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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

Srinivasa Ramanujan, Indian mathematician and autodidact.

6 Interesting Facts about Srinivasa Ramanujan

Colorful winter sunset

What's the Difference Between a Solstice and an Equinox?

Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics

10 Best Hockey Players of All Time

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

9 of the World’s Deadliest Mammals

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

Coriander leaves, fresh green cilantro on wooden background, herbs

Why Does Cilantro Taste Like Soap to Some People?

front: References & Edit History

More Articles On This Topic

Assorted References

cold front
- In cold front
extratropical cyclone
- In extratropical cyclone
- In cyclogenesis
fog formation
- In fog
weather disturbances
- In climate: Extratropical cyclones
weather forecasting
- In weather forecasting: Progress during the early 20th century

Article Contributors

Primary Contributors

The Editors of Encyclopaedia Britannica

Other Encyclopedia Britannica Contributors

Article History

Type	Description	Contributor	Date
	Series of weather maps depicting a cold-air outbreak over North America in January 2011 added.	John P. Rafferty	Jun 26, 2012
	Media added.	Chelsey Parrott-Sheffer	Jun 04, 2008
	Article revised and updated.	John P. Rafferty	Jun 27, 2007
	Article added to new online database.	The Editors of Encyclopaedia Britannica	Jul 20, 1998