Where does our wind come from WIND Vocab

Where does our wind come from? WIND

Vocab � Wind- the horizontal movement of air from an area of high pressure to an area of low pressure. � Anemometer- has three to four cups mounted on spokes that spin, measures wind speed. � Wind-chill factor- increased cooling caused by wind. � Local Winds- winds that blow over short distances

� Sea breeze- a breeze that blows in from an ocean or lake � Land Breeze- flows from land out to sea � Global Winds- blow in a specific direction over a long distance. � Coriolis Effect- the curving of wind by the earths rotation. � Latitude- the distance from the equator. , measured in degrees � Jet Streams- about 10 km above earth. Blow west to east about 200 km to 400 km.

What is Wind � Winds are caused by differences in air pressure �It occurs when warm air rises and cold air moves under it.

Local Winds � Caused by the uneven heating and cooling of the earth’s surface within a small area. Global Winds Occur in the same way local winds do however they are over a larger area.

Coriolis Effect � The Earth moves from West to East very quickly � This movement causes the convection currents to move to the west

Global Convection Currents � Warm air rises at the equator and sinks at the poles � This causes a giant convection current, and happens in 3 zones �The Hadley Cell which is near the tropics �The Ferrell Cell which is near the temperate area �The Polar cell near the poles

Wind Belts � Doldrums � � Little or no wind near equator due to air heating quickly � Horse Latitudes � Steady wind between Equator and 30 degrees � Prevailing westerlies � Moves from west to east. � 30 degrees North or South, of calm wind. Due to sailors threw horses overboard due to lack of food Trade Winds Between 30 and 60 degrees � Polar easterlies- move from the east above 60 degrees. Meets the Prevailing Westerlies

Jet Streams � Jet Streams. Constant fast moving air about 10 km above the earth � Moves above the wind cells � 2 jet streams �The polar stream- in between Ferrell and Polar cells �The subtropical stream – in between the Ferrell and Hadley Cells