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Hurricane Epsilon
Hurricane Epsilon was the final of fifteen hurricanes within the record-breaking 2005 Atlantic hurricane season. Originating from a cold front beneath an upper-level low, Epsilon formed on November 29 about 915 mi (1470 km) east of Bermuda. Initially, the National Hurricane Center (NHC) forecast the storm to transition into an extratropical cyclone within five days, due to conditions unfavorable for significant intensification. Epsilon continually defied forecasts, at first due to an unexpected loop to the southwest, and later due to retaining its strength despite cold waters and strong wind shear.
On December 1, Epsilon began a northeast motion due to an approaching trough, and the next day it attained hurricane status. After turning to the east, it developed characteristics of an annular hurricane, meaning it had a circular eye, a ring of convection, and had few fluctuations in its intensity. On December 5 Epsilon attained peak winds of 85 mph (140 km/h), and the next day it turned to the south and southwest. Late on December 7, the winds dropped below hurricane status for the first time in five days, making Epsilon the longest-lasting December hurricane on record. Stronger wind shear caused rapid weakening, and the storm could no longer be classified as a tropical cyclone late on December 8. The next day the remnant circulation of Epsilon dissipated.
== Formation and naming ==
On November 27, a surface storm with gale-force winds developed beneath an upper-level low pressure area, about 1150 mi (1850 km) east of Bermuda. At the time, a cold front extended eastward from the surface storm toward the eastern Atlantic Ocean, north of Tropical Storm Delta. By that time, tropical cyclone forecast models anticipated the possible development of a subtropical cyclone, and although they were inconsistent, National Hurricane Center (NHC) specialist Eric Blake stated, "blocking at high latitudes seems to favor another subtropical cyclone effort." The blocking referred to a ridge stretching across the northern Atlantic. The surface storm gradually separated from the frontal zone, but initially its convection, or thunderstorm activity, was sparse and poorly organized.〔
The NHC introduced the system in its tropical weather outlook on November 28, with the possibility of subtropical or tropical development noted. It moved slowly westward, becoming better organized, and by late that day resembled a subtropical cyclone; however, as it was still connected to the cold front, it could not have been classified as such. Early on November 29, an area of deep convection developed and organized over the surface center when it was about 915 mi (1470 km) east of Bermuda. The NHC accordingly assessed the system as developing into a tropical storm, designating it with the Greek letter Epsilon.〔
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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