In this short NASA documentary, storm researcher Tim Samaras describes how satellite imaging can help predict tornadoes. Because it's unclear exactly how various weather conditions come together to catalyze a tornado, it's hard to predict them more than 15 minutes in advance, Samaras says. He's hoping that the NOAA and NASA's GOES-R satellites will help change that. 

For more documentaries from NASA, visit http://www.nasa.gov/.