What is wind?
Wind is the movement of air caused by differences in air pressure. The greater the difference, the faster the wind moves. Uneven heating of Earth's atmosphere and difference in air pressure cause wind or air movement. Wind is measures by two tools, the anemometer and wind vane. Wind is an important part of our life. That is what wind is!
Global winds are caused by the combination of pressure belts and the Coriolis Effect. The three types of Global winds are polar easterlies, prevailing westerlies, trade winds.
HOW DO GLOBAL WINDS OCCUR?
Pressure Plates - As warm air rises at the equator and moves toward the poles, it cool. As it cools, some of the air sinks around 30* north and south. At the poles, cold air sinks and moves towards the equator. Around 60* north and south, the air begins to heat up and rise. These are pressure plates, one of the reasons Global Winds are created.
Coriolis Effect - Coriolis, the effect tends to move air to the right in the northern hemisphere and to the left in the southern and is important in the formation of cyclonic weather systems.
- Located along the equator where no winds blow because the warm rising air creates and area of low pressure.
THREE TYPES OF GLOBAL WINDS
- Trade winds - Winds that blow from 30゜almost to the equator. They are called trade winds because of their use by early sailors who used these winds to get places and trade
- Jet stream - The jet streams are narrow belts of high speed winds that blow in the upper troposphere and lower stratosphere. It also separates warm air from cold air
- Westerlies - Wind belts found between 30* and 60* latitude. Flows toward the poles from west to east carrying moist air over the United States.
- Local winds are winds that blow over short distances. Local winds can vary in direction and strength.
- Local winds are usually made by the uneven heating of Earth and the difference in air pressure. Also geographic features play a role on local winds.
- Sea breeze's are created by.... High pressure is created over the ocean during the day and low pressure over land due to uneven heating. Air moves from the cool ocean to the land creating a sea breeze.
- Land breeze's are created by.... Low pressure is created over the ocean during the night and low pressure over land due to uneven heating. Air moves from the cool land to the ocean creating a land breeze.