Read Colonel Robert Miller's account of his history-making first operational tornado forecast in March, 1948.

Access a scientific explanation of the Fuijita Scale, an intensity measurement device that examines tornado damage on man-made structures.

Encyclopedia article describes a highly destructive variety of localized storm characterized by violent, rotating winds.

Devoted to tornado and storm chasing, storm spotting, severe-weather research, weather photographs and storm safety. Access severe weather data.

Read about the 75th anniversary of the 1925 Tri-State Tornado presented by the National Weather Service office in Paducah, Kentucky .

Take a photographic tour of Oklahoma twisters. Includes explanatory text.

Access this memorial resource that is dedicated to the victims of the Pine Lake Tornado. Includes pictures, facts, and stories.

Provides daily updated news links and a comprehensive directory to information about tornadoes. Includes articles and photographs.

Features a chronological gallery of tornado photographs by Adam Frederick.

Compiled from questions asked of the author and his colleagues as well as basic tornado research information and countless scientific resources.

Take a photographic tour of twisters in the state of Oklahoma. Includes explanatory text and educational material about storm development.

Find out where tornadoes get their energy and read the scientific definition of a twister. Get the latest word on tornado predictions.

Basic tornado research and science, with the latest reports and a guide to safety.

Read a brief description of the makeup of tornadoes from Warner Brothers Studios producers of the 1996 film "Twister."