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Title: STRUCTURE OF AN EXTRATROPICAL CYCLONE
Caption: Once an extratropical cyclone develops, it is fed by three "conveyor belts" of air: Warm, generally moist air feeds the storm from the south and rises up over a stream of cold air coming from the east; and dry air aloft feeds the storm from the west sinking behind the advancing cold front at the surface. (After Lutgens F. K., and Tarbuck, E. J. 2007. The atmosphere; An introduction to meteorology, 10th ed. Upper Saddle River, NJ: Pearson Prentice Hall)
Keywords: atmosphere, midlatitude cyclones, middle-latitude cyclones, warm fronts, cold fronts, conveyor belts