front

Table of Contents

Introduction References & Edit History Quick Facts & Related Topics

Images & Videos

cold-air outbreak

World patterns of thunderstorm frequency.

Horizontal divergence and convergence patterns associated with the polar-front jet.

Explore what happens when cold and warm air masses collide

For Students

Discover

Hemp (Cannabis sativa).

9 Mind-Altering Plants

A mug shot taken by the regional Colombia control agency in Medellin

Pablo Escobar: 8 Interesting Facts About the King of Cocaine

Stylish light blue jeans on wooden background, closeup of inset pocket

Why Do Jeans Have That Tiny Pocket?

Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland

The Largest Islands in the World

Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro

Why Is Christmas in December?

Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.

9 of the World’s Deadliest Mammals

Christmas tree, holiday, pine

How Did the Tradition of Christmas Trees Start?

front: Media

meteorology

Videos

Explore what happens when cold and warm air masses collide

Explore what happens when cold and warm air masses collide

Weather is created by the movement and interaction of air masses of different temperatures.

Video: Created and produced by QA International. © QA International, 2010. All rights reserved. www.qa-international.com

Images

cold-air outbreak

cold-air outbreak

Series of weather maps showing the evolution of a cold front in North America over...

Encyclopædia Britannica, Inc.

World patterns of thunderstorm frequency.

World patterns of thunderstorm frequency.

Encyclopædia Britannica, Inc.

Horizontal divergence and convergence patterns associated with the polar-front jet.

Horizontal divergence and convergence patterns associated with the polar-front jet.

Encyclopædia Britannica, Inc.

VIEW MORE in these related Britannica articles: