vegetation damage.

A total of 51 fatalities occurred as a result of the outbreak; 39 of which were caused by the Ashley, North Dakota tornado. In addition to the tornadic fatalities, one person was struck by lightning and killed in South Dakota on June 10, while another person was killed in a flash flood in Missouri on June 13. The outbreak caused a total of $870 million in damages, making it the costliest outbreak since 2014.