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Air movement 15.3


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Air movement 15.3

  1. 1. CH. 15-3 Air Movement
  2. 2. Forming Wind  Wind – the movement of air from an area of higher pressure to an area of lower pressure.  Air pressure is lower where air is warmer.
  3. 3. Coriolis Effect  The rotation of the Earth that causes moving air and water to appear to turn to the right in the northern hemisphere & to the left in the southern hemisphere.
  4. 4. Global Winds  Trade winds – winds created by air descending to Earth’s surface between the equator and 30° latitude.  Westerlies – winds formed between 30° & 60° latitude that move weather systems in the US.
  5. 5. Winds in Troposphere  Jet streams – narrow belts of strong wind that blow near the top of the troposphere from west to east.  Helps move storms across the country
  6. 6. Winds in Troposphere  When flying eastward, jets save time & fuel.  When flying westward, planes fly at different altitudes to avoid jet streams.
  7. 7. Sea Breezes  Movement of air from sea to land during the day.  Cooler air from above the water moves over land, forcing the warm, less dense air above land to rise.
  8. 8. Land Breezes  The movement of air toward the water from land at night.  At night, land cools faster than ocean water.  Air over land becomes cooler & moves over the ocean water.