Air masses and fronts 2013


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Air masses and fronts 2013

  1. 1. Air Masses How do meteorologists use air masses and weather fronts to predict our weather?
  2. 2. An air mass is alarge body of airwith similartemperature,pressure, andhumidity levelsthroughout. •
  3. 3. Air Masses• Get their properties from spending many days, even weeks, over the same area. – Example: If an air mass sits over an ocean for awhile, it becomes humid. – If an air mass sits over land, it becomes dry.
  4. 4. Air Masses• Four types of air masses – Maritime – Continental – Polar – Tropical
  5. 5. Air MassesContinental Maritime• Form over land and are dry • Form over water and are moist
  6. 6. Air MassesTropical Polar• Form over the tropics (low • Form at the polar regions of latitudes) Earth (high latitudes)• Warm/Hot • Cool/Cold
  7. 7. Air massesWhy does our weather change?Air masses move!How?Global winds push air masses around the Earth!
  8. 8. Air Masses Reflect• M- Describe the four types of air masses.• I- If you could become an air mass, which would you be and why?• U- What type of air mass do you think is affecting us today and why?• S- Create a flag for an air mass and explain why you chose that air mass.
  9. 9. Fronts• A front is a place where two different air masses meet• Three main types• A “battle” between air masses Maritime Tropical Continental Polar FRONT
  10. 10. Cold Fronts• Click for Animation
  11. 11. Cold Front• Moves quickly and can produce thunderstorms• After it moves through, skies will be clear and temperatures will be cooler
  12. 12. Cold Front Reflect• M- Explain the types of weather associated with a cold front.• I- Write a skit for a cold front with two characters: cold air mass and warm air mass.• U- A cold front passed through last night. Predict what the weather is like now?• S- Create a metaphor: A cold front is like a _______________________. Explain.
  13. 13. Warm Front• Click for Animation
  14. 14. Warm Front• Moves slower than cold fronts• Brings humid weather and sometimes rains for days• After it moves through, temperatures are warmer
  15. 15. Warm Front Reflect• M- Restate the cause of a warm front.• I- Which type of front do you feel is the best and why?• U- Compare and contrast warm fronts and cold fronts.• S- What would it be like to be a warm front?
  16. 16. Stationary Front• Click for Animation
  17. 17. Stationary Fronts• Two air masses next to each other, but neither moves.• Weather remains the same for days
  18. 18. Stationary Front Reflect• M- Summarize the three types of fronts.• I- You are charged with studying the effects of air masses and fronts. How would you do it?• U-Which type of front do you think is the most destructive and why?• S- Imagine you live in a world with only two types of air masses. How would that effect fronts?