Winds & Air Pressure Centers Page 11 Winds & Air Pressure Centers Draw arrows to show the wind pattern around a High & Low L H

Page 11 Top View Ground View

Warmer Cooler Less dense More dense Sinking Rising Clouds No clouds Characteristic Low Pressure High Pressure Warm or Cold Air is less or more dense Air rising or sinking Clouds or no clouds Warmer Cooler Less dense More dense Sinking Rising Clouds No clouds Page 11

CCW CW Towards Away Convergent Divergent Cyclone Anticyclone Characteristic Low Pressure High Pressure CW or CCW Winds towards or away from center Winds Convergent or divergent Cyclone or Anti cyclone CCW CW Towards Away Convergent Divergent Cyclone Anticyclone Page 11

Page 11 Top View Review Ground View

Density & Air Pressure increases Page 11 increases As air temperature _________, density _________ and pressure ________. Low pressure- LoW = Warm & Wet (rain, snow/ humid) Hurricanes & Tornadoes High pressure- Cool & Dry (fair weather) decreases decreases counterclockwise & into clockwise & out

Questions on Page 12 Page 12 2 3 1 2 3

Planetary Wind Belts of the Earth Page 13 Planetary Wind Belts of the Earth The rotation of the Earth creates belts of winds on the Earth’s surface This creates convection cells of air moving between latitudes that we call Hadley Cells. 1. Where winds from 2 adjacent belts meets, the air rises and rains develop (Low Pressure). 2. Where winds diverge, the air is sinking so it is very dry (High Pressure). 8

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Hadley Cells Page 13 10

Planetary Wind Belt Page 15 of the ESRT What latitudes are zones of convergence? 0° or Equatorial region 60° North & South What latitudes are zones of divergence? 30° North & South 90° North & South Polar regions Page 13 11

Zones of Convergence- Winds Divergent 0º, 60º N & S (wet) 30º N&S, 90º N&S (dry) 12

Zones of Convergence 13

Zones of Divergence High Pressure= Dry Air= Arid Climates 14

Questions on Page 13 Page 13 1 3 2

Sea Breezes & Land Breezes Page 14 Warm less dense air rises Remember Specific Heat!!! Water has a higher specific heat than land so it takes longer to heat up and longer to cool down. Cool more dense air sinks Cool more dense air sinks Warm less dense air rises