Local and Global


Wind - the movement of air from areas of high pressure to low pressure

Local Winds - Local Winds are winds that travel over small or short areas

Sea Breeze- A sea Breeze is a wind that blows from an ocean or lake towards land - these usually happen during the day

Land Breeze- A Land Breeze is a wind that blows from land towards a body of water - these usually happen at night

Global Winds - Global Winds are winds that travel over a large area

What Causes Wind?

The unequal heating of earths surface and differences in air pressure causes wind.

How Are Local Winds Created?

Local Winds are created by the unequal heating of Earth's surface within a small ares.

How Are Global Winds Created?

Like Local Winds, Global Winds are created by the unequal heating of Earth's surface but Global Winds only happen over large areas.

Global Convection Currents

Temperature changes between the equator and the poles cause big convection currents. Warm air rises at the equator and cold air sinks at the poles. Air pressure is lower near the equator but near the poles, air pressure is higher. This change in air pressure causes winds to blow from the poles to the equator. These air movements cause global winds.
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Warm air rises which creates low pressure. Cool air moves into the area and is warmed very fast by the warm air, and then the cool air rises. Areas near the equator with very little wind or no wind are called Doldrums.
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Trade Winds

Trade Winds is the cold air over the horse latitude. It makes high pressure. The winds the blow towards the equator are turned west by the West Coriolis affect. winds in the Northern Hemisphere are between 30 degrees North latitude. In the southern Hemisphere between 30 degrees South and the equator the Winds blow from The South East.

Prevailing Westerlies

In the middle latitude between 30 degrees and 60 degrees North and South winds that blow toward the poles are turned toward the east by the Coriolis effect. They blow from West to East so they are called Prevailing Westerlies.

Jet Streams

10 Kilometers above Earths Surface are high speed winds called Jet Streams. Jet Streams are over 100 kilometers wide but only a few kilometers deep. They usually blow from West to East at speeds of 200 to 400 kilometers per hour.