University of Illinois
University of Illinois Urbana Champaign: Thunderstorms
View a chart that has single cell, multicell, multicell line, and supercell thunderstorms. You can link to some of the kinds of thunderstorms for more specific information.
Other
K 3 Learning Pages: Web Resources Thunderstorms
Check out this comprehensive list of web resources on thunderstorms and safety. Students and teachers will benefit from the links found on this site.