1986–87 South-West Indian Ocean cyclone season

ImageSize = width:800 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(0,0.52,0.84) legend:Zone_of_Disturbed_Weather/Tropical_Disturbance_=_≤31_mph_(≤50_km/h) id:TD value:rgb(0.43,0.76,0.92) legend:Tropical_Depression/Subtropical_Depression_=_32–38_mph_(51–62_km/h) id:TS value:rgb(0.30,1,1) legend:Moderate_Tropical_Storm_=_39–54_mph_(63–88_km/h) id:ST value:rgb(0.75,1,0.75) legend:Severe_Tropical_Storm_=_55–73_mph_(89–118_km/h) id:TC value:rgb(1,0.85,0.55) legend:Tropical_Cyclone_=_74–103_mph_(119–166_km/h) id:IT value:rgb(1,0.45,0.54) legend:Intense_Tropical_Cyclone_=_104–133_mph_(167–214_km/h) id:VI value:rgb(0.55,0.46,0.9) legend:Very_Intense_Tropical_Cyclone_=_≥134_mph_(≥215_km/h) 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)" barset:break 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 MFR considered the tropical cyclone year to begin on August 1 and continue to July 31 of the following year. 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 . 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 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 , the storm dissipated on April 26. 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. == Systems ==

Severe Tropical Storm Alinina Toward the middle of January, the Intertropical Convergence Zone (ITCZ) spawned an area of convection between Diego Garcia and St. Brandon. A tropical disturbance formed the next day, characterized by spiral rainbands around a circulation. Severe Tropical Storm Clotilda While Bemezava was still active, another circulation was present between Réunion and Madagascar on February 8. On the next day, a tropical disturbance formed about 150 km (95 mi) east-southeast of Toamasina, Madagascar. A ridge to the south caused the nascent system to move erratic, although generally to the southeast and east. It intensified into Tropical Storm Clotilda on February 10, and on the next day that the JTWC classified it as Tropical Cyclone 17S. However, effects were worst on Réunion, where wind gusts reached and rainfall totaled at Bébourg. The deluge approached the record-setting rains from Cyclone Hyacinthe in 1980 over a 72‑hour period. Clotilda damaged 250 houses, of which 120 were destroyed. About 150,000 people on the island lost access to water, and many roads were damaged. and damage totaled around $2 million (USD). Tropical Cyclone Daodo Several areas of convection persisted within the ITCZ in early March across the open Indian Ocean. One of these organized into a tropical storm on March 2 about 700 km (430 mi) south of Diego Garcia and was given the name Daodo. On the following day, the JTWC began tracking it as Tropical Cyclone 21S. and the JTWC classified it as Tropical Cyclone 24S. Around that time, the storm turned sharply to the south due to a passing trough. Late on April 23, the JTWC upgraded Elizabeta to the equivalent of a minimal hurricane. On the next day, the MFR estimated peak 10 minute winds of , and the JTWC estimated 1 minute winds of . A ridge turned the storm eastward, and Elizabeta gradually weakened, deteriorating to tropical depression status by April 25. Two days later, the system turned to a westward drift due to small ridge, although it turned back to the south the next day due to another ridge. The weak circulation accelerated to the southeast into a polar trough, dissipating on April 29. Although Elizabeta passed just south of the Madagascar, effects were minimal there. However, the storm caused a large fall in barometric pressure at Fort Dauphin, with a drop of over 24 hours. == Season effects ==