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The 1997–98 South-West Indian Ocean cyclone season was fairly quiet and had the latest start in 30 years. The first tropical disturbance originated on January 16, although the first named storm, Anacelle, was not upgraded until February 8, a record late start. The last storm to dissipate was an unusually late tropical depression in late July. Many of the storms suffered from the effects of wind shear, which contributed to there being only one tropical cyclone – equivalent to a minimal hurricane. The season also occurred during a powerful El Niño. Tropical Depression A1, the first of the season, moved throughout most of Mozambique in January, causing landslides and flooding. One landslide affected Milange District, where many houses were swept into a river. Landslides killed between 87 and 143 people in the country. In February, Cyclone Anacelle buffeted several islands with gusty winds after becoming the strongest storm of the season, reaching maximum sustained winds of 140 km/h (85 mph). Although Anacelle was the first named storm of the season, another tropical depression preceded it that crossed Madagascar several times. The depression eventually became Tropical Storm Beltane, and lasted 17 days. Beltane caused flooding across Madagascar due to heavy rainfall, which killed one person and left locally heavy crop damage. There were several other disturbances in February, including Cindy which dissipated 50 days after it originated, as well as a disturbance that brought heavy rainfall to Réunion and Mauritius. The rest of the season was fairly quiet, mostly with short-lived tropical disturbances or storms. ==Season summary== ImageSize = width:790 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:01/12/1997 till:01/06/1998 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/12/1997 Colors = id:canvas value:gray(0.88) id:GP value:red id:DT value:rgb(0.38,0.73,1) legend:Tropical_Disturbance_<_50_km/h_(_<_31_mph) id:TD value:rgb(0.38,0.73,1) legend:Tropical_Depression_=_51–62_km/h_(32–38_mph) id:MS value:rgb(0,0.98,0.96) legend:Moderate_tropical_Storm_=_63–88_km/h_(39–54_mph) id:SS value:rgb(0.80,1,1) legend:Severe_Tropical_Storm_=_89–117_km/h_(55–73_mph) id:TC value:rgb(1,1,0.80) legend:Tropical_Cyclone_=_118–165_km/h_(74–102_mph) id:IT value:rgb(1,0.76,0.25) legend:Intense_=_166–212_km/h_(103–132_mph) id:VI value:rgb(1,0.38,0.38) legend:Very_Intense_>_212_km/h_(_>_132_mph) Backgroundcolors = canvas:canvas BarData = barset:Hurricane bar:Month PlotData= barset:Hurricane width:10 align:left fontsize:S shift:(4,-4) anchor:till from:02/01/1998 till:03/01/1998 color:TD text:"Selwyn" from:16/01/1998 till:23/01/1998 color:TD text:"A1" from:03/02/1998 till:20/02/1998 color:MS text:"Beltane" from:06/02/1998 till:13/02/1998 color:TC text:"Anacelle" from:16/02/1998 till:19/02/1998 color:TD text:"Victor-Cindy" from:16/02/1998 till:19/02/1998 color:TD text:"D1" barset:break from:24/02/1998 till:24/02/1998 color:DT text:"D2" from:28/02/1998 till:01/03/1998 color:DT text:"D3" from:04/03/1998 till:10/03/1998 color:MS text:"Donaline" from:09/03/1998 till:18/03/1998 color:SS text:"Elsie" from:15/03/1998 till:20/03/1998 color:TD text:"Fiona" from:07/04/1998 till:14/04/1998 color:MS text:"Gemma" barset:break from:22/04/1998 till:22/04/1998 color:TD text:"34S" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/12/1997 till:01/01/1998 text:December from:01/01/1998 till:01/02/1998 text:January from:01/02/1998 till:01/03/1998 text:February from:01/03/1998 till:01/04/1998 text:March from:01/04/1998 till:01/05/1998 text:April from:01/05/1998 till:01/06/1998 text:May During the year, the Météo-France office on Réunion (MFR) issued warnings for tropical systems in the region as the Regional Specialised Meteorological Centre.〔 In the year, MFR tracked tropical cyclones south of the equator from the coast of Africa to 90° E. The Joint Typhoon Warning Center also issued warnings in an unofficial capacity. The season had the latest start in 30 years, with the first depression forming in January.〔 The first storm, Anacelle, was not named until February 8, which retains the record for the latest date of the first named storm. For the early portion of the season, there were unusually quiet conditions across much of the basin, along with higher than normal pressure. The intertropical convergence zone (ITCZ) associated with the monsoon only became active in February, allowing tropical cyclogenesis to occur more frequently. There were six tropical storms during the season, of which only one attained tropical cyclone status; these are below the averages of 9 and 4, respectively. No storms attained intense tropical cyclone status. The season's low activity contrasted that of the previous season, which was much more active. There were 18 days in which a storm was active, the lowest since 1982–83. An ongoing El Niño was evident during the season. 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「1997–98 South-West Indian Ocean cyclone season」の詳細全文を読む スポンサード リンク
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