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Tropical Zone – Between 0 and 30 degrees latitude.

Tropical Zone – Between 0 and 30 degrees latitude. Winds are northeasterly in the Northern Hemisphere and southeasterly in the Southern Hemisphere. Also called Trade Winds. Temperate Zone – Between 30 and 60 degrees latitude.

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Tropical Zone – Between 0 and 30 degrees latitude.

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  1. Tropical Zone – Between 0 and 30 degrees latitude. Winds are northeasterly in the Northern Hemisphere and southeasterly in the Southern Hemisphere. Also called Trade Winds.

  2. Temperate Zone – Between 30 and 60 degrees latitude. Winds are southwesterly in the Northern Hemisphere and northwesterly in the Southern Hemisphere. Also called the Westerlies.

  3. Polar Zone – Between 60 and 90 degrees latitude. Winds are northeasterly in the Northern Hemisphere and southeasterly in the Southern Hemisphere. Also called the Polar Easterlies.

  4. Intertropical Convergence Zone ( ITCZ) The zone at the equator where the trade winds from the Northern and Southern hemisphere’s converge. Also called the doldrums because sailors would not get any wind to help them here.

  5. Horse Latitudes – At about 30 degrees north and south this is another windless area that gave sailors havoc. The vertical motion of air in the horse latitudes is downward, while in the doldrums it is upward.

  6. Air diverges (spreads out) at the horse latitudes and converges (comes together) at the doldrums.

  7. Subtropical Highs – Regions of high pressure air found within the horse latitudes.

  8. Polar Front – The distinct boundary between the westerlies and the polar easterlies.

  9. Polar Highs – High pressure areas in the polar regions.

  10. Inertia – The tendency of a motionless object to remain at rest and the tendency of a moving object to continue in the same direction.

  11. Coriolis Force – The curving of winds caused by the earth’s rotation.

  12. Hadley Cell – the circulation cycle of tropical air.

  13. Rossby Waves – Upper troposphere waves.

  14. Jet Stream– A stream of powerful wind that was discovered by B-29 bombers in 1944.

  15. Subtropical Jet Stream - Occurs above the subtropical highs.

  16. Polar Front Jet Stream - Flows through the warm air along the upper edge of the polar front. The kind that moves through Washington.

  17. Tropopause- the topmost boundary of the troposphere.

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