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Hurricane Rafael (2012) : ウィキペディア英語版
Hurricane Rafael

Hurricane Rafael produced minor damage in the northeastern Caribbean Sea in mid-October 2012. The seventeenth named storm and ninth hurricane of the annual hurricane season, Rafael originated from a tropical wave roughly 230 mi (370 km) south-southeast of Saint Croix on October 12; because the system already contained tropical storm-force winds, it skipped tropical depression status. Though initially disorganized due to moderate wind shear, a subsequent decrease allowed for shower and thunderstorm activity to develop in earnest by October 14. While moving north-northwestward the following morning, Rafael intensified into a Category 1 hurricane. A cold front off the East Coast of the United States caused the system to turn northward and eventually northeastward by October 16, at which time Rafael attained its peak intensity with maximum sustained winds of 90 mph (150 km/h). As the cyclone entered a more stable atmosphere and tracked across increasingly cooler sea surface temperatures, it began extratropical transition, a process the system completed by the following afternoon.
As a disorganized tropical cyclone in the northeastern Caribbean, Rafael produced major flooding across the region. As much as a foot of rain fell across portions of the Lesser Antilles, causing mudslides, landslides, and river flooding. In addition, the heavy rains led to significant crop loss. Sustained winds near hurricane force were recorded on Saint Martin, while tropical storm-force gusts occurred widespread. Lightning activity as a result of heavy thunderstorms caused many fires and power outages. One fatality occurred when a woman in Guadeloupe unsuccessfully attempted to drive her car across a flooded roadway. As Rafael passed just to the east of Bermuda as a hurricane, light rainfall was recorded. Gusts over 50 mph (85 km/h) left hundreds of houses without electricity. Large swells from the system caused significant damage to the coastline of Nova Scotia, while many roads were washed away or obscured with debris, but overall, damage was minimal.
==Meteorological history==

The formation of Hurricane Rafael is attributed to a low-latitude tropical wave that emerged off the western coast of Africa on October 5. The wave remained disorganized until roughly midway between the Cape Verde Islands and Lesser Antilles, at which time a broad area of low pressure developed and convection began to consolidate around it. As a result, the disturbance was introduced into the National Hurricane Center (NHC)'s 48-hour Tropical Weather Outlook with a low chance of tropical development. These chances were subsequently raised as further development occurred, with the system receiving a medium chance of development early on October 10, and a high chance of development as it approached the southern Leeward Islands late the following evening. As the wave crossed into the eastern Caribbean Sea and slowed down, the previously broad and open surface low consolidated and became stacked with the mid-level center. The disturbance was already producing tropical storm-force winds, and as a result, skipped tropical depression status to become Tropical Storm Rafael at 1800 UTC on October 12. At this time, the cyclone was located roughly 200 mi (320 km) south-southeast of St. Croix.
Despite being named, Rafael remained disorganized initially; this was the result of the interaction between an upper-level trough and the cyclone itself. Moderate to strong wind shear dislocated the center of Rafael and the deepest shower and thunderstorm activity. Over the course of the next few days, however, the upper-level trough gradually weakened and backed westward, allowing for the development of an anticyclone atop the tropical storm. Wind shear lessened, allowing the center to become obscured from view and outflow to develop in association with the system. As it began to execute a turn towards the north under the influence of an upper-level trough to its west, a central dense overcast was noted on satellite imagery. Following a series of intensity estimates, Rafael was upgraded to a hurricane around 0600 UTC on October 15, while positioned about 650 mi (1045 km) south of Bermuda, although this intensity was speculated upon until later that afternoon following a hurricane hunters flight into the system.〔
As Rafael moved northward, it continued to intensify rapidly in spite of moderate wind shear. An eye became visible on microwave imagery during the morning hours of October 16, during which time the cyclone attained its peak intensity as a Category 1 hurricane with maximum sustained winds of 90 mph (150 km/h) and a minimum barometric pressure of 969 mb (hPa; 28.61 inHg). By the afternoon hours of that same day, data from an Air Force Reserve reconnaissance aircraft indicated that Rafael was on the verge of a weakening trend, attributed to decreasing sea surface temperatures and higher wind shear. Though the system retained hurricane-force winds, it began to transition into an extratropical cyclone on October 17, a process it completed by 1800 UTC that same day after interacting with a cold front; at the time of the transition, Rafael was positioned well southwest of Nova Scotia. The remnants of the cyclone looped around a larger extratropical low over the north-central Atlantic Ocean for several days prior to dissipating over Portugal by 1800 UTC on October 26.〔

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「Hurricane Rafael」の詳細全文を読む



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