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List of Category 4 Atlantic hurricanes : ウィキペディア英語版 | List of Category 4 Atlantic hurricanes
Category 4 hurricanes are tropical cyclones that reach Category 4 intensity on the Saffir-Simpson Hurricane Scale. Category 4 hurricanes that later attained Category 5 strength are not included in this list. The Atlantic basin includes the open waters of the Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico. Category 4 is the second-highest hurricane classification category on the Saffir-Simpson Hurricane Scale, and storms that are of this intensity maintain maximum sustained winds of 113–136 knots (130–156 mph, 209–251 km/h). Based on the Atlantic hurricane database, 95 hurricanes have attained Category 4 hurricane status since 1851, the start of modern meteorological record keeping. Category 4 storms are considered extreme hurricanes. Hurricane Ike, which was a Category 4 storm, brought on a 24 ft storm surge, the third greatest storm surge ever recorded (after Hurricane Katrina and Hurricane Camille, respectively). ==Statistics== Category 4 hurricanes have maximum sustained winds of 113–136 knots (130–156 mph, 209–251 km/h). "Sustained winds" refers to the average wind speed observed over one minute at a height of 10 meters (33 ft) above ground. Gust can be 30% higher than the sustained winds. Mobile homes and other buildings without fixed structures can be completely destroyed, and the lower floors of sturdier structures usually sustain major damage. In addition to the winds, the cyclones generally produce a storm surge of 13–18 feet (4–5.5 m) above normal, potentially causing major beach erosion. Heavy, irreparable damage and/or near complete destruction of gas station canopies and other wide span overhang type structures are also very common, and mobile and manufactured homes are often completely destroyed. Low-level terrain may be flooded well inland, as well. In addition, Category 4 hurricanes are very often Cape Verde type hurricanes. Cape Verde hurricanes are usually the strongest, and their track sometimes points them towards the United States, or other land. Studies have shown that the number of Category 4 and 5 hurricanes nearly doubled in occurrence in from 1970 to 2004. Also, due to growing population in major coastal cities, many areas have become more vulnerable to strong hurricanes, especially categories 4 and 5.〔(weather.com - Vulnerable Cities: Index )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「List of Category 4 Atlantic hurricanes」の詳細全文を読む
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