Chapter 10 cyclones.docx

Chapter 10 cyclones.docx - Chapter 10 extratropical...

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Chapter 10: extratropical cyclones forming east of the rocky mountains I. Extratropical cyclones are large swirling storm systems that form along the jet stream between about 30-70 degrees latitude. Cyclones are the parent storms from which much of the severe weather of the middle latitudes develops. The entire life cycle of an extratropical cyclone can span several days to well over a week. a. The center of a cyclone is a coincident with a center of low pressure. Air flows counterclockwise around a cyclone so that warm air flows northward east of the cyclone center and cold air flows southward west of the cyclone center. b. The tail of the comma cloud on the satellite image consists of a line of clouds that typically produce showers and thunderstorms. The head of the comma consists of clouds that depending on the season can produce rain, ice, pellets, freezing rain, and/or snow. c. Cyclones preferentially form in 5 locations in north America. i. Just east of the rocky mountains in the central united states particularly in eastern Colorado ii. Just east of the Canadian Rockies particularly near southern alberta iii. Just off the texas-louisiana coastline along the gulf coast of the united states iv. Along the east coast of the united states, particularly near North Carolina v. Over the Gulf of Alaska and the north Pacific Ocean II. The initial development of the cyclone a. A cyclone appears as a center of low pressure on surface charts. The cloud patterns associated with a cyclone develop during and after the time that the center of low pressure forms b. Waves in the jet stream are always present in the atmosphere. They are generated in
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