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PublishJoan Watkins Modified over 8 years ago
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Midlatitude Cyclones (Storms) Extratropical cyclone or wave cyclone or frontogenesis or storm Low pressure area with counter-clockwise circulation. Atmosphere collects water as water vapor in evaporation from oceans, lakes. It is returned via precipitation, often caused by storms.
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Storms Center of intense low pressure with cyclonic circulation and resultant precipitation. Midlatitude Cyclone Hurricane Tornadoes Not thunderstorms, no cyclonic motion.
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Cyclogenesis in Action: Mid-latitude (extratropical) cyclones
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Air Masses Definition: volume of air with same temperature and humidity characteristics Source Regions: where air masses come from. Classification: warm or cold, moist or dry
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Air Masses Affecting North America
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Frontogenesis
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Occluded Front : The Death of a Storm
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Occluded Front
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Weather Maps
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Today’s Weather Map
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Storm Tracks: North America Actual Storm Tracks (1991) Storms (Storm Tracks) generally travel from West to East in North America all year They shift North in summer & South in Winter Average Storm Tracks Moving West To East
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Midlatitude Cyclone Characteristics Motion: these storms move across the midlatitudes at about 30 m.p.h. from west to east as they rotate once around a low pressure center. Size: roughly 1,000 miles in diameter, the largest of storms Lifespan: 3-6 days to develop, 3-6 to dissipate Pressure: center roughly 990-1000 mb (1-2 % drop)
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