Air MassesSource RegionCombinations of Source RegionsFrontsGEO 155 1st Edition Lecture 11Last Lecture Hurricane MovieOutline of Current Lecture I. Air Massesa. What are theyb. Source Regionsc. Characteristics and TypesII. Frontsa. Warm Frontb. Cold Frontc. Occluded Frontd. Stationary FrontCurrent LectureAir MassesAn air mass is a large mass of air with uniform temperature and humidity- Usually 1000km- It is uniform horizontallySource Region- Place where an air mass takes on its characteristics1. Polar (P)2. Tropical (T)3. Continental (c)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.4. Maritime (m)Combinations of Source Regions1) cP – cold, dry, stable2) mP – less cold, humid, less stable3) cT – hot, dry, unstable4) mT – less hot, very humid, very unstableFrontsi. Warm Fronta. Occurs when a warm front moves over a cold air mass and rises due to frontal uplifi. Forms stratus cloudsii. May lead to rain or snow depending on the intersection of the front at the boundaryon the ground between the air masses (either cold or warm)ii. Cold Front a. Occurs when a cold front moves over a warm air massb. The cold front is more dense so it pushes the warm air out of the wayi. Creates cumulus cloudsii. More precipitation than the warm frontiii. Steeper front – precipitation lasts for a shorter timeiii. Occluded Fronta. Occurs when a cold front meets a warm fronti. More intense precipitationii. Cold front moves faster than the warmiii. Once this front passes, there are clear skies but the cold air remainsiv. Stationary Fronta. Occurs when a warm air mass sits next to a cold air mass, but they never overlap and there isno uplifb. Warm air may move slightly over the cold air
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