On April 3-4, 1974, one of the most intense and widespread tornado outbreaks devastated 13 states and the Canadian province of Ontario. At least 148 tornadoes were confirmed, and this outbreak holds the record for most F5 tornadoes produced from a single event. In this special 90-minute webinar, our panelists discuss this historic day's synoptic set-up and operations and some of the outcomes from research conducted on this event.