south west indian_ocean cyclone season south west indian_ocean tropical cyclone season record storms struck tropical cyclone intensity maximum sustained winds mph notable storm season longest lasting storm record basin lasted days traversing southern indian_ocean making strongest landfall decades eastern madagascar late february storm series storms struck country early march april collectively storms killed people season started november ended basin april mauritius season continued dates conventionally period year tropical cyclones form basin despite destructive nature season began later usual cyclone originated end december bringing rainfall gusty winds northern madagascar region january cyclones formed east madagascar took southerly tracks passed near producing rainfall mountainous peaks killing people longest lasting storm season struck country experiencing worst flooding years collectively causing deaths million damage storm killed people south_africa weeks struck madagascar tropical storm affected general region bringing additional deaths damage april strongest storm season reaching peak minute winds mph caused deaths effects worse madagascar deaths final storm season tropical storm dissipated april addition named storms unnamed tropical disturbances storms subtropical cyclone formed southern season summary france office island issued warnings tropical cyclones basin season agency estimated intensity dvorak technique utilized continuous satellite imagery basin wind estimates sustained minutes converted minute winds dividing compared previous years warnings tropical cyclones region coast africa south equator joint united_states navy united_states_air_force task force issued tropical cyclone warnings region beginning season changed method labeling tropical disturbances classifying number previous years agency labeled disturbances letter number subsequent unnamed storm season began later usual consecutive indications tropical cyclogenesis middle december putting season latest terms seasons storms december utilized satellite time basin assess storm intensity season tropical disturbances formed near average tended longer normal disturbances tropical depressions attained gale force winds named addition storms reached tropical cyclone intensity minute sustained winds mph named storms tropical cyclones basin average category given year days storm active greater median double previous season general storms formed south exception storm storms generally tracked east west strong ridge east madagascar storms severe tropical storm december circulation accompanying convection evident southeast tropical disturbance moving south thunderstorms organized aided low wind shear good outflow warm waters position beneath anticyclone curving west southwestward ridge south system intensified tropical depression later tropical storm december day classified system tropical cyclone storm developed large area convection prompting upgrade severe tropical storm december estimating minute winds mph december upgraded equivalent minimal hurricane appearance eye feature estimating minute winds mph later day storm weakened unexpectedly related wind shear trough south convection deteriorated markedly weakening storm turned west northwest december weaker ridge convection reorganized slightly center early december storm passed northeast curving west struck northeastern madagascar december minimal tropical storm emerged tropical depression despite forecasts contrary tropical storm passing near january early day weakened tropical depression status moving ashore eastern near dissipating soon brought strong winds including minute sustained winds mph gusts mph damage reported madagascar storm passage passed south brought gusts mph strong knock banana trees destroy stone house storm dropped rainfall hours including millimetres hour heavy rainfall accompanied final landfall penetrating far inland beginning january remained active basin low pressure widespread thunderstorms area persisted southeast organized sufficiently classified tropical disturbance january day issued tropical cyclone formation noting increase convection system moved northeast southeastern edge ridge near equator turned southwest january day convection increased center having previously wind shear late january initiated advisories day upgraded system storm accelerated southwest continued intensity irregular eye formed january prompting upgrade tropical cyclone status outflow eye pronounced strengthening cyclone attained peak minute winds mph january contrast estimated peak minute winds mph time peak intensity began turning south approaching trough late january cyclone passed east increased shear weakened eyewall convection weakened cyclone status january early day discontinued advisories storm beginning extratropical followed suit later january agency continued track storm shifted south southwestward january resuming southeast trajectory influenced ridge south january remnants passed west gusts reached mph later day storm merged trough originally turned southeast intense tropical cyclone area thunderstorms formed january east northern tip madagascar organizing tropical disturbance days later late january upgraded system day initiated advisories storm favorable conditions gradually organized initially stationary later beginning steady southeast motion january upgraded storm equivalent minimal hurricane january time upgraded tropical cyclone status storm eye defined winds increased estimated peak minute winds mph january day estimated peak minute winds mph increased shear weakened storm curved southwestward late january passed northwest storm turned southeast extratropical february dissipating day passing northwest mauritius outer fringes brought heavy rains peaking span days equivalent month worth precipitation rains helped relieve extreme drought conditions storm produced gusts mph person died falling roof storm brought heavy rainfall totaling occurred hours wind gusts reached mph france roads island damaged people lost power homes destroyed persons killed people left homeless agriculture sector suffered significant damages overall damage minor moderate tropical storm monsoon trough spawned produced area convection southeast january circulation slowly organized classified tropical disturbance january nearby trough steered system southeastward initially later southwest january system tropical depression later moderate tropical storm day reaching peak winds mph february initiated warnings estimated minute winds mph increased wind shear removed convection february causing marked weakening prompting advisories day despite forecasts strengthening near tropical cyclone status weak tropical disturbance turned rapid westward motion passing north circulation dissipated february northeast coast madagascar intense tropical cyclone february low pressure area formed monsoon trough south indonesia eventually tropical cyclone australian basin tropical cyclone according storm tracked westward indian_ocean fluctuating strength changes atmosphere crossing began tracking system february storm continued westward indian_ocean intensified greatly approached east coast madagascar late february landfall near minute winds mph making strongest storm hit country decades storm rapidly weakened land reach peak minute winds mph february landfall south near peak intensity quickly weakened land defined circulation moved southern african finally dissipating eastern february duration lasted days record longevity storm south west indian_ocean track earth struck madagascar midst cholera epidemic killed people storm directly killed people madagascar struck shortly damage making difficult individual damage totals damage estimated million collectively storms killed people country destroyed half rice harvest left homeless region landfall houses damaged crops lost health facilities wrecked struck worst floods affected nation january killing people additional rainfall flooding created country worst natural disaster century combined effects destroyed acres crop fields killed cattle passage disrupted ongoing relief efforts port blocked weeks sunken ships high levels isolated town water levels river reaching high normal areas wide dam broke river flooding town middle night trapping unprepared residents people drowned rescue helicopters arrived late save people capital city lost homes addition floods strong winds blew away roofs entire houses mud combined effects preceding floods left people homeless deaths damage estimated million usd cyclone floods disrupted economic progress 1990s end civil war southern africa brought strong winds heavy rainfall crossed eastern maintaining defined structure rivers overflowed banks country damaging crops houses leaving people homeless storm killed people country flooding storm extended southward south_africa country dropped rainfall days causing reach highest level years officials opened dams prevent structural damage caused higher levels river east people died country people left homeless forcing people churches schools damage estimated million usd north dropped rainfall southern gusty winds caused power farther west rainfall rates reported severe tropical storm making landfall madagascar area convection formed east february structure similar monsoon depression large circulation weak winds near center organized classified tropical disturbance february southeast moved southeastward increasing convection prompting tropical depression february convection remained disorganized small broad turning southwest nearby trough circulation compact evidenced pass outflow increased wind shear decreased moderate tropical storm february day initiated advisories storm tropical cyclone late february upgraded storm equivalent minimal hurricane estimated peak minute winds mph based wide eye feature developed storm center time peak intensity passed southeast interaction trough ridge east increased wind shear causing storm weaken february storm extratropical maintaining defined circulation slowed looped northwest ridge south gradually defined dissipating february severe tropical storm february circulation formed monsoon trough displaced wind shear organized track tropical disturbance shear gradually decreased allowing thunderstorms organize moved westward february classified system february upgraded tropical depression status depression turned west northwestward rounding ridge turning southwest thunderstorms organized central dense overcast march prompting upgrade northeast coast madagascar continued quickly southwest gradually intensifying developing eye feature basis estimated peak minute winds mph severe tropical storm status time landfall north operationally upgraded equivalent minimal hurricane minute winds mph agency downgraded storm peak structure initially remained defined circulation difficult locate progressed country march system exited madagascar scattered thunderstorms slowly reforming day discontinued advisories continued monitoring system labeling tropical disturbance march later day landfall near southeastern turning southward drift dissipating march developing disturbance produced winds approaching gale force similar conditions reported struck madagascar produced sustained winds mph south storm brought heavy rainfall reporting day total rains occurred weeks struck country bringing additional flooding landslides damage near moved ashore storm killed people destroyed hundreds homes damaged road connecting area capital madagascar farther inland cyclone killed people overall killed people exact toll initially unknown disrupted communications emerged news outlets noted potential storm affect storm ravaged minimal rainfall accompanied final landfall rains delay flights day transporting relief aid following devastating landfall intense tropical cyclone tropical low formed australian basin march moving westward strong subtropical ridge south despite having intensified system march system crossed south west indian_ocean named eye formed storm intensified tropical cyclone march southeast structure fluctuated dry air able intensify steadily march conditions favorable day upgraded intense tropical cyclone estimating peak minute winds mph contrast estimated minute winds mph maintained peak winds making landfall southeast madagascar april weakened greatly land like intensified attained tropical cyclone status april reached minute winds mph time landfall near april dissipated day vicinity brought moderate winds cyclone affected parts madagascar previously impacted waves reached height coast storm considered worst affect region years homes destroyed estimated storm left people homeless madagascar deaths damage expected storm affected areas farther north country struck heavy rainfall occurred coast insufficient cause river flooding strong winds damaged roofs downed trees storm killed people subtropical depression april cold exited southeast coast africa producing small circulation day southeast april system organized subtropical depression gradually separated dissipating cold ridge south steered depression northward system better defined persistent wind shear initially prevented convection organizing center april depression turned northwestward thunderstorms increased aided decrease wind shear shift jet stream center came close coast near small radius maximum winds coastline spared strong gusts system dropped rainfall hours storm turned east april away land convection organized eye feature weaker thunderstorms typical tropical cyclones resulting subtropical classification estimated peak minute winds mph april noting system named structure recent basin issued tropical cyclone formation issued advisories increase wind shear deteriorated eye feature convection promptly causing weakening april circulation dissipated southwest coast madagascar moderate tropical storm final storm year origins australian basin area convection persisted april southwest indonesia developing distinct center days later moving west thunderstorms unable organize wind shear april estimated system tropical disturbance east agency issue advisories time day system crossed basin classified tropical disturbance days convection waned strongest winds northern periphery april began tracking system tropical cyclone disturbance maintained general west southwest trajectory influenced ridge south slowing encountering favorable environment system intensified april reaching peak minute winds mph operationally upgraded storm status day earlier upgrade maintained depression time return wind shear caused weakening beginning april weak circulation persisted days turning northwest brief increases thunderstorms april dissipated circulation drew moisture south produce heavy rainfall mauritius peaking storms half january thunderstorms persisted january classified area convection tropical disturbance agency ceased issuing advisories day convection persisted associated exposed circulation january days later issued bulletin system dropping advisories tracked system area potential development january thunderstorms weakened disturbance brought heavy rainfall southwestern madagascar followed prolonged drought rainfall hours accumulated average yearly total caused flooding damage crops preceded devastating flooding affected nation subsequent months end february produced large area convection eastern portion basin spawn disturbances february tropical disturbance formed system southeast convection organized slightly despite easterly wind shear left circulation exposed march classified tropical cyclone estimating winds tropical storm force day contrast classified tropical depression moving generally southwestward convection weakened march wind shear circulation steered west northwest nearly dissipating march thunderstorms reorganized possibly influence monsoon turned east possibly interaction approaching cyclone norman australian basin convection soon diminished depression system dissipated march near march tropical disturbance formed system spawned previous depression farther west encountered wind shear preventing intensification system remained nearly stationary failed organize issued advisory march issued briefly entered basin march dissipating storm names tropical disturbance named reaches moderate tropical storm strength tropical disturbance reaches moderate tropical storm status west sub regional madagascar assigns appropriate storm tropical disturbance reaches moderate tropical storm status sub regional mauritius assigns appropriate storm new annual list year names retired
1999–2000 South-West Indian Ocean cyclone season