Onslaught of Tornadoes

What has caused so many tornadoes this year?
3:00 | 05/24/11

Coming up in the next {{countdown}} {{countdownlbl}}

Coming up next:



Skip to this video now

Now Playing:


Related Extras
Related Videos
Video Transcript
Transcript for Onslaught of Tornadoes

This transcript has been automatically generated and may not be 100% accurate.

{"id":13671789,"title":"Onslaught of Tornadoes","duration":"3:00","description":"What has caused so many tornadoes this year?","url":"/Nightline/video/onslaught-tornadoes-13671789","section":"Nightline","mediaType":"default"}