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Tropical Depression Nineteen (1970)
Tropical Depression Nineteen in 1970 was the wettest known tropical cyclone to affect the United States territory of Puerto Rico.〔 The long-lived depression formed on September 24 just off the west coast of Africa, and for several days maintained a general westward track. It passed through the Lesser Antilles on October 1, and later stalled in the eastern Caribbean Sea. On October 8, the depression crossed over the Dominican Republic, and subsequently it accelerated to the northeast. It was declassified as a tropical cyclone on October 12, although its remnants persisted for another week before dissipating in the westerlies near the Azores.
The depression produced heavy rainfall in the Lesser Antilles, reaching on Barbados; it left three deaths and moderate damage on the island. Another death was reported in the United States Virgin Islands. Torrential rainfall on Puerto Rico inflicted heavy damage, totaling $65 million (1970 USD, $ USD). The highest precipitation total was in Jayuya, of which fell in a 24 hour period. Most of the damage can be attributed to damaged sugar cane and coffee crops. At least 18 people were killed on the island, and the system was considered one of the worst disasters in Puerto Rican history.
==Meteorological history==
The origins of the depression were identified as a tropical wave on September 22 over western Africa. The system exited the west coast of Africa the next day, and on September 24 it developed into a tropical depression about southwest of Conakry, Guinea. The depression moved generally westward, gradually intensifying to attain peak winds of by September 25. A nearby upper-level trough — an elongated area of low pressure — hindered further strengthening, and on October 1 the depression struck the island of Saint Lucia. As it crossed the Lesser Antilles, its winds and barometric pressure approached the values of a tropical storm.〔
In the Caribbean, the trough caused the depression to slow to a westward drift, resulting in several days of heavy rainfall in the region, particularly Puerto Rico.〔 One forecast on October 5 anticipated a continued westward track toward Jamaica. Instead, the depression turned to the north the next day under the influence of the upper-level westerlies.〔 On October 7, the depression attained its lowest pressure of 1000 mbar (29.53 inHg), off the southern coast of Hispaniola.〔 The next day, it made landfall in Peravia Province in the Dominican Republic.〔 After crossing the country and exiting into the Atlantic Ocean, the depression accelerated to the northeast, followed by an eastward turn on October 10 before another turn to the northeast.〔 By October 12, the depression could no longer be classified as a tropical cyclone,〔 although satellite imagery indicated that its remnants continued northeastward. On October 15 the system turned to the west, suppressed by a strong high-pressure area to its north. It re-intensified while crossing through the Azores, attaining a pressure of 994 mbar. It turned to the northwest and was absorbed into the westerlies on October 20.〔
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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