General Circulation of the Atmosphere Hadley Cell Monsoons A monsoon is a term from early Arabs called the Mausin or the season of winds This was in reference to the seasonally shifting winds in the Indian Ocean and surrounding regions including the Arabian Sea Indian Monsoon SW US Monsoon Monsoon Monsoon Origin West African Monsoon Southwest U S Monsoon The Jet Stream A long narrow current of strong winds in the midlatitudes that is generally found in the upper troposphere and lower stratosphere roughly 25 000 35 000 ft 400 250 hPa First became obvious during WWII as high flying aircraft was sped up and slowed down on their missions Strongest can exceed 200 mph Nearly always from the west in midlatitudes B 29s flying westward to Japan Jet Streams are NOT uniform Jet Streams Associated with Horizontal Temperature Gradients Air Masses Maritime Tropical Source Region Continental Polar Source Region Continental Tropical Source Region Maritime Polar Bering Sea Cloud Streets
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