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Bell Ringer: February 26th • What are the layers of the Earth? • Update your ToC! 2-26-14 12 Air Mass Notes 2-26-14 13 Review Packet (3 pages) Air Masses Chapter 16 section 2 S6E4.b – Relate unequal heating of land and water surfaces to form large global wind systems and weather. S6E4.c – Relate how moisture evaporating from the oceans affects the weather patterns and the weather events such as hurricanes. Air Masses Air mass – is a large body of air where temperature and moisture content are similar throughout. Moisture content and temp are determined by the area over which the air mass forms called source regions. Represented on maps by two-letter symbols; first letter – moisture content, second letter - temperature Symbols C = continental (land) M = maritime (water) P = polar, cold T = tropic, warm • Continental polar (cP)- • cold winter weather to the US • summer brings cool, dry weather. • Maritime polar (mP) • Cool, moist weather (rain and snow) • from the Northern Pacific and Atlantic oceans. • Maritime tropical (mT) • Warm waters of the Pacific and Atlantic Ocean. • Warm, humid, moist weather • Summer - storms • Continental tropical (cT) • brings clear, dry, hot weather into the US Air Masses of North America Review 1. What are the major air masses that influence the weather in the United States? 2. What is one source region of a maritime polar air mass? 1. Continental polar, maritime polar, maritime tropical, and continental tropical. 2. The North Pacific and the North Atlantic Oceans. Review 3.Why does the Pacific Coast have cool, wet winters and warm, dry summers? 3. Cool, wet winters are affected by a maritime polar air mass. Summers are affected by a dry continental air mass.