What’s stirring up this winter’s extreme storms?

Aired: 12/28/2015 | 0:06:10 | Clip
Violent weather has battered the South and Midwest in recent days, bringing the death toll from up to 45. On Saturday, at least nine tornadoes swept through the Dallas area, blasting neighborhoods with winds of about 200 miles an hour. In other states, snow and ice caused power outages and heavy rain triggered deadly flooding. Jeffrey Brown talks to Bob Henson of Weather Underground.

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