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Hurricane Grace (1991)
Hurricane Grace was a short-lived Category 2 hurricane that contributed to the formation of the powerful 1991 Perfect Storm. Forming on October 26, Grace initially had subtropical origins, meaning it was partially tropical and partially extratropical in nature. It became a tropical cyclone on October 27, and ultimately peaked with winds of . The storm had minor effects on the island of Bermuda as it passed to the south. A developing extratropical storm to the north turned Grace eastward; the hurricane was eventually absorbed into the large circulation of the larger low pressure system. Fed by the contrast between cold air to the northwest and warm air from the remnants of Hurricane Grace, this storm became a large and powerful nor'easter that caused extremely high waves and resulted in severe coastal damage along the U.S. East Coast.
==Meteorological history==
The origins of Grace go back to a mid-level area of low pressure that formed on October 23 to the south of Bermuda. Reports from a nearby ship indicated that the low had become a surface feature by October 25. The storm system initially contained subtropical characteristics, and the center of circulation lacked deep convection for several days. The system was designated a subtropical storm on October 26. An area of clouds near Bermuda became increasingly convective, and gradually became entrained into the expanding and developing circulation of the subtropical storm. Thunderstorm activity persisted near the center, and on October 27, the storm attained tropical storm status and was named Grace.
Grace continued to organize and intensify; based on satellite intensity estimates and reconnaissance reports, the storm was upgraded to a Category 1 hurricane, the lowest level on the Saffir Simpson Hurricane Scale. Grace reached its peak intensity with winds of and a minimum central barometric pressure of 980 mbar (hPa; 28.94 inHg), ranking as a Category 2.〔 Operationally, however, the peak intensity was thought to have been 65 knots (75 mph; 120 km/h), which would have made it a mere Category 1 at its peak strength. The hurricane tracked generally northwestward until October 28, when an extratropical cyclone formed along an approaching cold front off the New England coast. This storm rapidly intensified and influenced Grace's steering currents, turning the hurricane sharply east. At around the same time, an eye feature associated with Hurricane Grace became apparent on satellite imagery, despite a lack of strong convective activity around the storm's center. Grace accelerated as it continued eastward, and reached its peak intensity of Category 2 status on October 29. However, the storm's rapid forward movement led to an asymmetrical circulation. The center passed approximately south of Bermuda without significantly affecting the island.〔
Hurricane Grace turned northeast later that day, as the rapidly approaching cold front undermined the storm's lower-level center. The system became overtaken by the front and subsequently lost its status as a tropical system.〔 It moved north along the front and merged with the large cyclone to the north.〔 The remnants of Grace became completely indistinguishable by the next day as it was completely absorbed by the passing extratropical storm on October 30. The nor'easter significantly strengthened as a result of the temperature contrast between the cold air to the northwest and the warmth and humidity associated with the remnants of Hurricane Grace. The low-pressure system continued deepening as it drifted southeastward and then southwestward towards the United States. The cyclone attained its peak intensity 390 miles (630 km) south of Halifax, Nova Scotia, with winds of up to . The storm became known as the 1991 Perfect Storm, or more commonly, the "Perfect Storm".〔〔
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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