GEOG 111 1st Edition Lecture 25 Outline of Last Lecture I. The Circumpolar Vortex Outline of Current Lecture I. The Circumpolar Vortex (review)II. Wave Cyclonesa. ExampleCurrent LectureI. The Circumpolar Vortex – river of air that meanders around Earth’s polesa. There is much day to day and week to week variability in the character of the CPVb. Ridges and troughs propagate downstreamc. Jet stream – the geographic place in the atmosphere where winds blow the strongesti. Occurs where the north-south temperature gradient is the strongestii. Warm (cold) air is present south (north) of the jet streamiii. Most types of extreme weather develop in the vicinity of the jet stream or occur when the jet stream in an unusual position (e.g. farther north or south than normal)d. Climatology of circumpolar vortexi. Winter/Early Spring1. Fastest winds2. Most expansive (i.e. jet stream closest to Carolina)3. Weather most changeableii. Summer/Early Fall1. Weakest winds2. Most contracted3. Jet stream to the North (in Canada)4. Pressure gradient much weaker5. Weather most persistente. (Climatology continued)i. Summer Season example1. Features (cyclone, ridges, trough) that are much weaker 2. Move slower3. Weather is changing in the North (where the features are located)II. Wave Cyclonesa. Example: March 1993 Superstormi. Several types of extreme weather1. Blizzard- went all the way down to Alabamaa. Incredibly unusual/against climatologyThese 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.2. Severe thunderstorms/tornadoes3. Storm surge- flooding along West coast of Florida4. Cyclone is pushing warm air to the north and vice versaa.
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