# Weather Fronts Lesson for Kids

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• 0:04 What Is a Front?
• 0:49 Cold Front
• 1:21 Warm Front
• 1:42 Stationary Front
• 2:02 Occluded Fron
• 2:21 Lesson Summary
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Lesson Transcript
Instructor: Catherine Brennan

Katie has taught elementary school science and has a masters degree in Curriculum and Instruction.

When air masses meet, they create weather fronts. The air masses typically have different temperatures and densities so their impact on weather depends on the type of front created.

## What Is a Front?

Sam is sitting on his front porch watching his dog play. Suddenly, he gets shivers from the cold air. Before he knows it, the weather has changed and his dad is calling him inside before it rains. ''What happened?'' asked Sam. Sam's dad responds that he just experienced a front.

A front is when two air masses meet and create some type of weather or precipitation. Precipitation is water we get from the atmosphere. Density is how much mass and volume something takes up. The density of each air mass can vary, causing a change in the air. When the air becomes warmer, the molecules spread out and cause the air molecules to go up. When air becomes colder, the molecules come closer together and cause the air molecules to go down. When air masses meet, we get a few different types of fronts.

## Cold Front

A cold front happens when a colder air mass meets and pushes a warm air mass up. When the two meet, the density of the cold air mass pushes the less dense warm air mass up. Imagine flipping a glass plate and a paper plate upside down and ramming them into each other, the paper plate will slide over the top of the glass plate because it weighs less. This is like a cold front.

The temperature of the air becomes colder because the warm air is pushed up higher into the atmosphere and replaced with the colder air. A cold front also causes thunderstorms and heavy precipitation.

## Warm Front

A warm front happens when a warm air mass takes over a colder air mass. The warm air mass replaces the cold air molecules in the cold air mass. The temperature of the air becomes warmer as the cold air is pushed back. The amount of water in the air (or humidity) will usually increase, causing precipitation. The precipitation is usually lighter than in a cold front.

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