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Tropical Depression 18W (2013)
Tropical Depression 18W was a tropical depression/minimal tropical storm that impacted Vietnam, Laos, Cambodia and Thailand during mid September 2013. The system was first noted as a tropical depression on September 16, 2013, while it was located within the South China Sea to the south east of Hanoi in Vietnam. Over the next two days the system gradually developed further, before it was reported by the Vietnamese National Centre for Hydro Meteorological Forecasting that the system had developed into their eighth tropical storm of 2013. However, other meteorological agencies did not report that the system had developed into a tropical storm.
In Vietnam, flooding triggered by the storm killed at least seven people and 5,000 homes were damaged or destroyed. Severe flooding took place in neighboring Laos where at least 10,000 structures were damaged and losses reached $61 million (United States dollars).
==Meteorological history==
On September 16, the Japan Meteorological Agency (JMA) and the Vietnamese National Centre for Hydro Meteorological Forecasting (VNCHMF) reported that a tropical depression had developed within an area of low to moderate vertical windshear, about to the southeast of Hà Nội, Vietnam. Over the next two days the depression gradually developed further as it moved westwards, before the VNCHMF reported during September 17, that the system had developed into their eighth tropical storm of the season. Later that day as vertical windshear over the system decreased slightly, the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert. During the next day after the depressions low level circulation center had started to consolidate, the JTWC initiated advisories and designated the system as Tropical Depression ''18W''. During that day the system moved westwards along the southern edge of the subtropical ridge of high pressure, before the JTWC issued its final warning on the system later that day after the depression had made landfall on Vietnam, near the port city of Da Nang.〔〔 Over the next couple of days the system continued to move westwards and moved through Vietnam, Laos and Thailand, before it was last noted on September 21 over the Thai province of Phetchabun.
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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