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Air masses and fronts 2013
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Air masses and fronts 2013



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  • 1. Air Masses How do meteorologists use air masses and weather fronts to predict our weather?
  • 2. An air mass is alarge body of airwith similartemperature,pressure, andhumidity levelsthroughout. •
  • 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. Air Masses• Four types of air masses – Maritime – Continental – Polar – Tropical
  • 5. Air MassesContinental Maritime• Form over land and are dry • Form over water and are moist
  • 6. Air MassesTropical Polar• Form over the tropics (low • Form at the polar regions of latitudes) Earth (high latitudes)• Warm/Hot • Cool/Cold
  • 7. Air massesWhy does our weather change?Air masses move!How?Global winds push air masses around the Earth!
  • 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. 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. Cold Fronts• Click for Animation
  • 11. Cold Front• Moves quickly and can produce thunderstorms• After it moves through, skies will be clear and temperatures will be cooler
  • 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. Warm Front• Click for Animation
  • 14. Warm Front• Moves slower than cold fronts• Brings humid weather and sometimes rains for days• After it moves through, temperatures are warmer
  • 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. Stationary Front• Click for Animation
  • 17. Stationary Fronts• Two air masses next to each other, but neither moves.• Weather remains the same for days
  • 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?