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Chapter 8

Chapter 8. Section 3-5 (section 1-2 info is in your Water Cycle Presentation). Section 3 Air Masses- a huge body of air that has similar temperature, humidity, and air pressure at a given height. Types of air masses: Maritime Tropical Maritime Polar Continental Tropical Continental Polar

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Chapter 8

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  1. Chapter 8 Section 3-5 (section 1-2 info is in your Water Cycle Presentation)

  2. Section 3 Air Masses- a huge body of air that has similar temperature, humidity, and air pressure at a given height. Types of air masses: • Maritime Tropical • Maritime Polar • Continental Tropical • Continental Polar Maritime-over the ocean, humid Continental-over land, low humidity Tropical-warm Polar-cold

  3. How air masses move- • Prevailing Westerlies- major wind belt over US, usually west to east. • Jet Streams- high speed air masses embedded in the westerlies. • Fronts- the boundary where two air masses meet.

  4. Types of Fronts • Cold fronts- cool, dense air

  5. Warm fronts- warm, less dense air

  6. Stationary fronts- when cold and warm air meet, neither one can move

  7. Occluded fronts- where a warm air mass is caught between two cold air masses

  8. Section 4 Storms! • A violent disturbance in the atmosphere. • Thunderstorms with heavy precipitation, including thunder, the sound of an explosion, and lightning, an electrical charge. • Tornadoes- a rapidly whirling, funnel-shaped cloud over land that reaches down from a storm cloud to the earth. • Snow storms- large amounts of precipitation in the form of snow. • Hurricanes-tropical cyclone, which is a swirling center of low air pressure, winds of 119 kph at least, begins over water, the “eye” of a hurricane is the calm inside the middle. • Floods- after a major downpour of rain, flash floods can occur.

  9. Section 5 Predicting Weather Meteorologist- scientists who study the causes of weather and try to predict it. They use maps, charts and computers to forecast the weather. Reading a weather map: Symbols, color for temperature and lines are used to show the direction of winds, fronts, etc.

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