GEO 211 1st Edition Lecture 30 Outline of Last Lecture I. Air masses that affect North AmericaA. Continental Arctic (CA)B. Maritime Polar (mP)C. Continental Polar (cP)D. Continental tropical (cT)E. Maritime tropical (mT)F. Fronts- Warm front- OverrunningG. Cold frontH. Occluded front- Two types:o Cold typeo Warm typeI. Stationary frontOutline of Current Lecture II. Chapter 12- Middle-latitude cyclones- Low pressure system in middle-latitudes- Usually associated with fronts- Also called1. Wave cyclones2. Extra tropical cyclonesA. Idealized life cycle of a mid-latitude cyclone (figure 12.1)1. Cyclogenesis- before storm2. Birth: early stage3. Mature stage: open stage4. Occluded stage5. Dissipation stage: cut off cycloneThese 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 LectureII. Chapter 12- Middle-latitude cyclones- Low pressure system in middle-latitudes- Usually associated with fronts- Also called1. Wave cyclones2. Extra tropical cyclonesA. Idealized life cycle of a mid-latitude cyclone (figure 12.1)1. Cyclogenesis- before storm- Begins at stationary front- Winds blow parallel from opposite directions2. 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) forms5. Dissipation stage: cut off cyclone- Energy from surface is cut off- System gradually
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