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Winds (7.6)

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  1. Winds (7.6)

  2. Winds are caused by differences in air pressure. They move from high pressure areas to low pressure areas. The sun causes different air pressure therefore the ultimate source of energy that powers the wind. What creates wind? Wind Notes Chapter 7.6

  3. Cold Air Warm Air High Pressure Low Pressure More Dense Less Dense The molecules like to move to a less crowded area. Their movement causes wind. What creates Wind? L H

  4. Wind speed is measured using an anemometer. Is measured using a wind vane or wind sock. Measuring Wind Wind Speed Wind Direction L

  5. The name of the wind tells you where the wind is coming from. North wind comes from the North. Measuring Wind N W E S L H Location A Location B West wind blows from the west to the east. Name: West wind Wind direction: East

  6. N W E S East Wind Blows West L H Location B Location A Location A H North Wind Blows South L Location B

  7. N • What is the name of Each wind • What Direction is the wind blowing? W E S A. B. Northwest Wind Southeast West Wind East A. B. A. B. Northeast Wind Southwest South Wind North A. B.

  8. What type of air pressure creates rain? Low air pressure creates rain because all the water in the air rises and then cools creating rain clouds.

  9. Local winds are winds that blow over short distances and are caused by unequal heating of Earth’s surface within a small area. Ex: Sea breeze, land breeze, Local Winds

  10. Sea Breeze

  11. Land Breeze

  12. Mountain-ValleyBreezes

  13. Compressional Heating Winds (Santa Ana Winds, Chinooks, Foehn Winds)

  14. Santa Ana WindsSan Diego, October 2003

  15. Global Winds • Winds that blow steadily from specific directions over long distances. • caused by unequal heating of Earth’s surface.

  16. Coriolis Effect The effect of Earth’s rotation on the direction of winds and currents. Due to the spinning of the earth wind blows to the east and west instead of North and South.

  17. Strong polar winds due to low friction Polar Easterlies Polar Easterlies • Wind belts that extend from the poles to 60° latitude • Formed from cold sinking air moving from the poles creating cold temperatures

  18. Westerlies • Wind belts found between 30° and 60° latitude • Flow towards the poles from west to east carrying moist airover the Unites States Westerlies

  19. Trade Winds • Winds that blow from 30° almost to the equator • Called the trade winds because of their use by early sailors Trade Winds

  20. Some of the air moves back towards the equator as it sinks... • Tradewinds: Where do you think they got their name? Who were these winds important to?

  21. Doldrums • Located along the equator where no winds blow because the warm rising air creates and area of low pressure Doldrums

  22. There was an area that sailors avoided with their lives... • THE DOLDRUMS... is the area around the equator where the wind completely dies out... which meant death as soon as the fresh water ran out.

  23. Horse Latitudes • Occur at about 30° north and south of the equator where the winds are very weak • Most deserts on the Earth are located here because of the dry air Horse Latitudes Horse Latitudes

  24. Jet Stream • The jet streams are narrow belts of high speed winds that blow in the upper troposphere and lower stratosphere • Separates warm air from cold air • West to east

  25. Isobaric Chart Showing the difference in air pressure for the United States.

  26. High Pressure, Low Pressure combined with Local and Global winds is what creates weather. Wind video 15 min

  27. Question 1 • What causes winds?

  28. Answer • Winds are caused by the uneven heating of Earth’s surface, which causes pressure differences

  29. Question 2 • What are the three types of global winds?

  30. Answer • Polar Easterlies • Westerlies • Trade Winds

  31. Question 3 • What is the difference between a land breeze and a sea breeze?

  32. Answer • Sea breezes occur during the day when the land is warmer than water and a land breeze occurs at night when the water is warmer than land

  33. High Pressure, Low Pressure combined with Local and Global winds is what creates weather. Wind video 15 min