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WEATHER
Lesson 3 - Page 4

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Fronts form when air masses collide because air masses do not mix unless they are similar in temperature and moisture content. When warm air displaces cold air at the ground, the front is referred to as a warm front. When cold air replaces warm air at the ground the front is referred to as a cold front.

If the boundary between warm and cold air does not move, it is called a stationary front. When a cold front meets a warm front, and goes under it, the fronts are occluding


Weather map symbols for fronts


Cold front

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