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tornado emergency
A tornado emergency is an enhanced version of the tornado warning used by the National Weather Service (NWS) in the United States, during significant tornado occurrences in highly populated areas. Although it is not a new warning type from the NWS, issued instead within a severe weather statement (or in rare cases, in the initial tornado warning), a tornado emergency generally means that significant, widespread damage is expected to occur and a high likelihood of numerous fatalities is expected with a large, strong to violent tornado. A tornado emergency may also be issued when computer models predict a 100% chance that a powerful tornado will strike a populated area.
Although tornadoes that are classified in damage surveys as "strong" or "violent" (rated EF2-EF5 on the Enhanced Fujita Scale) are capable of significant property damage and loss of life, there have been instances in which these type of tornadoes have resulted in very few to no fatalities; in turn, not all tornadoes of ¼-mile in width or larger produce catastrophic damage (though this is often assumed to be the case). Regardless, people in the path of a large tornado must take immediate safety precautions if they are in or near the projected path of the storm.
== History ==
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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