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4. 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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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 more dense, it pushes the ................ air out of its way, forcing it to rise.
As the warm air rises, it becomes ................ and ................. start to form.
Precipitation at cold fronts is usually heavier although less geographically extensive (50-70 km) and less prolonged than rainfall associated with warm fronts.
The reason for this is that the uplift of the warm air 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 ........................... in the first hour.
Missing words
15 degrees, cold, cold, colder, colder, cooler, clouds, drier, hail, rain, thunderstorms, tornados, towering clouds form, warm, warmer |
