Lecture 13 - Lecture 13: Winds Rossby waves Rossby waves...

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Lecture 13: Winds Rossby waves Rossby waves ar: great waving undulations within: __________ the westerly winds ____________ They occur at the: ________ polar front _______ The Rossby waves bring tongues of cold air southward, with warmer tropical air moving northward. There are three stages to Rossby wave formation. 1. Upper-air circulation begins to gently __ undulate ________ 2. Rossby ____ waves _____ begin to form, with cyclonic and anticyclonic curvature. 3. Strong development produces cells of cold and warm air – high pressure ridges and low-pressure troughs – so the waves are very pronounced. Jet streams Jet streams are ________irregular, concentrated bands of wind_____________________ They are normally 100-300 miles wide and 3000-7000 feet thick. They have core speeds that can exceed 190 mph. They tend to weaken during a hemisphere’s __summer_______ and strengthen during the __winter______ This is because the differences in ___ temperature – and therefore air ___ pressure ____ – are much less throughout a hemisphere in summer than in winter. There are two jet streams: the __ polar _____ jet stream and the ______ subtropical ___ jet stream. The polar jet stream meanders ________between 30 and 70 degrees__________ . It can migrate as far south as ____ texas _________, steering colder air masses into North America, and influencing the path of storms. It demarcates the ________ polar front ______. It also constitutes the Rossby Waves. The subtropical jet stream occurs near the boundary between tropical and midlatitude air. It meanders from _______20 to 50 degrees__________ latitude. T/F: Rossby waves are energy cycles associated with the Hadley cells False- mid upperlatitude T/F Sometimes Rossby waves are gently curving (undulating), sometimes they are very pronounced. True What are true about Jet Streams? A. They weaken in winter and strengthen in summer B. They are irregular, concentrated bands of wind. False C. There are three main jet streams: polar, sub-tropical and mid-latitude D. The farthest south the polar jet stream migrates is Wisconsin E. They are always very close to 60 N or S to the equator F. The Polar jet varies from roughly 30 to 70 N latitude; it can go as far south as Texas False
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Local Winds There are 5 types of local winds: 1. Land and sea breezes 2. Mountain and valley breezes 3. Chinook 4. Santa Ana 5. Katabatic 1. Land and Sea Breezes : occur on coastlines. They are caused by the ___________
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Lecture 13 - Lecture 13: Winds Rossby waves Rossby waves...

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