Pg class26-air masses, fronts

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Pg class26-air masses, fronts

  1. 1. Lecture 26 Air Masses and Fronts
  2. 2.  Definition: ◦ Large (diameter > 1600 km) body of air ◦ Similar characteristics throughout ◦ Recognizable entity; travel as one 2 Figure 7-2
  3. 3. ◦ Modifies area over which it moves ◦ Is changed by area over which it moves
  4. 4.  MOISTURE CONTENT  c—continental, dry  m—maritime, humid  Temperature  P—polar source region  T—tropical source region  A—arctic source region  E—equatorial source region 4
  5. 5. 5 Figure 7-1
  6. 6.  Southwestern Deserts – cT  More moderate conditions in NW vs NE – mP vs. cP
  7. 7. 8
  8. 8.  ―Front‖ of an air mass  Midlatitude clashes  Types of Fronts: ◦ Cold front: cold air advancing ◦ Warm front: warm air advancing ◦ Stationary front: no advance of air masses ◦ Occluded front: cold front overtakes warm front 9
  9. 9.  Cold Front ◦ Fast moving, Steep frontal interface, warm air rises at front ◦ Tall clouds, severe weather, ―Squall line‖ 10
  10. 10.  Warm Front ◦ Gentle slope of warm air rising above cool air ◦ Slow moving ◦ Sequence of clouds precedes front ◦ Steady precipitation 11
  11. 11.  Stalled warm and cold fronts  Can produce prolonged rain
  12. 12. Cold front overtakes warm front

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