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Cyclone Tusi
Severe Tropical Cyclone Tusi was a tropical cyclone which affected the island nations of Tuvalu, Tokelau, Western Samoa, American Samoa, Niue and the Southern Cook Islands during January 1987. The precursor tropical depression to Cyclone Tusi developed on January 13, within a trough of low pressure near the island nation of Tuvalu. Over the next few days the system gradually developed further before it was named Tusi during January 16, after it had become equivalent to a modern-day category 1 tropical cyclone on the Australian tropical cyclone intensity scale. After being named the system gradually intensified as it moved southeastwards along the trough, between the islands of Fakaofo and Swains during January 17. Tusi's eye subsequently passed near or over American Samoa's Manu'a Islands early the next day, as the system peaked in intensity with 10-minute sustained wind speeds of 150 km/h (90 mph). The system subsequently posed a threat to the Southern Cook Islands, however this threat gradually diminished as Tusi moved southwards and approached 25S during January 20.
==Meteorological history==
On January 13, 1987, the Fiji Meteorological Service's Nadi Tropical Cyclone Warning Center, started to monitor a small tropical depression that had developed within a trough of low pressure near the island nation of Tuvalu. Over the next few days the system gradually developed further, as it moved south-eastwards towards Tokelau.〔 TCWC Nadi subsequently named the system Tusi early on January 16, after reports of storm-force winds up to 95 km/h (60 mph) had been received from Tokelau and the system had developed into a modern-day category one tropical cyclone on the Australian tropical cyclone intensity scale.〔 Later that day the Naval Western Oceanography Center (NWOC) initiated advisories on the system and designated it as Tropical Cyclone 08P. After being named the system gradually intensified as it moved southeastwards along the trough, between Tokelau's Fakaofo and Swains islands and passed about to the east of Swains island during January 17.〔 During that day Tusi started to move southwards as it intensified further and developed an eye, before TCWC Nadi reported that the system had become a category 3 severe tropical cyclone with hurricane force winds.〔〔
Tusi's eye subsequently passed near or over American Samoa's Manu'a Islands early the next day, as the system peaked in intensity with TCWC Nadi estimating 10-minute sustained wind speeds of 150 km/h (90 mph).〔〔 Later that day the NWOC estimated that Tusi had peaked with 1-minute sustained wind speeds of 185 km/h (115 mph), which made it equivalent to a category 3 hurricane on the Saffir-Simpson hurricane wind scale.〔〔 By this time the system had started moving towards the south-southeast and posed a threat to the Southern Cook Islands.〔 During January 18, the system started to weaken as its outflow became unidirectional, before it started to move southwards again during January 20.〔 As a result, the threat to the Southern Cook Islands gradually diminished and no gale force winds were observed in the Cook Islands.〔 The system subsequently moved below 25S and transitioned into an extra-tropical depression during the next day.〔〔 An area of high pressure to the southeast of the system subsequently steered Tusi's remnants westwards, before they were last noted to the northeast of New Zealand on January 25.〔〔
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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