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Weather Patterns

Weather Patterns. Air Masses and Fronts. (1). Air Masses. Air masses are large bodies of air that have the same properties as the area of the Earth’s surface over which it forms and moves. For example, deserts produce hot dry air masses. Air Masses (continued). Cool Dry. Cool Moist.

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Weather Patterns

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  1. Weather Patterns Air Masses and Fronts

  2. (1) Air Masses • Air masses are large bodies of air that have the same properties as the area of the Earth’s surface over which it forms and moves. • For example, deserts produce hot dry air masses.

  3. Air Masses (continued) Cool Dry Cool Moist Cool Moist Warm Moist Warm Dry Warm Moist

  4. (2) Fronts • The place where air masses meet is called a front. • Weather is caused by the way these air masses interact.

  5. (3) Cold Fronts • Incoming dense cold air pushes up warm air • This forms a narrow band of violent storms

  6. Warm Fronts • Warm air slides over departing cool air. • This forms feathery clouds.

  7. Occluded Fronts • Two cool air masses meet and pushes up warmer air. • This causes strong winds and heavy precipitation.

  8. Stationary Front • A cool air mass and a warm air masses meet and stop moving (neither one advances). • This causes a few days of rainy and windy weather.

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