NSF NCAR scientist Morris Weisman is a noted authority on what makes thunderstorms and tornadoes tick. In this talk he reviews some of the basic advances in both understanding and forecasting these extreme events, with a special emphasis on notable events in Colorado, including the Windsor and Limon tornadoes. Topics will include supercell storms, which generate the most intense tornadoes and hailstorms worldwide, as well as landspouts, which are a weaker form of tornadoes and somewhat of a Colorado specialty. He will also talk about recent field campaigns and the evolution of storm chasing over the years, including some of his own anecdotes from chasing on the plains of Colorado.