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Starter. Read page 442 and the “Types of Air masses” paragraph on 443. What is an air mass? How do you think air masses can affect our weather?. Air Masses and Fronts. Standards, Goals and Essential Questions.

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  1. Starter Read page 442 and the “Types of Air masses” paragraph on 443. • What is an air mass? • How do you think air masses can affect our weather?

  2. Air Masses and Fronts

  3. Standards, Goals and Essential Questions S6E4a: Demonstrate that land and water absorb and loose heat at different rates and explain the resulting effects on weather patterns. Goals: Compare and contrast the types of breezes, air masses and fronts Essential Questions: 1. How is a land breeze different from a sea breeze? 2. How can air masses change the weather in an area?

  4. Land heats up and cools down faster than water. As a result we have weather is affected! Uneven heating

  5. Breeze A Blast of cool air

  6. In the Day time, Land heats up quickly The air above land is warmer and rises Sea Breeze- cool air comes from water to land Sea Breeze

  7. At Night time the land has cool off. The water is still warm (cools slowly) The warm air is above water and cool air is above land The cool air goes from land towards water. Land Breeze

  8. Air masses are huge chunks of air. They can be warm, cold, humid or dry. They change the weather in a place when they pass by Air masses

  9. Front A front is the place where two air masses meet. It usually changes weather

  10. Comparing and Contrasting • As you read, compare and contrast the four types of fronts by completing a table like the one below. How It Forms Types of Weather Front Cold front A cold air mass overtakes a warm air mass. Clouds, possibly storms with heavy precipitation A warm air mass overtakes a cold air mass. Warm front Clouds, light precipitation Stationary front Cold and warm air masses meet, but neither can move the other. Clouds, precipitation A warm air mass is caught between two cold air masses. Occluded front Clouds, precipitation

  11. Closing • Land heats up and cools down faster than water. How does this fact explain the formation of sea breezes and land breezes?

  12. 2. Examine pictures and decide if a sea breeze or land breeze is present in the picture? Justify your answers

  13. How do air masses affect our weather? Explain and justify answers. You must use evidence from today’s lesson.

  14. Air Pressure and Temperature

  15. In which direction does a sea breeze move? a. Toward the land b. Toward the sea c. up d. down 2. On the weather forecast, the meteorologist reports that a cold front is coming into GA. What kind of weather can we expect? a. a lot of sun shine b. lots of clouds and a chance of a storm c. Very little precipitation d. a lot of sunshine then little rain 3a. In the day time when the sun is out which of the following will heat up quickly? Land or Water b. Which will cool down faster? 4. When two air masses run into each other and neither moves, what type of front should you expect? 5. Describe the movement f warm air and cold air when convection currents occur in the atmosphere. Starter- Mini Quiz

  16. Roles • Yellow- Group facilitator makes sure group is following directions and completing lab correctly. 2. Green: recorder Writes responses down 3. Red: Reporter Answers the questions for the table during the discussion. Must understand all the answers.

  17. Standard, goals and essential question • S6E4 b. Relate unequal heating of land and water surfaces to form large global wind systems and weather events such as tornados and thunderstorms. Goals: 1. Investigate the relationship between air temperature and air pressure. 2. Relate the movement of air masses to changes in weather. Essential Question: How are temperature and pressure related? How does air pressure affect our weather?

  18. Lab Investigation How does the pressure change with temperature changes?

  19. Results The Colder balloon shinks Less space More pressure since colder things are heavier The warmer balloon gets bigger More space Less pressure because the particles have more room to move around

  20. What does this mean? Warm air is less dense and has low pressure (warm air will rise since it is less dense) Cold air is more dense and has high pressure (cool air will sink fall since it is more dense)

  21. H L H L H L H Pressure Differences Create Wind Air moves from higher toward lower pressure

  22. Wind and heat Uneven heating from the sun creates different air pressures and this creates wind!!!!

  23. Pressure and Weather Greater pressure difference create stronger winds.

  24. Forecasting Tip Happy Lousy

  25. Closing Table Discussion: • How are air temperature and air pressure related? • Uneven heating of Earth’s atmosphere is very important. How will weather be affected If the Earth’s atmosphere was heated evenly?

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