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The 1991–92 South-West Indian Ocean cyclone season was an average cyclone season in which most storms remained over open waters. At the time, the season lasted from November 15, 1991 to April 30, 1992, although this season began early when three tropical depressions formed before the official start. The second, designated Tropical Depression A2 by the Météo-France office (MFR) on Réunion, passed north of Madagascar on October 16 before weakening. The first named storm was Severe Tropical Storm Alexandra, which developed on December 18 from the monsoon trough; many other storms during the year originated in this manner. Tropical Storm Bryna was the only tropical storm of the season to make landfall, having struck northeastern Madagascar on January 2. The basin was most active in February, when five named storms developed, including Tropical Depression Elizabetha which struck western Madagascar. In early March, Cyclone Harriet entered the basin from the Australian region and was renamed Heather. It intensified to peak winds of 165 km/h (105 mph), making Heather the strongest storm of the season. In April, another cyclone – Jane – crossed from the Australian region and was renamed Irna, which reentered the Australian region on April 19 to end tropical activity within the basin. ==Season summary== ImageSize = width:1000 height:210 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:01/09/1991 till:01/06/1992 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/10/1991 Colors = id:canvas value:gray(0.88) id:GP value:red id:TD value:rgb(0.38,0.73,1) legend:Tropical_Depression id:TS value:rgb(0,0.98,0.96) legend:Moderate_Tropical_Storm id:ST value:rgb(0.80,1,1) legend:Severe_Tropical_Storm id:TC value:rgb(1,1,0.80) legend:Tropical_Cyclone id:IT value:rgb(1,0.76,0.25) legend:Intense_Tropical_Cyclone id:VI value:rgb(1,0.38,0.38) legend:Very_Intense_Tropical_Cyclone Backgroundcolors = canvas:canvas BarData = barset:Hurricane bar:Month PlotData= barset:Hurricane width:11 align:left fontsize:S shift:(4,-4) anchor:till from:10/09/1991 till:13/09/1991 color:TS text:"01S" from:14/10/1991 till:22/10/1991 color:TD text:"A2 (TD)" from:16/10/1991 till:22/10/1991 color:TD text:"A3 (TD)" from:21/11/1991 till:29/11/1991 color:TS text:"A4 (MTS)" from:18/12/1991 till:29/12/1991 color:ST text:"Alexandra (STS)" from:25/12/1991 till:10/01/1992 color:TS text:"Bryna (MTS)" from:08/02/1992 till:14/02/1992 color:TS text:"Celesta (MTS)" barset:break from:16/02/1992 till:25/02/1992 color:TS text:"Davilia (MTS)" from:22/02/1992 till:26/02/1992 color:TS text:"Elizabetha (MTS)" from:23/02/1992 till:04/03/1992 color:TC text:"Farida (TC)" from:24/02/1992 till:04/03/1992 color:TS text:"Gerda (MTS)" from:26/02/1992 till:01/03/1992 color:TD text:"H1 (TD)" from:01/03/1992 till:07/03/1992 color:VI text:"Harriet-Heather (VITC)" from:14/04/1992 till:19/04/1992 color:TC text:"Jane-Irna (TC)" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/09/1991 till:01/10/1991 text:September from:01/10/1991 till:01/11/1991 text:October from:01/11/1991 till:01/12/1991 text:November from:01/12/1991 till:01/01/1992 text:December from:01/01/1992 till:01/02/1992 text:January from:01/02/1992 till:01/03/1992 text:February from:01/03/1992 till:01/04/1992 text:March from:01/04/1992 till:01/05/1992 text:April from:01/05/1992 till:01/06/1992 text:May TextData = pos:(569,23) text:"(For further details, please see" pos:(713,23) text:"scales)" In general, sea surface temperatures were warmest near the equator in the northeast portion of the basin, and in the Mozambique Channel between Mozambique and Madagascar. During the season, the Météo-France office (MFR) on Réunion island issued warnings in tropical cyclones within the basin. The agency estimated intensity through the Dvorak technique, and warned on tropical cyclones in the region from the coast of Africa to 80° E, south of the equator. The Joint Typhoon Warning Center (JTWC), which is a joint United States Navy – United States Air Force task force, also issued tropical cyclone warnings for the southwestern Indian Ocean. During the season, there was an El Niño event that caused tropical cyclogenesis in the southern hemisphere to shift more to the east. In addition, the monsoon trough, which helped spawn most of the storms in the season, was weaker than normal in the Indian Ocean. The number of tropical depressions forming was above average, although there were fewer days than normal with tropical cyclone activity.〔 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「1991–92 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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