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Lesson 27 What happens to air masses meet?. Warm and cold air masses do not mix. When warm and cold air masses meet, they collide.

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Presentation on theme: "Lesson 27 What happens to air masses meet?. Warm and cold air masses do not mix. When warm and cold air masses meet, they collide."— Presentation transcript:

1 Lesson 27 What happens to air masses meet?

2 Warm and cold air masses do not mix. When warm and cold air masses meet, they collide.

3 The masses “battle” each other. This meeting causes many weather changes. The boundary between two air masses is called a front.

4 A warm front forms when a moving warm air mass pushes against a cold air mass. warmcold

5 The warm air of the front pushes upward. cold warm

6 It flows over the top of the cooler air mass.

7 Many clouds form along a warm front. They may reach out for 1,600 kilometers (1,000 miles) or more.

8 At first there are only thin cirrus clouds high in the sky. Then stratus clouds more in.

9 Slowly, the clouds become lower and lower. The sky becomes darker and darker

10 Finally, it rains.

11 Precipitation along a warm front is even and steady. It keeps falling until the front passes.

12 It may last a few days. Then the weather becomes clearer and warmer. A warm air mass has arrived.

13 If you watch TV, you have probably seen weather maps.

14 The symbol for a warm front is The warm front is moving in the direction of the semi- circles. In what direction would the above warm front be moving?

15 In what direction is the warm front moving?


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