Yahoo TV
Please enable Javascript

Javascript needs to be enabled in your browser to use Yahoo TV.

Here’s how to turn it on: https://help.yahoo.com/kb/enable-javascript-browser-sln1648.html

Weather detectives: How experts discern a tornado’s power

CBSTV Videos
In Bessemer, Ala., a National Weather Service Storm Survey Team demonstrates why an early assessment of damage helps gauge a severe storm’s power. CBS News’ Vicente Arenas reports.