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Gr 2–4—Lightning flashes from a heavy, dark cloud, and dramatic music conveys that a serious event is about to unfold. Warm, humid air, pictured in red arrows, rises from the ground, creating an updraft. Blue arrows represent the downdraft that occurs when warm and cool air meet. The drafts spiral together and create a funnel cloud, called a tornado when it touches the ground. The Enhanced Fujita Tornado Scale is named for the scientist who developed the measu...Log In or Sign Up to Read More