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Animation of a cold front, author: Dr. Horst Rudolf, university of Bielefeld in cooperation with his pupils
source: http://www.learn-line.nrw.de/angebote/klima/medio/bilder/kfront.gif
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Missing words
15 degrees, cold, cold, colder, colder, cooler, clouds, drier, hail, rain, thunderstroms, tornadoes, towering clouds form, warm, warmer
Passage of a cold front:
Cold fronts occur when a .............. air mass replaces a ................ air mass.
In a cold front the .............. air follows the warm air, and, because .................. air is denser, pushes ................ air out of its way, forcing the warm air to rise.
The lifting warm air mass becomes ................, and ................. start to form.
Precipitation at cold fronts are usually heavier although less extensive (50-70 km) and less prolonged.
The reason for this is that the uplift of warm air there is stronger due to the undercutting of cold air, so......................................., and .........., ......................................, ................ and ............................ can occur.
The air behind a cold front is noticeably .......................... and ................... than the air ahead of it.
When the cold front passes through, temperatures can drop more than ........................... within the first hour.
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