When it comes to severe weather, especially tornadoes, it helps to know how these storms form and what you need to do when ...

Beginning at precisely 2:23 p.m. the team caught images that have—in a breakthrough—made it possible to calculate wind speeds close to the ground, where tornadoes rip through human lives.

Tornadoes in the South and Midwest overnight and early Saturday left 11 dead in Missouri. More tornadoes are forecast ...