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The 1956 Atlantic hurricane season featured a low number of tropical cyclones, although every tropical storm and hurricane affected land. There were eight tropical storms, half of which became hurricanes. Two of the hurricanes strengthened to the equivalent of a major hurricane, which is a Category 3 or greater on the Saffir-Simpson Hurricane Scale. The strongest hurricane of the season was Greta, which was also the final storm of the year; it was an unusually large storm that produced high waves from Florida to the Lesser Antilles. The most damaging storm was Hurricane Betsy, which destroyed 15,000 houses and left $40 million in damage in Puerto Rico. Betsy was also the deadliest of the season, having killed 18 in the French West Indies, 2 from a shipwreck in the Caribbean Sea, and 16 in Puerto Rico. Tropical Storm Dora struck Mexico in September and killed 27 people. The season officially started on June 15, although an unnamed storm developed three days prior in the Gulf of Mexico; the storm alleviated drought conditions in the south-central United States. Hurricane Anna developed in late July and hit Mexico. Tropical storms Carla and Ethel both formed near the Bahamas and moved northeastward until dissipating. The lone hurricane that hit the contiguous United States was Hurricane Flossy. It developed in the western Caribbean and moved across much of the southeastern United States, causing $24.8 million in damage and 15 deaths. There were also several tropical depressions, as well as one subtropical cyclone, in the season. ==Season summary== The season officially began on June 15, the date that the Weather Bureau office in Miami, Florida, under the direction of Gordon Dunn, began daily monitoring of all tropical disturbances and cyclones across the northern Atlantic Ocean. The agency had access to the Hurricane Hunters, a fleet of aircraft that obtain data by flying into storms. The Weather Bureau, in collaboration with other agencies, began a five–year project in 1956 to obtain and analyze data on the structure of hurricanes. The season officially ended on November 15. There were a total of eight tropical storms during the season, one of which was unnamed. Of the eight storms, four were hurricanes. Compared to the average activity from the previous two decades, the season saw two fewer tropical storms and one fewer hurricane. The season's activity was below normal despite average sea surface temperatures and a normal number of tropical waves. Instead, the inactivity was the result of the subtropical ridge being located further south than normal, which decreased the atmospheric instability across much of the basin. Such a pattern was different from the more active 1954 and 1955 seasons. Several tropical depressions formed that did not attain tropical storm status, many of which formed beneath an unfavorable upper-level trough.〔 The season's activity was reflected with a cumulative accumulated cyclone energy (ACE) rating of 54, which is categorized as being "below normal". ACE is, broadly speaking, a measure of the power of the hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. ACE is only calculated for full advisories on tropical systems at or exceeding 34 knots (39 mph, 63 km/h) or tropical storm strength. Subtropical cyclones are excluded from the total. 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「1956 Atlantic hurricane season」の詳細全文を読む スポンサード リンク
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