sentences:  Huntsville lies in a region colloquially known as Dixie Alley, an area more prone to violent, long-track tornadoes than most other parts of the US.On April 27, 2011, the largest tornado outbreak on record, the 2011 Super Outbreak, affected northern Alabama.During this event, an EF5 tornado that tracked near the Browns Ferry Nuclear Power Plant destroyed many transmission towers and caused a multi-day power outage for the majority of North Alabama.