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2002 Veterans Day Weekend tornado outbreak
The 2002 Veterans Day Weekend tornado outbreak was a large, widespread and rare outbreak of storms that occurred from the late afternoon hours on November 9 through the early morning hours on Veterans Day, November 11, 2002. Eighty-three tornadoes hit 17 states. Twelve tornadoes killed 36 people in five states. This ranks as the second biggest outbreak ever recorded in November.
==Autumn tornado season==
The lower Ohio Valley and the South have two tornado seasons, one in the spring and a less intense and more sporadic one in autumn. The states in these regions are truly unique as they are the only places in the entire world with two distinct tornado seasons. During the autumn season, the upper atmospheric dynamics are once again more often conducive for major tornado outbreaks. Upper atmospheric temperatures cool down as the calendar shifts towards winter and jet stream winds increase, as does intensity of low pressure systems. Some of the most destructive severe weather events in USA history have occurred during the secondary season. Unfortunately, many people are not well aware of this secondary season as they are the spring season which can lead to a higher chance of people being caught off guard by severe weather. Many local national weather service offices in the south conduct storm spotter training sessions in the fall and even observe a fall severe weather awareness day in effort to draw more attention to this secondary peak.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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