WEB EXTRA: The Anatomy of the Midwest Tornadoes

By CNN News Wire

Published 11/18 2013 11:41AM

Updated 11/18 2013 11:44AM

Midwesterners are picking up the pieces after the region was hit with dozens upon dozens of reported tornadoes Sunday.

The storms killed six people and destroyed at least 70 homes in Illinois alone.

One of the big questions is - how did such a dangerous weather pattern creep up with so little notice?

It took millions of people by surprise, leaving little time to prepare or get out of the way.

Meteorologist Indra Petersons explains how this pattern of tornadoes formed and why it was so powerful.

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