What is fog?

Fog is like a blanket made of tiny water droplets that floats on the air around you.

Imagine you're outside on a cold morning, and you look up, the sky is gray, and everything looks hazy, like it's wrapped in a soft, wet cloud. That’s fog! It happens when the air gets cool enough near the ground for water vapor (the invisible steam from your hot soup) to turn into tiny water droplets that you can see.

Fog is like a cloud that's sitting on the ground. Clouds are made of millions of tiny water droplets, just like fog, but clouds are up in the sky, and fog is close enough for you to walk through or even sit on!

Sometimes, when the air cools down (like at night or early in the morning), it can’t hold all that water vapor anymore. So the vapor turns into little water droplets that hang around in the air, and poof, there’s fog! It feels like you're walking through a wet blanket.

If you've ever seen your breath on a cold day, that's similar to how fog is made, just much bigger and all around you!