How do harmless puffy white clouds grow into towering, potentially dangerous cumulonimbus thunderstorms? On their surface, clouds appear to be an odd contradiction of nature — light enough to float on ...

A Amanda Gumber, research assistant, Space Science and Engineering Center at the University of Wisconsin-Madison: Thunder is formed by the intense heating produced by lightning. The thunder you hear ...

A massive thunderstorm turns the sky dark over a field in Sweden. Thunderstorms can inspire the entire range of human emotion with their vivid displays of nature's fury. Storms are used to set an ...