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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
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Quizzes
Lightning over a farm field. Weather electricity thunderstorm light energy tree
Facts You Should Know: Weather Quiz
Umbrella colored like a rainbow sticking out above a sea of black umbrellas while it rains. (storm, weather)
Weather Words Vocabulary Quiz
rain. Child in the rain, wearing a rain coat, under a yellow umbrella. April Showers weather climate rain storm water drops
April Showers to March’s Lions and Lambs
Iceland, Glacier lagoon (Jokulsarlon)
Winter Weather Words Quiz
Discover
Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that
America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)
Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
10 Famous Artworks by Leonardo da Vinci
Rural Irish landscape, Sligo, Ireland.
Why Is Ireland Two Countries?
Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway
Flags That Look Alike
Santa Claus flying in his sleigh, christmas, reindeer
Was Santa Claus a Real Person?
A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000
14 Tough Questions Answered
New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.
Why Is It Called Black Friday?

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Facts

Also Known As frontal zone • air front

Photos and 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
See All Videos and Images →

Related Topics and References

Topics

Key People

Tor Harold Percival Bergeron
Scandinavian meteorologist

Related Quizzes and Features

Quiz
Iceland, Glacier lagoon (Jokulsarlon)
Winter Weather Words Quiz
Umbrella colored like a rainbow sticking out above a sea of black umbrellas while it rains. (storm, weather)
Weather Words Vocabulary Quiz
Lightning over a farm field. Weather electricity thunderstorm light energy tree
Facts You Should Know: Weather Quiz
rain. Child in the rain, wearing a rain coat, under a yellow umbrella. April Showers weather climate rain storm water drops
April Showers to March’s Lions and Lambs