All About Tornadoes Animated PowerPoint. Informational text on how these severe weather storms develop and cause destruction. Learn about tornado structure, effects, and how they are measured with the Enhanced Fujita scale. Great addition to a nonfiction extreme weather, forces of nature, or natural hazards or disasters unit. Facts and details about the formation and structure of tornadoes, waterspouts, Tornado Season, classification, scale, Tetsuya Ted Fujita, preparation, Duck and Cover, watc