Quick DVD: Weather Wind Chp 2 8:05

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Heat Transfers Convection

• Quick DVD Weather Wind Chp 2 805
• Hot Rises
• Cold Sinks
• Caused by density differences
• Hot air expands and gets less dense.
• Cold air contracts and gets more dense.

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A Convection Cell
Cool
Hot
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Lesson 4Air Pressure

• The weight of the air above you. The more air
  that is above you the more pressure you will
  feel.
• Sinking air pushes down more- cold air is usually
  high pressure.
• Rising air pushes down less- hot air is usually
  low pressure.

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Air Pressure
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A Convection Cell
High Pressure
Low Pressure
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Wind

• Wind travels from high pressure to low.
• The gradient between isobars determines the wind
  speed.

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Big Difference in Pressure
(Steep Gradient)
H
L
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Small Difference in Pressure
(Gentle Gradient)
H
L
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H
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Isobars
Slowest Wind
H
Fastest Wind
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Low Pressure Sucks!
L
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L
Slowest Wind
Fastest Wind
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The Coriolis Effect

• The Coriolis Effect deflects things to their
  right in the Northern Hemisphere.
• Caused by the rotation of the Earth.

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H
17
Find where the High Pressure region is.
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• High Pressure flows outward and clockwise (cw)
  (in the N. Hemisphere)

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L
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• Low Pressure flows inward and counterclockwise
  (ccw)(in the N. Hemisphere)