GEO 211 1st Edition Lecture 30 Outline of Last Lecture I Air masses that affect North America A Continental Arctic CA B Maritime Polar mP C Continental Polar cP D Continental tropical cT E Maritime tropical mT F Fronts Warm front Overrunning G Cold front H Occluded front Two types o Cold type o Warm type I Stationary front Outline of Current Lecture II Chapter 12 Middle latitude cyclones Low pressure system in middle latitudes Usually associated with fronts Also called 1 Wave cyclones 2 Extra tropical cyclones A Idealized life cycle of a mid latitude cyclone figure 12 1 1 Cyclogenesis before storm 2 Birth early stage 3 Mature stage open stage 4 Occluded stage 5 Dissipation stage cut off cyclone 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 Current Lecture II Chapter 12 Middle latitude cyclones Low pressure system in middle latitudes Usually associated with fronts Also called 1 Wave cyclones 2 Extra tropical cyclones A Idealized life cycle of a mid latitude cyclone figure 12 1 1 Cyclogenesis before storm Begins at stationary front Winds blow parallel from opposite directions 2 Birth early stage Development of frontal wave called incipient cyclone 3 Mature stage open stage Developed mid latitude cyclone Between fronts is the warm sector Cyclonic flow is strong System has a very wide diameter covers large land area 4 Occluded stage When cold front overtakes warm front Point of occlusion where 3 fronts join is called triple point New wave secondary low forms 5 Dissipation stage cut off cyclone Energy from surface is cut off System gradually disappears
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