Jet streams play a key role in how tornadoes are formed. When it comes to tornadoes, you’ve seen them, and you’ve seen what they can do. But do you really know how a tornado forms into that monstrous ...

Tornadoes are complex and tough to predict but this short documentary from NASA is a good introduction to how they work. Researcher Tim Samaras explains how different weather systems collide across ...

There are more tornadoes in the US than anywhere else on Earth. How do they form? This is in part because of the geography of the US. (AP video/Laura Bargfeld; Production/Shelby Lum; Animation/Eva ...

The deaths Friday of veteran storm chaser Tim Samaras, his son Paul and their friend Carl Young when a tornado near El Reno, Okla., pummeled their vehicle has raised some questions: -- Why do storm ...