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Hurricane Lili (1984)
Hurricane Lili was one of only five Atlantic tropical cyclones on record to reach hurricane status in the month of December. The final of thirteen tropical storms in the 1984 Atlantic hurricane season, Lili developed as a subtropical cyclone which originated from a frontal trough to the south of Bermuda on December 12. It tracked southeastward, then northward, slowly attaining tropical characteristics and becoming a hurricane on December 20. Lili turned to the south and southwest, briefly threatening the northern Caribbean islands before weakening and dissipating near the coast of the Dominican Republic. The storm produced light rainfall but no damage.
==Meteorological history==
In the second week of December, a frontal trough stalled south of Bermuda. An upper level disturbance moved over the area on December 9, and produced widespread convection along the frontal wave. The system moved to the northeast, and based on a developing circulation within the convection, the National Hurricane Center classified the system as a subtropical storm on December 12 while located 275 miles (440 km) northeast of Bermuda.
With winds of 60 mph (95 km/h) and strengthening, the subtropical storm initially drifted northeastward. On December 13, a ridge of high pressure to its north forced the storm southeastward, and the following day the storm turned to the south after an upper-level cold-core low developed over the system. A break in the ridge resulted in the storm turning to the northeast, with its forward motion accelerating to nearly 40 mph (65 km/h). After turning to the northwest on December 17, the high pressure system again halted its northward movement, leaving the storm drifting south-southeastward. Conditions favored further strengthening, and the subtropical storm reached 70 mph (115 km/h) winds on December 18. Satellite imagery estimated the storm attained hurricane status on December 19, and a day later ship near the center reported winds of 75 mph (120 km/h). Based on the wind report, as well as a minimum central pressure of 980 mbar and a well-defined eye, the storm was classified as Hurricane Lili while located 730 miles (1,180 km) east of Bermuda.〔
Lili continued generally southward, reaching its peak intensity of 80 mph (130 km/h). Higher pressures developed to its northeast, resulting in the hurricane to accelerate to the southwest. On December 22, Lili finished executing its large cyclonic loop by passing over the same location it passed one week prior. The combination of its increased forward speed, as well as increased levels of vertical wind shear, created an unfavorable environment which caused steady weakening. On December 23, Lili weakened to a tropical storm while located 430 miles (690 km) northeast of Antigua. It rapidly lost organization as it approached the Leeward Islands, and dissipated just off the coast of the Dominican Republic on December 24.〔
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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