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Chapter 17 Section 2 Weather Patterns. 1. Why does weather constantly change?. - because of movement of air and moisture in the atmosphere. a large body of air that has properties similar to the part of Earth’s atmosphere over which it develops example: over land = dry

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Presentation Transcript
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Chapter 17 Section 2

Weather Patterns

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1. Why does weather constantly change?

- because of movement of air and moisture in the atmosphere

  • a large body of air that has properties similar to the part of Earth’s atmosphere over which it develops
  • example: over land = dry
  • over tropics = warm

2. air mass

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cool/ moist

cold/ dry

cool/ moist

3. What air masses affect the U.S.?

warm/ moist

warm/ moist

hot/ dry

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4. How do winds blow?

- from high pressure to low pressure

5. cyclones

  • winds in the northern hemisphere swirl in a counter-clockwise direction because of Earth’s rotation
  • associated with stormy weather
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blow away from a center of high pressure

  • winds spiral clockwise
  • fair weather

6. anticyclones

7. barometer

- Used to measure air pressure

8. Weather caused by pressure

  • Low pressure causes clouds
  • high pressure causes good weather
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1. front

- a boundary between two air masses of different density, moisture, or temperature

2. weather at frontal boundaries

- cloudiness, precipitation, and storms

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3. 4 types of fronts

  • cold - warm
  • occluded - stationary
  • cold air wedges under warm like a plow and forms clouds
  • big temperature differences cause thunderstorms or tornadoes
  • blue line with triangles

4. cold front

warm air

cold air

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5. warm front

  • lighter, warm air moves over cold air
  • wet weather
  • red line with semicircles

warm air

cold air

6. occluded front.

  • 3 air masses = cold, cool, and warm
  • cold moves toward cool and pushes warm air up
  • purple lines with triangles and semicircles

warm air

cold air

cool air

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7. stationary front

  • a boundary between air masses that stops advancing
  • light wind and precipitation
  • alternating red and blue line

cold air

warm air