https://www.weather.gov/arx/ef5tornadoes
First F5/EF5 Tornado in Iowa Since June 1976
ef5 tornadofirstiowasincejune
https://www.fox4news.com/weather/north-dakota-ef5-tornado-upgrade-why
How new research led to North Dakota tornado's EF5 upgrade | FOX 4 Dallas-Fort Worth
A powerful tornado struck Enderlin, North Dakota, on June 20, causing significant damage and leading to a rare EF5 classification after new research. Here's...