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Air Masses and Fronts

Air Masses and Fronts. Chapter 20. Air Masses. Huge section of air that has the same weather throughout Take on the characteristics of the area they originated over maritime tropical – mT continental tropical – cT maritime polar – mP continental polar - cP. Air Mass Source Regions.

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Air Masses and Fronts

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  1. Air Masses and Fronts Chapter 20

  2. Air Masses • Huge section of air that has the same weather throughout • Take on the characteristics of the area they originated over • maritime tropical – mT • continental tropical – cT • maritime polar – mP • continental polar - cP

  3. Air Mass Source Regions

  4. Air Masses • As an air mass moves, it takes on the characteristics of the region it covers • Marine air masses lose moisture as they travel across continental areas • Temperatures change as mass moves from cold  warm or warm  cold

  5. Continental Polar • Cold and Dry in Winter • Cool and Dry in Summer • Can cause lake effect snow • Warm lake water adds moisture and becomes unstable

  6. Continental Tropical • Least influence on North America • Hot and Dry • Originates in SW USA and Mexico • Rarely causes weather change outside its source

  7. Maritime Polar • Cold and Wet • Sourced in the North Pacific • Low Clouds and Showers • Heavy Snow as air is lifted against mountains on the West Coast • Cause Nor’easters on the East Coast

  8. Maritime Tropical • Strong influence on weather in North America • Warm, Wet and Unstable • Most of the rain in Midwest and East Coast from mT air mass. • Mixed with Continental Polar to produce thunderstorms and tornadoes

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