Global and Local Winds

By: Anna Vumback

Winds

Wind is the perceptible natural movement of air, especially in the form of the current of air blowing from a particular direction.


Wind is the movement of air caused by differences in air pressure.

Local Winds

Local winds are winds that move short distances and blow in any direction.


Local winds are caused by geographic features that produce temperature differences.


Sea breezes occur during the day because there is high pressure over the ocean and low pressure over land due to uneven heating of the Earth's surface. This causes the air to move from the ocean to land.


Land breezes occur at night because there is low pressure over the ocean and high pressure over land due to uneven heating of the Earth's surface. This causes the air to move from land to the ocean.

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Global Winds

Global winds are a combination of the Coriolis Effect and pressure belts.


Global winds are caused because of pressure belts. The cold air from the poles sinks while the warm air from the equator rises and creates a convection current.

Horse Lattitudes

Horse Latitudes occur at every 30 degrees latitude. The winds are very weak here. Most of the deserts are located here because of the dry air. When ships were heavy, the would throw the horses over into the ocean; that is how it got its name.

Trade Winds

Trade winds blow from 30 degrees almost to the equators. They were called trade winds because sailors traded in this area.

Prevailing Westerlies

Prevailing westerlies belts are found between 30 and 60 degrees latitude. They flow towards the poles from west to east carrying most air over the United States.

Polar Easterlies

Polar easterlies belts are found between the poles and 60 degrees latitude. They are formed by cold sinking air moving through the poles which creates cold temperatures.