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Air Masses & Fronts

Air Masses & Fronts. What is an AIR MASS?. An air mass is a huge body of air that influences weather. Scientists classify air masses based on: TEMPERATURE and HUMIDITY. WET. WARM. COLD. DRY. Air Masses are named based on where they FORMED…. = TROPICAL = POLAR

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Air Masses & Fronts

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  1. Air Masses & Fronts

  2. What is an AIR MASS? • An air mass is a huge body of air that influences weather. • Scientists classify air masses based on: TEMPERATUREand HUMIDITY WET WARM COLD DRY

  3. Air Masses are named based on where they FORMED… = TROPICAL = POLAR = MARITIME (means sea… wet) = CONTINENTAL (means land… dry) WARM COLD WET DRY

  4. How are Air Masses named? WET DRY MARITIME TROPICAL CONTINENTAL TROPICAL WARM MARITIME POLAR CONTINENTAL POLAR COLD

  5. North American Air Masses MARITIME POLAR CONTINENTALPOLAR MARITIMEPOLAR MARITIMETROPICAL MARITIMETROPICAL CONTINENTALTROPICAL

  6. How do these air masses move? MARITIME POLAR CONTINENTALPOLAR MARITIMEPOLAR Jet Stream That’s why weather generally moves WEST to EAST in the U.S. Jet Stream Prevailing Westerlies Prevailing Westerlies MARITIMETROPICAL MARITIMETROPICAL CONTINENTALTROPICAL

  7. What happens when air masses meet? • Air masses don’t mix easily. • The line between air masses is called a front.

  8. COLD FRONTS

  9. WARM FRONTS

  10. Watch the BrainPop video on “Weather” and write down 2 things you learned.

  11. Use your textbook (pg.133-135) to fill out the chart.

  12. Compare/Contrast Chart - Types of Fronts

  13. Compare/Contrast Chart - Types of Fronts

  14. Compare/Contrast Chart - Types of Fronts

  15. Compare/Contrast Chart - Types of Fronts

  16. High Pressure H Low Pressure L Warm Front Surface Map (Fronts & Precipitation) Precipitation Occluded Front Cold Front Stationary Front

  17. Temperature Map

  18. High Pressure H Low Pressure L Warm Front H L What will happen to the weather in Little Rock? Which direction is the warm front moving? 19°C 12°C 14°C 25°C 20°C Monday Weather Little Rock, AR Sun & clear skies Cool = 15°C Tuesday Weather Little Rock, AR Clouds & Rain Warmer = 21°C Wednesday Weather Little Rock, AR Partly Sunny Warmer = 26°C 28°C 21°C 15°C 26°C 30°C Occluded Front Cold Front Stationary Front

  19. High Pressure H Low Pressure L Warm Front What will happen to the weather in Nashville? Which direction is the cold front moving? 10°C 8°C 11°C 10°C 18°C Saturday Weather Nashville, TN Sunny Cool = 10°C Friday Weather Nashville, TN Thunderstorms Cooler = 15°C Thursday Weather Nashville, TN Partly Sunny Warm = 20°C 15°C 10°C 20°C Occluded Front Cold Front Stationary Front

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