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The 1986–87 South-West Indian Ocean cyclone season was below average due to an ongoing El Niño and a weak monsoon that suppressed convection and storms. There were only five named storms tracked by the Météo-France office (MFR) on Réunion. The United States-based Joint Typhoon Warning Center (JTWC) followed four other storms in the basin, which is the waters of the Indian Ocean south of the equator and west of 90° E to the coast of Africa. The JTWC tracked a storm on August 1 in the northeastern portion of the basin, unusual for the time of year. The first named storm was Severe Tropical Storm Alinina, which originated from the intertropical convergence zone east of Madagascar in the middle of January. However, there was an unnamed tropical depression that produced heavy rainfall in Réunion and Madagascar, causing two deaths in the latter country. In February, two tropical storms were active near the Mascarene Islands. Tropical Storm Bemezava was a weak storm that took an erratic track around the island of Rodrigues. Tropical Storm Clotilda, the most damaging of the season, stalled near Réunion for three days, producing of rainfall at Bébourg. The rainfall totals approached the world record precipitation totals set by Cyclone Hyacinthe in 1980. The rains killed 10 people, destroyed 120 houses, and caused $2 million (1987 USD) in damage. Later, Daodo in March was the strongest storm of the season and the only to attain tropical cyclone status, reaching of 135 km/h (85 mph). Elizabeta was the final storm of the season tracked by the MFR, forming south of Madagascar in April and dissipating on April 29. ==Seasonal summary== ImageSize = width:1000 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:01/08/1986 till:01/07/1987 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/08/1986 Colors = id:canvas value:gray(0.88) id:GP value:red id:ZD value:rgb(0.5,0.8,1) legend:Zone_of_Disturbed_Weather/Tropical_Disturbance id:TD value:rgb(0.38,0.73,1) legend:Tropical_Depression/Subtropical_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:01/08/1986 till:03/08/1986 color:TS text:"01S (MTS)" from:01/01/1987 till:06/01/1987 color:TD text:"Unnamed (TD)" from:07/01/1987 till:12/01/1987 color:TS text:"06S (MTS)" from:16/01/1987 till:24/01/1987 color:ST text:"Alinina (STS)" from:05/02/1987 till:17/02/1987 color:TS text:"Bemazava (MTS)" from:09/02/1987 till:22/02/1987 color:ST text:"Clotilda (STS)" from:02/03/1987 till:18/03/1987 color:TC text:"Daodo (TC)" from:20/04/1987 till:29/04/1987 color:ST text:"Elizabeta (STS)" from:24/04/1987 till:26/04/1987 color:TS text:"26S (MTS)" from:25/06/1987 till:27/06/1987 color:TD text:"28S" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/08/1986 till:01/09/1986 text:August from:01/09/1986 till:01/10/1986 text:September from:01/10/1986 till:01/11/1986 text:October from:01/11/1986 till:01/12/1986 text:November from:01/12/1986 till:01/01/1987 text:December from:01/01/1987 till:01/02/1987 text:January from:01/02/1987 till:01/03/1987 text:February from:01/03/1987 till:01/04/1987 text:March from:01/04/1987 till:01/05/1987 text:April from:01/05/1987 till:01/06/1987 text:May from:01/06/1987 till:01/07/1987 text:June TextData = pos:(569,23) text:"(For further details, please see" pos:(713,23) text:"scales)" During the season, the Météo-France office (MFR) on Réunion island issued warnings in tropical cyclones within the basin. Using satellite imagery from National Oceanic and Atmospheric Administration, the agency estimated intensity through the Dvorak technique, and warned on tropical cyclones in the region from the coast of Africa to 90° E, south of the equator. The World Meteorological Organization would later label the MFR as a Regional Specialized Meteorological Center in 1993. 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.〔 The season's five named storms and one tropical cyclone – a storm attaining maximum sustained winds of at least - were both below the average of nine and five, respectively. The MFR considered the tropical cyclone year to begin on August 1 and continue to July 31 of the following year.〔 There was an ongoing El Niño by December, and by January, the monsoon was weaker than normal across the region. This caused below normal thunderstorm activity in February. In addition to the storms classified by the MFR, the JTWC tracked four additional storms. The first, classified as Tropical Cyclone 01S, formed on August 1 in the northeastern portion of the basin, an infrequent event for the time of year. The storm moved westward with peak 1 minute winds of 85 km/h (50 mph). It gradually weakened, dissipating on August 3 near Diego Garcia. The JTWC also tracked a short-lived storm in January that they classified as Tropical Cyclone 06S. The storm formed on January 7 in the eastern portion of the basin near Diego Garcia, and reached winds of 85 km/h (50 mph) while moving southeastward. After stalling on January 9, the system dissipated three days later.〔 Later, the agency monitored Tropical Cyclone 26S beginning on April 24. The storm formed south of Diego Garcia and moved in a counterclockwise direction, first to the southeast and later to the north. After reaching peak 1 minute winds of 85 km/h (50 mph), the storm dissipated on April 26.〔 The final storm tracked by the agency originated on June 25 in the far northeastern portion of the basin between Diego Garcia and the Cocos Islands. It moved slowly to the southwest, failing to intensify beyond winds of 65 km/h (40 mph). Turning to the southeast, the system dissipated on June 27.〔 The MFR did not track any tropical depressions before January, making Alinina in January the first official storm of the season. However, there was an earlier tropical depression that originated as a low pressure area on January 1 near Tromelin Island. It was a large system that spread rainfall between Madagascar and the Mascarene Islands for several days. By January 2, the depression consisted of a circulation with spiral rainbands about 150 km (95 mi) west of Tromelin. The system moved southward without intensifying much, and it passed about 130 km (80 mi) west of Réunion on January 4. While near the island, the depression dropped heavy rainfall that broke 24 hour totals at 10 locations, peaking at at Dos d'Âne. The system intensified slightly afterward, although it turned to the east due to a ridge to the south and was no longer tracked after January 6. In Madagascar, the heavy rainfall led to flooding around the capital Antananarivo, displacing 40,220 people. The floodwaters covered rice fields and entered houses, killing two people. Local Red Cross offices provided shelter and food to victims. 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「1986–87 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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