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Title: DEVELOPMENT OF AN EXTRATROPICAL CYCLONE
Caption: (a) Air masses, moving in opposite directions along a front, such as the stationary front shown here, provide the temperature contrast for cyclone development. (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, air masses, cyclogenesis, warm fronts, cold fronts, occluded fronts