Do Now – In BindersDescribe how wind is created.What is the relationship between density and pressure?

What happens to air pressure as I hike up a mountain?

What instrument measures air pressure?

What roles do composition, structure, and properties play in our atmosphere?

Coriolis EffectBecause the Earth rotates, and consists of a

mixture of land and sea, the Coriolis Effect exists

The Coriolis Effect is the movement of particles (such as air) to the right in the Northern Hemisphere

How about the South?They move to the left

Coriolis Effect

Global WindsGlobal wind patterns are caused by:

Coriolis EffectThe land and sea makeup of Earth

Warm Moist Air Rises

Warm Moist Air Rises

Cool Dry Air Sinks

Cool Dry Air Sinks

Warm Moist Air Rises

Cool Dry Air Sinks

Cool Dry Air Sinks

Cold Moist Air Rises

Cold Moist Air Rises

Warm Moist Air Rises

Cool Dry Air Sinks

Cool Dry Air Sinks

Cold Moist Air Rises

Cold Moist Air Rises

Very Cold Air Sinks

Very Cold Air Sinks

Warm Moist Air Rises

Cool Dry Air Sinks

Cool Dry Air Sinks

Cold Moist Air Rises

Cold Moist Air Rises

Very Cold Air Sinks

Very Cold Air Sinks

H

L

H

H

H

L

L

H

L

H

H

H

L

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Wind Moves from HIGH

to LOW

Objects are deflected to

the RIGHT in the

Northern Hemisphere

Remember!Wind gets its name

from thedirection it is blowing

FROM!

Northern Wind PatternsPolar Easterlies

90 – 60 latitude from the eastPrevailing Westerlies

60 – 30 latitude from the westTrade winds

30 – 0 latitude from the East

Latitude NicknamesHorse Latitudes

30 latitudeNamed because the boats stalled and the

horses had to go!Doldrums / Intertropical Convergence Zone

(ITCZ)EquatorTrade winds converge from north and southNamed because boats also got stranded here

Jet StreamsJet Streams form at

latitudes where wind systems come together

High speed westerly winds form high above the surface