Lori Peek spent years researching case studies ranging from Hurricane Katrina to Lyons flooding for a new guidebook.
Tornadoes were reported by several spotters, as well as hail up to the size of baseballs.
Journalist Brantley Hargrove recently wrote a book about Coloradan Tim Samaras, a legend among storm chasers.
Colorado’s tornado season typically starts in May. Peak twister activity is usually the first week of June.