Winds Section 3 Pages Section 3 Pages

What causes wind? Air moves because of differences in air pressure. Fluids (air) tend to move from areas of high pressure to areas of low pressure. Air moves because of differences in air pressure. Fluids (air) tend to move from areas of high pressure to areas of low pressure.

What causes wind? Wind is the horizontal movement of air from an area of high pressure to an area of lower pressure. All winds are caused by differences in air pressure. Wind is the horizontal movement of air from an area of high pressure to an area of lower pressure. All winds are caused by differences in air pressure.

What causes differences in air pressure? Unequal heating of the atmosphere Convection currents form when Earth’s surface is heated. The cool, dense air has higher air pressure so it flows underneath the warm, less dense air. What is wind? Unequal heating of the atmosphere Convection currents form when Earth’s surface is heated. The cool, dense air has higher air pressure so it flows underneath the warm, less dense air. What is wind?

Measuring Wind Direction Wind direction is measured using a wind vane. The name of the wind tells you where the wind is coming from. A north wind blows from the north to the south. Wind direction is measured using a wind vane. The name of the wind tells you where the wind is coming from. A north wind blows from the north to the south.

Local Winds Winds that blow over short distances Caused by unequal heating of Earth’s surface within a small area Sea breezes and land breezes

Sea Breeze A wind that blows from an ocean onto land Occurs during the day Cool air moves from the sea towards the land forming a sea breeze; pushes the warm air out

Land Breeze The flow of air from land to a body of water Occurs at night Land cools more quickly than water. Cooler air over land moves toward the sea, forming a land breeze; so the warm air over the sea rises.

Monsoons Sea and land breezes over a large region that change direction with the seasons Summer monsoons in South Asia and SE Asia are very important for the crops growing there

Global Winds 1.What produces global winds? 2.What is the Coriolis Effect? Describe the major wind belt and it’s location: 3. Doldrums 4. Horse Latitudes 5. Trade Winds 6. Prevailing Westerlies 7. Prevailing Easterlies 8. Jet Stream

Words Worth Knowing (ISN #18) Wind Anemometer Local wind Sea breeze Land breeze Monsoons Global wind Coriolis effect Latitude Jet stream