CHICAGO (WLS) -- The most recent tornado outbreak in Illinois was the biggest the state has seen in the month of December, according to the National Weather Service. At least 26 tornadoes formed ...

Tornadoes can get extremely large, and that's terrifying. Watch this video to learn about the largest tornado ever known to have formed, the El Reno tornado in 2013.

Last year, tornadoes killed 68 people. The deadliest single storm hit Somerset–London, Kentucky on May 16, killing 19. A separate outbreak across Alabama, Arkansas, Missouri, Oklahoma, Kansas, ...