A powerful cold front over the American plains joined a warm air mass from the south on April 3, 1974, creating the perfect conditions for an 18-hour catastrophe now known as the Tornado Super Outbreak. Revisit the epic disaster that swept from Michigan to Alabama, powered by 148 tornadoes, 30 of them category F4 or F5. Through local news broadcasts, stunning audio recordings, and eyewitness home movies, look back on one of the most violent natural disasters in history.