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9th Grade Chapter 3 Lesson 2


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9th Grade Chapter 3 Lesson 2

  1. 1. 9 th Grade Chapter 3 Lesson 2 Pgs. 56 – 60 (Start at Air Masses) For Student Use Only
  2. 2. Air Masses <ul><li>Different Densities: </li></ul><ul><ul><li>Air can have different densities. </li></ul></ul><ul><ul><ul><li>Based on: </li></ul></ul></ul><ul><ul><ul><ul><li>Temperature </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Humidity </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Pressure </li></ul></ul></ul></ul>
  3. 3. Air Masses <ul><li>Density: </li></ul><ul><ul><li>Temperature </li></ul></ul><ul><ul><ul><li>Warm air has a lower density </li></ul></ul></ul><ul><ul><ul><li>Cold air has a higher density </li></ul></ul></ul><ul><ul><li>Humidity </li></ul></ul><ul><ul><ul><li>Low moisture- higher density </li></ul></ul></ul><ul><ul><ul><li>High moisture- lower density </li></ul></ul></ul><ul><ul><li>Pressure </li></ul></ul><ul><ul><ul><li>High pressure- more dense </li></ul></ul></ul><ul><ul><ul><li>Low pressure- less dense </li></ul></ul></ul>
  4. 4. Air Masses <ul><li>Air Mass: </li></ul><ul><ul><li>AIR MASS- is a body of air with the relatively uniform temperature, humidity, and pressure. </li></ul></ul><ul><ul><ul><li>Temperature, Humidity, and Pressure affect the density on an air mass and can prevent them from mixing. </li></ul></ul></ul>
  5. 5. Air Masses <ul><li>Air Masses: </li></ul><ul><ul><li>Tropical- warm air masses </li></ul></ul><ul><ul><li>Polar- cold air masses </li></ul></ul><ul><ul><li>Maritime- moist, humid </li></ul></ul><ul><ul><li>Continental- dry </li></ul></ul>
  6. 6. Air Masses <ul><li>Air Masses: </li></ul><ul><ul><li>Maritime Tropical- form over the ocean of the topics- humid and hot </li></ul></ul><ul><ul><li>Continental Tropical- form over land masses in the tropics- hot and dry </li></ul></ul><ul><ul><li>Maritime Polar- form over oceans in artic regions- cold and wet </li></ul></ul><ul><ul><li>Continental Polar- form over land masses near the poles- cold and dry </li></ul></ul><ul><ul><li>Arctic- form over snow and ice covered portions of the arctic- dry and very cold </li></ul></ul>
  7. 7. Air Masses <ul><li>Air Mass Weather </li></ul><ul><ul><li>Air Mass Weather- when a region experiences the same general weather conditions from day to day caused by the passing air mass </li></ul></ul>
  8. 8. Air Masses <ul><li>Fronts and Weather </li></ul><ul><ul><li>Fronts: named by which air mass advances into the other air masses territory </li></ul></ul><ul><ul><ul><li>Cold </li></ul></ul></ul><ul><ul><ul><li>Warm </li></ul></ul></ul><ul><ul><ul><li>Stationary </li></ul></ul></ul><ul><ul><ul><li>Occluded </li></ul></ul></ul>
  9. 9. Air Masses <ul><li>Air Masses: </li></ul><ul><ul><li>Cold Front- Mass of cold air moves into the territory of a mass of warm air- usually brings severe weather </li></ul></ul><ul><ul><li>Warm Front- Mass of warm air moves into a territory of cold air- usually brings high cirrus clouds followed by light and continuous precipitation </li></ul></ul>
  10. 10. Air Masses <ul><li>Air Masses </li></ul><ul><ul><li>Stationary Front: when two air masses battle and none can overpower the other </li></ul></ul><ul><ul><ul><li>This causes precipitation for many days </li></ul></ul></ul><ul><ul><ul><li>Frontal Lows: smaller whirlpools of low pressure in between the winds </li></ul></ul></ul><ul><ul><li>Occluded Front: when a fast moving cold front overtakes the slower moving warm front </li></ul></ul><ul><ul><ul><li>Cold air moves faster than warm air </li></ul></ul></ul>