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Wind

Wind . Causes of wind. How wind develops. Caused by a difference in air pressure due to unequal heating of the atmosphere. Winds are created by… . Heating the air, decreases pressure (warm air rises creating a low pressure)

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Wind

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  1. Wind Causes of wind

  2. How wind develops • Caused by a difference in air pressure due to unequal heating of the atmosphere

  3. Winds are created by… • Heating the air, decreases pressure (warm air rises creating a low pressure) • Cool air rushes in to replace the warm air (cooler dense air, produces high pressure) • As air goes from high to low pressure, winds form.

  4. Coriolis Effect • Coriolis Effect-Rotation of the Earth causes moving air and water to change directions • Northern Hemisphere winds curve to the right • Southern Hemisphere winds curve to the left

  5. 2 types of Winds • Global winds(occur over a large area) • Local winds (occur over a small area)

  6. Doldrums(turn to page 423) • At the equator, surface winds are calm and weak. • Why would these winds be calm and weak? When would this cause a problem?

  7. Trade Winds • 30 degrees North and South of the Equator • Calm winds, few clouds, little rain fall • Warm air rising from Equator cools and sinks They take place in an area known as the horse latitudes(area from equator to 30 degrees latitude in both hemispheres)

  8. Prevailing Westerlies • Strong winds • Located in the belt from 30-60 degrees latitude in both hemispheres • Has an impact on the weather in the USA

  9. Polar Easterlies • Cold, but weak winds • Near the north and south poles • US weather is also influenced by these • Cooling takes place between the 50-60 degree latitude as it approaches the poles

  10. Jet Streams • Discovered in 1940’s • Can be found in the upper troposphere • Strong high speed and high pressure • Moves west to east across the US, moving storms • Also helps airplanes fly from the west coast to east coast

  11. Local Winds • Cover short distances • Blow from any direction • 2 types of Local Winds -Sea Breeze-from sea to land -Land Breeze-from land to sea

  12. Look at Page 420 Sea Breeze Illustration

  13. Look at Page 420 Land Breeze Illustration

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