Thunder is one of nature’s most dramatic sounds, accompanying brilliant flashes of lightning during a storm. But what causes this rumbling roar in the sky? To understand thunder, we must first explore ...

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 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 ...