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 ...

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.

The rumble of thunderstorms across the country this week is a noisy reminder that summer is arriving—and with it, the mix of ...

The Mavericks’ three-game winning streak came to an end against their I-35 competition, while the Thunder improved to 22-1.