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Cyclone Osea
Cyclone Osea was the second of seven cyclones to affect French Polynesia during the 1997–98 South Pacific cyclone season. Forming on November 22, the storm initially remained weak. Moving south and later east, it was named Osea on November 24 after achieving windspeeds equal to a Category 1 cyclone on the Australian tropical cyclone intensity scale. Continuing to intensify, Osea soon reached its peak intensity of . Afterwords, Osea began to weaken because of increased wind shear, and the cyclone started moving southeast. By November 28, Osea was no longer a tropical cyclone.
The cyclone brought major damage to some islands in French Polynesia. Around 95% of the infrastructure in Maupiti was destroyed, including 77 homes, an airport, and a town hall. About 30% of the infrastructure in Bora-Bora was destroyed, as well as 309 homes and many yachts. Many roads were also damaged. Almost everything on the north side of the island was destroyed. However, no deaths were reported. The name Osea was retired after this usage of the name.
==Meteorological history==
On November 22, 1997, the Fiji Meteorological Service's Regional Specialized Meteorological Center in Nadi, Fiji (RSMC Nadi) and the Naval Pacific Meteorology and Oceanography Center (NPMOC) started to monitor a tropical depression that had developed about to the northeast of the Northern Cook Island: Manihiki. Over the next two days the depression gradually developed further, as it slowly moved southwards due to a weakness in the subtropical ridge of high pressure.〔 At 1200 UTC on November 23, the NPMOC reported that the depression had become equivalent to a tropical storm and assigned it the designation 06P. Twelve hours later RSMC Nadi named the system Osea after it had developed into a Category 1 tropical cyclone on the Australian tropical cyclone intensity scale.〔 Thereafter, Osea started moving towards the southeast, as an area of high pressure started to develop to the south of the system.〔
During November 25, RSMC Nadi estimated that Osea had become a Category 3 severe tropical cyclone, while the NPMOC announced that the system had become equivalent to a Category 1 hurricane on the Saffir-Simpson hurricane wind scale as it moved through French Polynesia. The next day both agency's reported that Severe Tropical Cyclone Osea had reached its peak intensity.〔 RSMC Nadi reported 10-minute sustained winds of 150 km/h (90 mph); the NPMOC reported peak 1-minute sustained windspeeds of 165 km/h (105 mph) which made it equivalent to a Category 2 hurricane on the SSHS.〔 After attaining peak intensity, Osea gradually weakened. By November 27, the NPMOC had issued their final warning on the system because the convection had become dislocated over from the low level circulation center due to increased wind shear. RSMC Nadi subsequently monitored Osea for another 24 hours before it was last noted by the agency on November 28, around the time it degenerated into a tropical depression.〔〔
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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