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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
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Hindu Holi Festival celebrations with colored water, powder and colorful flower petals thrown over celebrants at a Hindu temple in Mathura, Uttar Pradesh, India on March 24, 2021.
Holi: Festival of Colors
A mug shot taken by the regional Colombia control agency in Medellin
Pablo Escobar: 8 Interesting Facts About the King of Cocaine
Calendar marking march 15th
22 Questions About Time and Timekeeping Answered
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
World Data Locator Map: Australia
Is Australia an Island?
Franklin D. Roosevelt, who formulated the Four Freedoms.
7 Alphabet Soup Agencies that Stuck Around
An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.
11 Egyptian Gods and Goddesses

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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
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
Iceland, Glacier lagoon (Jokulsarlon)
Winter Weather Words Quiz