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The 1996–97 South Pacific cyclone season was one of the most active and longest South Pacific tropical cyclone seasons on record, with 12 tropical cyclones occurring within the South Pacific basin between 160°E and 120°W. The season officially ran from November 1, 1996 - April 30, 1998, however, the season ended later than normal with three systems monitored after the official end of the season. The strongest tropical cyclone of the season was Cyclone Gavin which had a minimum pressure of . After the season had ended 4 tropical cyclone names were retired from the naming lists, after the cyclones had caused significant impacts to South Pacific islands. During the season, tropical cyclones were officially monitored by the Regional Specialized Meteorological Center (RSMC) in Nadi, Fiji and the Tropical Cyclone Warning Centers in Brisbane, Australia and Wellington, New Zealand. The United States Armed Forces through the Joint Typhoon Warning Center (JTWC) and Naval Pacific Meteorology and Oceanography Center (NPMOC), also monitored the basin and issued unofficial warnings for American interests. During the season RSMC Nadi issued warnings and assigned names to any tropical cyclones that developed between the Equator and 25°S while TCWC Wellington issued warnings for any that were located to the south of 25°S. The JTWC issued warnings for American interests on any significant tropical cyclone that was located between 160°E and the 180° while the NPMOC issued warnings for tropical cyclones forming between 180° and the American coast. RSMC Nadi and TCWC Wellington measure sustained windspeeds over a 10-minute and used the Australian tropical cyclone intensity scale, while the JTWC and the NPMOC measured sustained windspeeds over a 1-minute period which are compared to the Saffir-Simpson Hurricane Wind Scale (SSHWS). ==Season summary== ImageSize = width:825 height:200 PlotArea = top:10 bottom:80 right:20 left:20 Legend = columns:3 left:30 top:58 columnwidth:270 AlignBars = early DateFormat = dd/mm/yyyy Period = from:01/11/1996 till:01/07/1997 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/11/1996 Colors = id:canvas value:gray(0.88) id:GP value:red id:td value:rgb(0.5,0.8,1) legend:Tropical_Disturbance/Tropical_Depression_(TD) id:c1 value:rgb(0,0.98,0.96) legend:Category_1_=_63–87_km/h_(39–54_mph)_(1) id:c2 value:rgb(0.80,1,1) legend:Category_2_=_88–142_km/h_(55–74_mph)_(2) id:c3 value:rgb(1,1,0.80) legend:Category_3_=_143–158-km/h_(75–98_mph)_(3) id:c4 value:rgb(1,0.56,0.13) legend:Category_4_=_159–204_km/h_(99–127_mph)_(4) id:c5 value:rgb(1,0.38,0.38) legend:Category_5_=_≥205_km/h_(≥128_mph)_(5) Backgroundcolors = canvas:canvas BarData = barset:Hurricane bar:Month PlotData= barset:Hurricane width:10 align:left fontsize:S shift:(4,-4) anchor:till from:23/11/1996 till:26/11/1996 color:C1 text:"Cyril" from:20/12/1996 till:30/12/1996 color:C3 text:"Fergus" from:03/01/1997 till:10/01/1997 color:C4 text:"Drena" from:10/01/1997 till:16/01/1997 color:C3 text:"Evan" barset:break from:26/01/1997 till:02/02/1997 color:C2 text:"Freda" from:17/02/1997 till:18/02/1997 color:TD text:"TD" from:19/02/1997 till:24/02/1997 color:C2 text:"Harold" from:24/02/1997 till:26/02/1997 color:C2 text:"29P" barset:break from:03/03/1997 till:12/03/1997 color:C4 text:"Gavin" from:13/03/1997 till:18/03/1997 color:C3 text:"Hina" from:17/04/1997 till:19/04/1997 color:C1 text:"Ian" from:02/05/1997 till:05/05/1997 color:C2 text:"June" barset:break from:26/05/1997 till:28/05/1997 color:C1 text:"37P" from:07/06/1997 till:17/06/1997 color:C3 text:"Keli" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/11/1996 till:30/11/1996 text:November from:01/12/1996 till:31/12/1996 text:December from:01/01/1997 till:31/01/1997 text:January from:01/02/1997 till:28/02/1997 text:February from:01/03/1997 till:31/03/1997 text:March from:01/04/1997 till:30/04/1997 text:April from:01/05/1997 till:31/05/1997 text:May from:01/06/1997 till:30/06/1997 text:June TextData = pos:(569,23) text:"(For further details, please see" pos:(713,23) text:"scales)" Ahead of the cyclone season starting on November 1, 1996, the weak to moderate La Nina episode that had caused tropical cyclone activity, to be generally confined to the Coral Sea during the previous season persisted. However, during the season the La Nina episode started to break down, with signs emerging that the El Nino Episode of 1997-98 was starting to develop.〔〔 These signs included tropical cyclones occurring to the east of 165°E and the South Pacific Convergence Zone becoming more active.〔 The season officially featured a total of eleven tropical cyclones occurring in RSMC Nadi's area of responsibility to the north of 25S, while one developed in TCWC Wellington's area of responsibility and could not be named.〔 〕 An additional system was monitored by the United States Joint Typhoon Warning Center, which was an unofficial warning centre for the region, along with the Naval Pacific Meteorology and Oceanography Center during the season. Significant tropical cyclones during the season included Fergus and Drena, which both impacted the island nations of Vanuatu, New Caledonia and New Zealand. Severe Tropical Cyclone Gavin was the strongest tropical cyclone and impacted the island nations of Tuvalu, Fiji, New Zealand, Wallis and Futuna. Severe Tropical Cyclone Hina subsequently became the worst tropical cyclone to affect the South Pacific island nation of Tonga since Cyclone Isaac in 1982. Three tropical cyclones developed after the season ended on April 30, including Severe Tropical Cyclone Keli which became the first recorded post-season tropical cyclone to form during June 1997. The names Drena, Fergus, Gavin, Hina and Keli were subsequently retired, by the World Meteorological Organization's RA V Tropical Cyclone Committee. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1996–97 South Pacific cyclone season」の詳細全文を読む スポンサード リンク
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