Excessive heat is America's No. 1 weather killer most years. This heat wave 30 years ago claimed hundreds of lives in the ...

“We have a very big ask” in return, the U.S. official says. It starts with removing whatever nuclear material and enrichment infrastructure remains, and continues with hard limits on Iran’s missile ...

Tornadoes come in all shapes and sizes, ranging from terrifying behemoths to awe-inspiring, graceful twisters. In this video, ...

Tornadoes have always been a fascinating yet terrifying natural phenomenon, but some of them leave behind destruction that seems almost unreal. What does it take for a tornado to become an EF-5? How ...