NOAA
Noaa: National Weather Service: Jet Stream Online School for Weather: Lightning
The National Weather Service presents this comprehensive site on lightning. Learn how lightning is created, what makes the sound of thunder, and ways to be safe during a storm. Learning lessons, frequently asked questions, and review...
NOAA
Noaa: Nssl: Questions and Answers About Lightning
Find out the causes of lightning, the strikes of lightning, the flashes, safety, and damage. Great place to have your questions about lightning answered.
Other
Kidstorm: Lightning
Learn about lightning formation and lightning safety with this detailed webpage.
University of Wisconsin
The Why Files: Looking at Lightning
An introduction to the science behind lightning, its causes, and effects. If you follow links, there are also pages on the medical risks associated with getting struck by lightning.