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On June 17, 2010, a significant tornado outbreak occurred across the Northern Plains. Beginning around 2 PM, thunderstorms moved across the region, producing 74 tornadoes. Of those tornadoes, 48 were in Minnesota, eclipsing the single-day tornado record. At the time that it occurred, it went down as the 17th largest tornado outbreak on record in the United States, and the 2nd largest in the summer months of June-August.

Download a 7-page PDF information guide on this tornado outbreak

Left: tornado track map from 17 June 2010. Right: Mammatus clouds over the NWS Chanhassen Forecast Office

This web page is a collaborative effort between the National Weather Service offices in Chanhassen, MN, Grand Forks, ND, and Duluth, MN. It is intended to give a broad summary of information related to the entire tornado outbreak. Additional contributions were made by the offices in Bismarck, Des Moines, and La Crosse.

The summary information about this outbreak is contained in the various pages linked above in the navigation menu.


Fast Facts

  • 74 tornadoes across four states, including 48 in Minnesota. The number of Minnesota tornadoes was a new state record for tornadoes in a day.
  • 16 strong to violent tornadoes (rated EF2 or higher), with 11 of those in Minnesota.
  • The three EF4 tornadoes in Minnesota were the first in the state since the Granite Falls F4 of July 25, 2000.
  • In terms of number of tornadoes, this outbreak was the 2nd largest on record in meteorological summer (June to August) at the time it occurred.
  • NWS offices in the Northern Plains began to advertise the potential for severe weather 5 days in advance of this tornado outbreak in the Hazardous Weather Outlook products.
  • The Storm Prediction Center issued Tornado Watches with a combined average lead time of 4 hours and 24 minutes for the tornadoes.
  • 87 Tornado Warnings, 83 Severe Thunderstorm Warnings, and 3 Flash Flood Warnings were issued by National Weather Service offices in this region over approximately a 12 hour period. 279 follow-up statements to those warnings were also issued.
  • The average lead time for Tornado Warnings during this outbreak was slightly over 19 minutes.


Existing Web Pages

Click on an area of North Dakota, Minnesota, or Wisconsin below in order to navigate to a particular office's existing web write-up on the event. You can also navigate to these pages via the text links below.

Grand Forks
La Crosse

Bismarck Grand Forks Duluth Chanhassen La Crosse

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