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Tropical Storm Etau (2015)
Severe Tropical Storm Etau caused extensive and destructive floods across eastern Japan during early September 2015. Originating from a tropical disturbance near Guam on September 2, Etau was first classified a tropical depression on September 5. Tracking generally north, the cyclone gradually intensified and reached its peak strength with winds of 95 km/h (60 mph) on September 8. The following day, Etau made landfall in Honshu, Japan. It subsequently transitioned into an extratropical cyclone later that day over the Sea of Japan.
Record-breaking rains fell across Ibaraki and Tochigi prefectures, triggering destructive floods. Evacuation orders were issued to approximately 2.8 million people. Levee breaches took place along multiple rivers, most notably the Kinugawa which subsequently inundated the city of Jōsō. Eight people were killed across eastern Japan and agricultural, forestry, and fishery damage amounted to ¥11.7 billion (US$97.8 million).
==Meteorological history==
On September 2, a tropical disturbance developed to the northwest of the island of Guam. The system moved in a northwesterly track until it organised with deep convection,〔()〕 therefore, it was then classified as a weak tropical depression by the JMA on September 5.〔(【引用サイトリンク】url=http://www.webcitation.org/6bKAn0c6z )〕 The next day, the JTWC issued a TCFA on the system as in the same time the JMA started issuing advisories on it.〔()〕〔(【引用サイトリンク】url=http://www.webcitation.org/6bLnjfDTf )〕 Later in the same day, the JMA upgraded the depression to a tropical storm, receiving the name ''Etau'' whilst the JTWC designated it as ''18W''.〔(【引用サイトリンク】url=http://www.webcitation.org/6bLniaE0sf )〕〔(【引用サイトリンク】url=http://www.webcitation.org/6bLo50v8Q )〕 Formative bands wrapped around its ragged and ill-defined LLCC.〔(【引用サイトリンク】url=http://www.webcitation.org/6bLoA6eoq )〕 Satellite image revealed that Etau had convection increasing near its center,〔(【引用サイトリンク】url=http://www.webcitation.org/6bN1izhRK )〕 therefore, the JTWC upgraded it to a tropical storm. The system later reached its peak intensity as a severe tropical storm on September 8 with maximum sustained winds of 95 km/h (60 mph). Some weakening took place before the system made landfall over Chita Peninsula, Aichi, in the Chūbu region of Japan, early on September 9. Transition into an extratropical cyclone ensued as Etau became embedded within a frontal boundary. This process completed later that day as Etau emerged over the Sea of Japan.
The extratropical remnants of Etau later interacted with and was absorbed by another but larger extratropical system which were the remnants of Typhoon Kilo on September 13.
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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