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 ...

Severe thunderstorms have formed over central and eastern Oregon today. At 2:50 p.m., the National Weather Service issued a Severe Thunderstorm Warning for Bend. A storm capable of 60-mile-per-hour ...

When lightning occurs, a large discharge of electricity causes the surrounding air to vibrate as it passes through the atmosphere to the surface. Q How does thunder form? — Hazel Foster, Madison, Wis.