Because lightning is so hot, it heats up the air around it instantly. When air gets hot that fast, it expands (pushes outward) very quickly, like a balloon popping. This creates a huge sound wave that travels through the sky. That sound is what we call . Fun Fact: Why do we see the light first?

You might notice that you always see the lightning before you hear the thunder. That’s because . It’s like a race where the light is a superhero flying at top speed, and the sound is a person jogging behind.

When they crash together, they create —the same kind of electricity that makes your hair stand up if you rub a balloon on your head or gives you a little "zap" when you touch a doorknob after walking on carpet. The positive charges move to the top of the cloud, and the negative charges move to the bottom. The Flash: Lightning

When that connection happens— ZAP! —a giant spark of electricity shoots through the air. That is . Lightning is incredibly hot—even hotter than the surface of the sun! The Boom: Thunder

If you count the seconds between the flash and the bang, you can tell how far away the storm is! Every five seconds you count equals about one mile of distance.

So, the next time you see a storm, remember: it’s just the clouds' way of balancing out their energy with a giant, noisy "high-five."

It all starts inside a big, fluffy thunderstorm cloud called a . Inside these clouds, the air is moving very fast. Bits of ice and raindrops are bumping into each other like bumper cars.

The Spark and the Boom: How Thunder and Lightning Work Have you ever watched a dark sky light up with a giant flash, followed by a loud BOOM that makes your windows rattle? It feels like nature is putting on a giant light show! But even though it looks like magic, it is actually all about science. The Setup: Clouds Getting "Static-y"