what makes the noise of thunder

Thunder’s noise comes from air rapidly expanding and contracting around a lightning bolt, creating a powerful shock wave that we hear as a crack, boom, or rumble.

What actually makes the sound?

When lightning flashes, it heats the air in its narrow channel to tens of thousands of degrees in less than a second, much hotter than the surface of the Sun. That air suddenly expands like an explosion, then cools and contracts, sending out a shock wave in all directions, which your ears detect as thunder.

Why thunder is a boom or a rumble

• A nearby, small section of lightning can sound like a sharp crack or bang because you are close to one intense part of the shock wave.

• A long or forked lightning bolt produces many overlapping shock waves; as they travel, reflect off clouds and terrain, and weaken, they blend into a rolling rumble.

• You also hear the parts of the lightning channel at different distances at slightly different times, stretching the sound out into that familiar growl.

Why thunder comes after lightning

Light travels almost instantly to your eyes, but sound moves much slower through air. You see the lightning first, then the shock wave arrives later as thunder, with the delay growing about 3 seconds for every kilometer (about 5 seconds per mile) of distance.

One-line takeaway

Thunder is simply the sound of a lightning‑made shock wave in the air, born from extreme, sudden heating and expansion along the lightning’s path.

Information gathered from public forums or data available on the internet and portrayed here.