This story appears in the July 2012 issue of National Geographic magazine ... teamed with renowned storm chaser Roger Hill, a witness to more than 600 tornadoes. Over the past three years ...

This story appears in the August 2012 issue of National Geographic magazine. It’s a good thing ... following the storm east toward Guymon. Ahead of us clouds are boiling up like cauliflower ...

This story appears in the September 2007 issue of National Geographic magazine ... a bit like the archaeological version of storm chasers, hustling to newly discovered excavation sites before ...