The most extreme tornadoes have winds over 200 mph and can measure over a mile wide, and it has been over a decade since the ...

The Joplin tornado became one of the deadliest twisters in United States history when it tore through a small city in ...

Researches found little evidence that tornadoes were getting weaker. Instead, it appears that a subjective tornado grading system is to blame.

A quirky aspect of the way we measure twisters helps explain why there hasn't been a top-tier-rated tornado in 12 years.

Residents walk in the street after a massive tornado hit Joplin, Missouri in May 2011.

Her work has previously appeared in Just Jared and Buzzfeed. AP Photo/Mike Gullett The Joplin tornado became one of the deadliest twisters in United States history when it tore through a small ...

May 20, 2013, marks the last time the United States was hit by the worst type of tornado. On that date, a monster EF5 tornado tore a 17-mile path through the Oklahoma City suburbs, creating "40 ...