south west indian_ocean cyclone season south west indian_ocean cyclone season longest record unusually early start unusually late ending activity november february according france office tropical disturbances intensified tropical depressions named storms beginning proceeding addition warned storms region identified tropical storms storms attained tropical cyclone status minute maximum sustained winds mph strengthened intense tropical cyclones tied strongest storm season august tropical depression developed south west indian_ocean time years month later rare september tropical disturbance formed named storm originate neighboring australian basin east subsequent named storms formed australian region early december likely developed remnants previous tropical storm reaching peak minute winds mph weakened passed southwest mauritius storm left heavy crop damage indirectly caused deaths early january tropical storm succession storms madagascar cyclone killed people struck southeastern madagascar january february lasted days australian south west indian basins february tropical storm killed people western madagascar causing severe flooding final named storm tropical storm dissipated march striking killing people despite early end named storms additional disturbances july tropical depression years season summary season france office based island issued warnings tropical cyclones basin role agency estimated dvorak technique uses images satellites certain days satellites limited coverage eastern portion region limited warning capability time issued warnings tropical cyclones indian_ocean coast africa south equator joint united_states navy united_states_air_force task force issued tropical cyclone warnings region wind estimates basins world sustained minutes estimates united_states based sustained minute minute winds times minute winds named storms list provided nation beginning addition named storms year list included season active normal fourth consecutive normal season total days disturbances depressions storms cyclones active compared average named storms normal intensified tropical cyclones normal season longest record depression august final depression july despite long season minimal activity march usually represents total activity addition february relatively quiet despite peak majority storms developed northeast portion basin storms took variety tracks storms severe tropical storm middle october convergence zone active northeast portion basin adjacent australian region spawning low pressure area october northwest large ridge south system tracked southwestward crossing south west indian_ocean tropical depression october day began issuing warnings system tropical cyclone october depression intensified tropical storm developing defined central dense overcast began turning west southwest day strengthened peak intensity tropical cyclone status minute winds mph time storm developed eye feature quickly dissipated began weakening steadily october increasing wind shear time moving quickly westward circulation largely devoid deep convection storm weakened tropical depression october day passed north northern tip madagascar dissipated october intense tropical cyclone late october developed persistent area convection west indonesian island sumatra tropical low formed october australian region initially failed develop persistent wind shear named system october north newly upgraded storm tracked generally westward ridge south entered south west indian_ocean november strong tropical storm time renamed moved farther away storm turned southwest began quickly intensifying early november attained tropical cyclone status day reached peak minute winds mph intense tropical cyclone reaching peak winds slowed motion november moving high pressure areas weakened slightly ridge built cyclone resumed steady west southwest track minute winds decreased mph november day began eye increasingly defined diameter november storm attained intense tropical cyclone status previous peak intensity according rare occurrence early november storm intense tropical cyclone occasions estimated peak minute winds mph strong approaching trough turned southeast november incurred rapid weakening wind shear trough passed cyclone turned southwest november weakening tropical depression days later circulation dissipated having affected land severe tropical storm similar previous storms tropical storm originated australian region november began tracking system tropical disturbance west coast sumatra system fluctuated intensity moving westward entering south west indian tropical depression november time begun classifying tropical cyclone november depression intensified tropical storm convection continued organize despite presence wind shear day estimated peak minute winds mph november estimated peak minute winds mph approaching trough significant weakening weakened tropical depression status hours peak intensity ridge trough steered weakening system northwest causing reach low latitude difficult continue tracking circulation agency issued final advisory november northwest continued tracking storm days remnants likely contributed formation subsequent intense tropical cyclone previous tropical storm lost circulation near november convection persisted moved southwest large ridge new tropical disturbance developed december wind shear diminished remnants took longer hours policy time treat disturbance new system december depression intensified tropical storm eye began form day indicative strengthening upgraded tropical cyclone status december utc day estimated peak winds agency estimated minute winds mph making intense tropical cyclone estimated minute winds mph time cyclone turned south approaching trough eye previously defined diameter peak gradually organized decreasing water temperatures turned southeast december bringing islands mauritius weakening strong tropical storm sharp increase wind shear removed convection circulation december weakening tropical depression status days later circulation dissipated late duration passed mauritius producing wind gusts mph rainfall recorded storm surge passage half island lost power lost water service left heavy crop damage heavy rainfall flights canceled storm passage indirect deaths mauritius including road accident threatening directly strike cyclone passed northeast island result winds strong mauritius moderate tropical storm early december spawned area convection near boundary south west indian australian regions december estimated disturbance formed australian region entered basin december convection developed central dense overcast system intensified tropical storm december later day estimated peak minute winds mph december estimated peak minute winds mph time moving steadily west southwestward storm slowed december polar trough caused storm accelerate southwest december simultaneously increasing wind shear causing weakening december dissipated south severe tropical storm end december produced widespread area convection northeast madagascar circulation developed january tropical disturbance convection organized system intensified january moving southwestward storm strengthened somewhat reaching minute winds mph making landfall eastern madagascar time estimated peak minute winds winds mph quickly weakened tropical depression land emerged january proximity land system failed intensify initially despite warm waters january turning south western madagascar attained tropical storm status day estimated peak minute winds mph turning southeast struck southwestern madagascar near late january storm quickly weakened land emerging indian_ocean january tropical disturbance turning south dissipated january absorbed nearby trough spread rainfall madagascar proved beneficial crops tropical cyclone spawned tropical disturbance january west day intensified tropical storm large ridge southeast storm moved southwestward gradually intensified tropical cyclone january time storm passed northwest early january estimated peak minute winds mph estimated minute winds mph day near peak intensity landfall southeastern madagascar near cyclone hit region years rapidly weakened tropical depression land gradually intensified moderate tropical storm trough turned storm southeast january days later storm dissipated south southwest madagascar dropped nearly rainfall mountainous center island cyclone produced wind gusts mph madagascar heavy rainfall washed away local meteorological station flooding reported areas washed away boats forced residents hold trees survive houses damaged destroyed leaving people homeless estimated destroyed tons rice tons tons cash crops coffee overall people killed left missing madagascar confirmed fatalities weeks storm damage estimated million usd later storm caused power outages knocked trees southeastern intense tropical cyclone long lived formed january australian region monsoon trough north days system directions maintaining southwest trajectory january time system intensified reaching minute winds mph weakening occurred january cyclone entered south west indian_ocean time renamed time storm located ridges causing motion nearly stationary january entered australian region time storm began undergoing large loop east winds decreased tropical storm status influence monsoon trough turned storm south january day later building ridge turned storm west january crossed south west indian_ocean intensifying tropical storm warm waters favorable upper level conditions attained cyclone status february estimated peak minute winds mph time estimated peak minute winds mph slightly estimate cyclone peak winds australian region powerful ridge near turned southeast february cooler water temperatures induced weakening days later strong wind shear contributed weakening storm deteriorated tropical depression status turning west circulation declared dissipated february continued tracking february system northeast coast madagascar severe tropical storm january spawned area convection southwest west east system quickly developed organized central dense overcast failed tropical cyclone lack circulation region late january system developed tropical depression time named depression quickly intensified tropical storm development halted january nearby trough storm tracked southeast resumed intensification january quickly reaching peak winds mph estimated peak minute winds mph subsequently increased wind shear weakened hours storm decreased peak intensity tropical depression status trough passed storm turned north influence ridge south dissipating january east southeast initially formed tropical cyclone late january early february produced areas convection northern tip madagascar convective system spawned low pressure area island initially located february system developed tropical depression failed intensify executing clockwise loop northeastern madagascar convection increased depression intensified tropical storm february named subsequently storm moved northern madagascar emerged february tropical depression structure deteriorated turned southwest western madagascar despite warm waters initially failed intensify february attained tropical storm status subsequently turned south broad area low pressure region storm quickly intensified moving far away madagascar tropical cyclone february soon reaching peak winds mph contrast estimated peak minute winds mph near peak intensity eyewall passed approaching cold turned cyclone southeast bringing storm cooler waters causing weakening increased wind shear february extratropical south madagascar dissipated day northwestern madagascar dropped heavy rainfall caused widespread flooding towns isolated forcing residents travel boat storm heavily damaged crops region particularly rains caused rivers exceed banks resulting flooding deep nationwide people killed initial reports people missing produced maximum sustained winds mph gusts mph blowing away severe tropical storm area convection formed northeast portion basin developing tropical disturbance february despite presence easterly wind shear system slowly organized tropical storm february time storm large disorganized area convection quickly weakened increase wind shear early february weakened tropical depression status later day attained tropical storm status shear diminished storm moving generally west southwest large ridge southeast storm short lived weakened tropical depression status february intensify tropical storm time hours later convection storm developed eye feature indicative late february passed south wind gusts remained mph island storm dropped beneficial rainfall totaling subsequently attained peak minute winds mph february estimated minute winds passing southeast mauritius storm curved south approaching trough dissipating february severe tropical storm end february spawned system coast circulation warm water temperatures system developed tropical disturbance february offshore northeastern system slowly organized drifting southward ridges increase convection system intensified tropical storm february according time upgraded storm equivalent tropical cyclone status building ridge turned storm sharply westward march estimated peak minute winds mph making severe tropical storm eye feature center comparison estimated peak minute winds mph storm failed intensify making landfall peak intensity north early march turned west northwest dissipating march dropped heavy rainfall region traversed causing severe flooding central northern south central rainfall totals ranging setting numerous records precursor disturbance severely flooded storm severely damaging roads coast storm produced wave height near resultant flooding destroyed houses affecting people country cyclone killed people storms addition named storms tracked seven tropical disturbances tropical depressions year short lived receiving warnings systems developed tropical storm october weeks early august middle winter southern hemisphere area warm water temperatures persisted northeast portion basin region unaffected progression usually decrease water temperatures august area convection persisted east association near trough later developing low pressure area defined circulation august system organized tropical disturbance tropical depression day storm month august august august initiated advisories depression moved southward developing defined central dense overcast despite presence northerly wind shear august anticyclone turned depression eastward day estimated peak minute winds mph estimated peak minute intensity mph depression later began weaken influence approaching trough dissipating crossed australian region august tracked circulation days estimating system turned sharply west circulation dissipated august month later area convection developed near trough near persistent warm water temperatures september classified day initiated advisories storm northeastern portion basin fairly unusual event average storms month september southern hemisphere located northern ridge storm tracked westward failed intensity minute winds mph wind shear september storm dissipated west southwest january ceased issuing advisories australian region previously moved western_australia system continued west entering south west indian_ocean january january remnants slowed turned southeast day began advisories storm executed small loop process reached peak minute winds mph turned southwest ceased issuing advisories january days later circulation dissipated january briefly tracked tropical cyclone australian region entered south west indian_ocean january time storm peak minute winds mph quickly weakened dissipated january tropical disturbance developed late november disturbances formed weeks january duration developed january tropical cyclone formed february tropical disturbances formed final developed originated late february tropical disturbance formed northeastern portion basin later crossed australian region intensify final disturbance season originated persistent area convection near equator july northeast warm water temperatures system developed tropical depression july july depression day classified storm tropical cyclone considers tropical cyclone year begin july considered beginning august time storm different cyclone years different agencies estimates dvorak technique suggested system approached tropical storm status july central dense overcast formed estimated peak minute winds mph moving southwestward later west depression began weakening wind shear july dissipated days later time july annual tropical cyclone year change policy shifted end tropical cyclone year june beginning
1996–97 South-West Indian Ocean cyclone season