south west indian_ocean cyclone season south west indian_ocean cyclone season fairly quiet activity began early final named storm formed record late date seven named storms classified france office depressions additional depression classified unofficial warning agency tracked storms september october affected land late november short lived depression formed northeastern portion basin activity remained minimal january tropical storm formed eastern portion basin later month strongest storm season reaching minute maximum sustained winds mph passed near island worst cyclone years killing half population endangered species likely caused cargo ship missing people board storms developed short succession second half february developed rapidly february struck western madagascar killing people local rice trough dissipated spawned tropical storm looped end month tropical storm exited basin adjacent australian region enter south west indian_ocean dissipate long lived originated australian basin late march changed directions extratropical april tropical depression struck eastern madagascar killing people final storm named june latest record seasonal summary season france office island issued warnings tropical cyclones basin agency estimated intensity dvorak technique warned tropical cyclones region coast africa south equator beginning november utilized high resolution picture transmission station conjunction satellite imagery allowed improved dvorak ratings allowing adjusting satellite pictures joint united_states navy united_states_air_force task force issued tropical cyclone warnings southwestern indian_ocean addition named storms tracked tropical depressions named general monsoon weaker normal basin provided flow equator spawn tropical cyclones result marked decrease overall activity compared season issued cyclone season decrease previous year storms formed edge satellite coverage storms severe tropical storm southward moving anticyclone influenced monsoon trough spawn tropical disturbance january located east system moved east organization turning southwest january ridge day classified system tropical cyclone day upgraded depression tropical storm conditions favored strengthening gradually intensified peak minute sustained winds mph january according date assessed peak minute winds mph equivalent minimal hurricane time storm turned south southeast began weaken january days later weakened tropical depression status dissipated tropical cyclone similar originated january surge monsoon trough southwest sumatra days system remained weak moved generally west southwestward january intensified tropical storm status took days intensify tropical cyclone status minute maximum sustained winds mph cyclone attained peak intensity january officially reaching winds mph unofficially estimated winds mph highest agency estimated storm year later turned southeast weakened passing west january storm turned south southwest southeast extratropical february passing near produced strong winds high tides caused flooding capital storm considered worst island years homes damaged destroyed leaving people homeless severely damaged crops roads power grid storm killed half flying fox critically endangered species believed sunk madagascar cargo ship people board days beginning february area convection persisted southeast coast towns february deep convection increased greatly leading tropical disturbance forming utc morning february initiated advisories moving southeastward convection quickly organized center aided warm sea surface temperatures convergence late february system intensified tropical storm passing near island continuing rapidly intensify attained tropical cyclone status february reaching peak winds mph shortly storm landfall western madagascar north rapidly weakened land shifted south later southwest early february emerged tropical disturbance circulation dissipated shortly making landfall western madagascar produced peak winds mph gusts mph city recorded rainfall locations rainfall heavier average annual precipitation villages storm destroyed upwards houses leaving people homeless nationwide cyclone wrecked crops killed livestock tons rice destroyed harvest destroyed irrigation canal flooding acres rice fields flooding washed away heavily damaged roads bridges southwestern madagascar eroded greatly storm killed people heavy rains storm spread causing flooding destroyed houses washed away bridges following storm government appealed international aid response provided usd rebuilding damaged roofs placing temporary bridge bridge washed damaged rice harvest program provided tons rice madagascar cost million usd french government bought tons rice seed distributed affected farmers local governments madagascar provided farmers rice seed ruined crop addition swiss government provided money project discourage slash burn practices severe tropical storm dissipated trough persisted spawning tropical disturbance february halfway madagascar interaction cool air south warm air north fueled deep convection initially moving south system turned southwest february developing eye feature center initiated advisories day tropical cyclone initially maintained system tropical depression upgraded depression tropical storm status february time estimated winds mph day storm approached coast turning east northeast february named system later day estimated peak minute winds mph contrast estimated peak minute winds mph moving northeast passed february storm subsequently executed loop south began weakening february weakened minimal tropical storm status accelerating southeast briefly intensified day march approaching cold absorbed storm near produced gusts mph sustained winds mph severe tropical storm february tropical disturbance formed northeastern portion basin east southeast originated monsoon trough moved generally south southeast quickly intensifying late february upgraded depression time began tracking tropical cyclone february estimated attained peak minute winds mph assessing storm weakening contrast estimated continued slowly intensify minute peak strength mph march shortly storm crossed australian region estimated entered tropical cyclone status steady weakening commenced influence trough cooler waters weakened equivalent tropical depression status march turning west march system south west indian_ocean dissipating shortly tropical cyclone surge monsoon trough spawned cyclone southwest sumatra march identified tropical disturbance australian region crossed south west indian_ocean day march upgraded storm tropical storm tracked system tropical cyclone storm moved southwestward ridge northwest gradually intensified march upgraded equivalent minimal hurricane estimated minute winds mph time break ridge turned south march time estimated peak minute winds mph storm later turned southeast shifted southwest march day upgraded tropical cyclone status estimated peak minute winds mph turned southeast march accelerated weakening tropical storm status upper level wind shear approaching extratropical april tropical depression march area convection spawned small tropical disturbance east eastern coast madagascar classified tropical disturbance system initially moved west northwest poorly organized convection april disturbance turned southeast organized increase convection later day turned west madagascar april disturbance intensified tropical depression reaching peak winds mph utc day system landfall north quickly weakened land dissipating april depression brought heavy rainfall eastern madagascar resulted flooding reported rainfall wind gusts mph floods killed people country moderate tropical storm june near equator trough spawned tropical disturbance east southeast system moved southwest later west influenced trough south initially failed intensify anticyclone provided favorable conditions development warm water temperatures june system passed south day classified tropical cyclone final season system reached area satellite coverage june appeared developed system result agency upgraded depression tropical storm estimating peak minute winds mph june began weakening increased wind shear deteriorating tropical depression status june subsequent days system executed loop maintaining status tropical depression disturbance june passed east moving south accelerated southeast dissipating june storm formed late cyclone season making strongest june storm years latest cyclone year storm properly named tropical depression formed later named cyclone formed july cyclone year ended july end tropical cyclone year shifted july june storms september began monitoring system near system tracked westward organizing classified tropical cyclone september despite predictions strengthen tropical storm system failed intensify winds mph dissipated september similar previous system began monitoring disturbance october initial movement southwest system turned north later west classified system tropical cyclone october estimating peak winds mph days later agency declared system dissipated november tracked system east southeast originated monsoon trough system moved southwest classified november december disturbance intensified tropical depression curved southeast day estimated peak winds mph based distinct appearance satellite imagery day classified system tropical cyclone assessed storm intensifying peak mph intensification aided anticyclone aloft increase wind shear caused marked weakening discontinued advisories december continued tracking system december depression curved southwest final time season effects contemporary seasons atlantic hurricane seasons pacific hurricane seasons pacific typhoon seasons north indian ocean cyclone seasons
1990–91 South-West Indian Ocean cyclone season