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20.3 Severe Storms Whirling tropical cyclones that produce winds of at least 119 kilometers per hour are known in the United States as hurricanes. Occurrence of Hurricanes • Most hurricanes form between about 5 and 20 degrees north and south latitude. The North Pacific has the greatest number of storms, averaging 20 per year. Three-stage pattern of change in birth rates and death rates that occurred during the process of industrial and economic development of Western Nations. 13: What is the difference between a maximum lifetime and life expectancy? Maximum lifetime is the genetically determined maximum possible age to which an individual of a species CAN live. Major lake-effect winter storms were discussed in Chapter 20. Away from major lakes, cold continental air masses usually pro-554 UNIT 7: THE DYNAMIC ATMOSPHERE FIGURE 23-3. Thunderstorms are most common in the southeastern states where warm, humid conditions occur and cool continental air masses clash with tropical air masses 20 30 40 40 30 30 ... In contrast to the studies just mentioned, but in association with local weather patterns, Neotropical migrants breeding in the Pacific Northwest had lower (rather than higher) reproduction in El Niño years (Nott et al. 2002). Together these various studies demonstrate the role of ENSO in the population dynamics of Nearctic-Neotropical ...