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WEATHER PATTERNS

Learn about air masses, highs and lows, fronts, and the factors that influence weather changes. Discover how air pressure and wind direction affect weather patterns.

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WEATHER PATTERNS

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  1. WEATHER PATTERNS

  2. WHAT CAUSES WEATHER TO CHANGE? • Air masses • A large body of air that moves across the Earth’s surface. • Highs and Lows • Wind blows from areas of high pressure to areas of low pressure. • Winds blow away from the center of high pressure. • High pressure is associated with good weather. • Low pressure is associated cloudy weather. • A barometer is used to measure air pressure. • SI unit of measurement is mb (millibars)

  3. WHAT IS A FRONT? • A boundary between two air masses of different density, moisture, or temperature. • They are represented by curving lines. • Cloudiness precipitation, thunderstorms tornadoes and other severe weather are often associated with fronts.

  4. WHAT IS A COLD FRONT? • Occurs when colder air advances toward warm air. • The cold air wedges under the warm air like a plow.

  5. WHAT IS A WARM FRONT? • Lighter, warmer air advances over heavier, colder air.

  6. WHAT IS AN OCCLUDED FRONT? • Involves three air masses of different temperatures-colder air, cool air, and warm air. • May form when a cold air mass moves toward cool air with warm air between the two air masses.

  7. WHAT IS A STATIONARY FRONT? • A boundary between air masses stops advancing. • May remain in the same place for several days. • Produces light wind and precipitation.

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