Chapter 7: Atmospheric Circulations Scales of atmospheric motion Eddies of different sizes  Microscale- chimney smoke, leaves in a corner of a building  Mesoscale- city smoke, a sea breeze/land breeze  Synoptic scale- weather fronts, winter storm

Local Wind Systems Thermal Circulations  Sea breeze  Land breeze Seasonal winds  Santa Ana winds Warm dry, fall season winds  The monsoon Seasonal reversal in winds Wet summer/Dry winter Most pronounced in Asia Does occur in Southwest U.S.

Mountain/Valley Breezes Valley Breezes  Mountain slopes heat up  Air rises along the mountain slopes  Upslope valley breezes  Clouds may form along mountains  At night, slopes begin to cool  Air along slopes sinks into the valleys  Colder air settles into valleys

Desert winds Hot desert air  Haboobs  Dust devils  Dust storms These wind storms are quite common in the deserts….

Focus on “Readings” Eddies and “Air Pockets” Snow Eaters and Rapid Temperature Changes

Global Winds Intertropical Convergence Zone (ITCZ)  Equatorial low pressure, rising air  Doldrums Sub tropical high pressure zones 30°  Horse Latitudes  Sinking air Westerlies  Jet stream winds Polar easterlies  Sinking air

Polar Jet Stream North Pacific High Pressure Equatorial Low Pressure

Polar Jet Stream Pacific High

End of Chapter 7 Key Terms Questions for Review: 1, 4, 5a-b, 6, 7, 8, 9a-b, 10, 11, 12, 13, 14, 15, 16, 17, 18a- c, 19, 20, 22. Questions for Thought/Exploration 7, 9, 10,