GEO 155 1st Edition Lecture 11 Last Lecture Hurricane Movie Outline of Current Lecture I Air Masses a What are they b Source Regions c Characteristics and Types II Fronts a Warm Front b Cold Front c Occluded Front d Stationary Front Current Lecture Air Masses An air mass is a large mass of air with uniform temperature and humidity Usually 1000km It is uniform horizontally Source Region 1 2 3 Place where an air mass takes on its characteristics Polar P Tropical T 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 Regions 1 2 3 4 cP cold dry stable mP less cold humid less stable cT hot dry unstable mT less hot very humid very unstable Fronts i Warm Front a Occurs when a warm front moves over a cold air mass and rises due to frontal uplif i Forms stratus clouds ii May lead to rain or snow depending on the intersection of the front at the boundary on the ground between the air masses either cold or warm ii Cold Front a Occurs when a cold front moves over a warm air mass b The cold front is more dense so it pushes the warm air out of the way i Creates cumulus clouds ii More precipitation than the warm front iii Steeper front precipitation lasts for a shorter time iii Occluded Front a Occurs when a cold front meets a warm front i More intense precipitation ii Cold front moves faster than the warm iii Once this front passes there are clear skies but the cold air remains iv Stationary Front a Occurs when a warm air mass sits next to a cold air mass but they never overlap and there is no uplif b Warm air may move slightly over the cold air mass
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