by: Elena

What is Wind

Wind is a sideways movement of air. The air moves from a high pressure place to a low pressure place. Did you know that the wind is named by the direction it come from? For example, if the winds come from the north, they are called Northern Winds. If they are coming from the west, they are called Western Winds.

What Causes Wind

They are caused by the differences of air pressure.

Local Winds

Local winds are winds that cover small areas of Earth. They are caused by the unequal heating of earth's surface in a small area. There are two types of local winds, Sea Breezes and Land Breezes.

Sea Breezes and Land Breezes

Sea breezes occur in the daytime and they blow from sea to land. During a sea breeze, the sea is cooler and the land is warmer. The sea cools of and warms up slower than the land.

Land Breezes occur in the evening and blow from land to sea. During the land breeze, the sea is warmer and the land is cooler. The land cools off and warms up faster than the sea.

Global Winds

Like Local Winds, Global Winds are created by the unequal heating of earth's surface, just in a large area.They blow over long distances and never change directions. Earth's rotation makes the Global Winds curve. The way winds curve is called the Coriolis Effect. The Coriolis Effect makes winds in the Northern Hemisphere curve to the right and the Southern Hemisphere to curve to the left.

Global Wind Belts

The major Global Wind Belts are the trade winds, polar easterlies, and the prevailing westerlies. Wind Belts circle the Earth. Between the Wind Belts are calm areas.

Trade Winds: Trade winds are global winds that blow from the Northern Hemisphere toward the Equator from 30 degrees north latitude. Sailor use these winds to help them move their cargo to other counties to trade stuff.

Prevailing Westerlies: These winds lie between 30 and 60 degrees and blow from the west, that is why they are called Prevailing Westerlies.

Polar Easterlies: They blow from the north to the south pole, then curve eastward.

Jet streams: They are high-speed winds that blow at the top of the troposphere. Airplanes use these winds to travel because they go faster while saving fuel!

The calm areas around Earth are the Doldrums and the Horse Latitudes.

Doldrums: These winds lie on the equator and are weak.

Horse Latitudes: These winds are at 30 degrees north and south latitude, and are weak.