Tornadoes May 8, 2020 5:25 pm Supercells Cause Tornadoes, But What Are They? Behind every tornado is a weather phenom known as a supercell. Here’s a quick primer on what supercells are, what they look like and what causes them. Local 0:59 Runaway zebras corralled in Washington state; one still missing 1:40 Charlie Puth reacts to Taylor Swift's ‘The Tortured Poets Department' name-drop 2:52 Severe weather kills at least 5 as tornadoes rip through Midwest and South 0:48 World Central Kitchen to resume operations in Gaza 2:08 Travis Kelce calls Taylor Swift his ‘significant other' as they attend Charity Gala Date Night