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Chapter 9: Weather Chapter 9: Weather FactorsFactors
Section 3: Winds
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What is Wind?What is Wind?Wind – horizontal movement; from
high pressure to lower pressure.◦Caused from differences in pressure
Difference in pressure – caused by unequal heating of the atmosphere.
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Measuring WindMeasuring WindWinds are described by their
direction and speed.Name of wind – Where it comes
from
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Measuring WindMeasuring WindWind speed is measured with an
anemometer.
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Wind-Chill FactorWind-Chill FactorWind-Chill Factor – the increased
cooling caused by wind.
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Local WindsLocal WindsLocal Winds – blow over short
distances.◦Caused by unequal heating of
Earth’s surface within a small area.◦Form only when large scale winds
are weak.
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Local WindsLocal WindsSea Breeze (Lake Breeze) – a local
wind that blows from an ocean or lake.
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Local WindsLocal WindsLand Breeze – flow of air from
land to a body of water.
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Global WindsGlobal WindsGlobal Winds – winds that blow
steadily from specific directions over long distances.◦Created by unequal heating of Earth’s
surface but occur over a large area.
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Global Convection Global Convection CurrentsCurrentsGlobal Convection Currents –
Temperature differences between the equator and the poles produce giant convection currents in the atmosphere.
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Global Convection Global Convection CurrentsCurrentsCoriolis Effect – Earth’s rotation
makes winds curve.
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Global Wind BeltsGlobal Wind BeltsDoldrums – Near Equator; Calm
area; warm air rises; low pressure area
Horse Latitudes – Calm area; falling air; high pressure
Trade Winds – blow from horse latitudes toward the equator
Prevailing Winds – blow away from the horse latitudes toward the poles
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