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The 1998–99 South Pacific cyclone season was a near average South Pacific tropical cyclone season, with 8 tropical cyclones occurring within the South Pacific Ocean basin between 160°E and 120°W. Despite the season starting on November 1, the first tropical system of the season did not form until December 1, while the final disturbance of the season dissipated on May 27, 1999. During the season the most intense tropical cyclone was Severe Tropical Cyclone Cora, which had a minimum pressure of . After the season had ended the names Cora and Dani were retired from the naming lists, after they 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 Center in Wellington, New Zealand. While the United States Navy also monitored the basin and issued unofficial warnings throughout the season, through its Joint Typhoon Warning Center (JTWC) and Naval Pacific Meteorology and Oceanography Center (NPMOC). Tropical cyclones that were located between 160°E and 120°W as well as the Equator and 25°S were monitored by TCWC Nadi while any that were located to the south of 25°S between 160°E and 120°W were monitored by TCWC Wellington. During the season the JTWC issued warnings on any 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 both used the Australian tropical cyclone intensity scale, and measured windspeeds over a 10-minute period, while the JTWC and the NPMOC measured sustained windspeeds over a 1-minute period. For the first time this season, RSMC Nadi assigned a number and the letter F to each significant tropical disturbance that moved within the South Pacific basin, while the JTWC and NPMOC continued to assign a number and the letter P to significant tropical cyclones throughout the Southern Hemisphere. ==Seasonal summary== ImageSize = width:820 height:220 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:01/11/1998 till:01/06/1999 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/11/1998 Colors = id:canvas value:gray(0.88) id:GP value:red id:DI value:rgb(0.5,0.8,1) legend:Tropical_Disturbance id:TD value:rgb(0.38,0.73,1) legend:Tropical_Depression id:C1 value:rgb(0,0.98,0.96) legend:Category_1_=_63-87_km/h_(39-54_mph) id:C2 value:rgb(0.80,1,1) legend:Category_2_=_88-142_km/h_(55-74_mph) id:C3 value:rgb(1,1,0.80) legend:Category_3_=_143-158_km/h_(75-98_mph) id:C4 value:rgb(1,0.76,0.25) legend:Category_4_=_159-204_km/h_(99-127_mph) id:C5 value:rgb(1,0.38,0.38) legend:Category_5_=_≥205_km/h_(≥128_mph) Backgroundcolors = canvas:canvas BarData = barset:Hurricane bar:Month PlotData= barset:Hurricane width:11 align:left fontsize:S shift:(4,-4) anchor:till from:04/12/1998 till:05/12/1998 color:DI text:"01F" from:14/12/1998 till:17/12/1998 color:TD text:"07P" from:21/12/1998 till:24/12/1998 color:TD text:"02F/08P" from:23/12/1998 till:28/12/1998 color:C3 text:"Cora" from:25/12/1998 till:26/12/1998 color:DI text:"04F" from:01/01/1999 till:05/01/1999 color:TD text:"05F" barset:break from:03/01/1999 till:05/01/1999 color:DI text:"06F" from:15/01/1999 till:22/01/1999 color:C4 text:"Dani" from:22/01/1999 till:23/01/1999 color:C2 text:"Olinda" from:23/01/1999 till:26/01/1999 color:C2 text:"Pete" from:09/02/1999 till:13/02/1999 color:C1 text:"Ella" from:16/02/1999 till:21/02/1999 color:C3 text:"Frank" barset:break from:17/02/1999 till:19/02/1999 color:TD text:"17F" from:25/02/1999 till:28/02/1999 color:C1 text:"Gita" from:11/03/1999 till:18/03/1999 color:C3 text:"Hali" from:13/03/1999 till:18/03/1999 color:TD text:"20F" from:28/03/1999 till:28/03/1999 color:DI text:"21F" from:09/04/1999 till:09/04/1999 color:DI text:"22F" barset:break from:21/04/1999 till:21/04/1999 color:DI text:"23F" from:20/05/1999 till:26/05/1999 color:DI text:"26F" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/11/1998 till:01/12/1998 text:November from:01/12/1998 till:01/01/1999 text:December from:01/01/1999 till:01/02/1999 text:January from:01/02/1999 till:01/03/1999 text:February from:01/03/1999 till:01/04/1999 text:March from:01/04/1999 till:01/05/1999 text:April from:01/05/1999 till:01/06/1999 text:May TextData = pos:(569,23) text:"(For further details, please see" pos:(713,23) text:"scales)" In direct contrast to the previous season when an El Niño episode was observed, 1998-99 was characterised by a La Nina episode, which contributed to the slump in activity that was observed during the season. In total 27 Tropical Disturbances and Tropical Depressions developed, of which 8 developed further into tropical cyclones and severe tropical cyclones.〔 The shift from El Nino to a La Nina also helped shift the mean genesis area into the Coral Sea area from just east of the Northern Cook Islands, with 5 of the 8 cyclones during the season developing in that area.〔〔 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「1998–99 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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