ENDERLIN, N.D. (AP) - A deadly tornado that tore across North Dakota this summer has been upgraded to an EF5 with winds over 200 mph (322 kph), the strongest classification of tornado and the first on American soil in 12 years, meteorologists said Monday.

The tornado on June 20 in Enderlin caused significant damage across the region and killed three people. The tornado touched down on the ground for just over 12 miles (19 kilometers), and at its largest, was 1.05 miles wide (1.69 kilometers).

Meteorologists from the National Weather Service in Grand Forks estimated that the tornado had winds in excess of 210 mph (338 kph), according to a Weather Service analysis released on Monday.

The 1999 Bridge-Creek Moore tornado in Oklahoma holds the record of the strongest winds ever recorded at 3

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