pacific typhoon season pacific typhoon season official bounds ran year round tropical cyclones tend form northwestern pacific_ocean november dates conventionally period year tropical cyclones form northwestern pacific_ocean tropical storms formed entire west pacific basin assigned tropical depressions enter form philippine area responsibility assigned result storm having names total tropical depressions formed year tropical storms storms reached typhoon intensity reached super typhoon strength seven tropical cyclones moved philippines season tropical cyclone formed march final tropical cyclone dissipating december tropical cyclones accounted percent rainfall hong_kong season lowest percentage season summary season started fourth march typhoon basin system passed west dissipating march formed mid april near upper level low east guam bringing island heavy rainfall holly formed middle tropical pacific ocean late april dissipated far land system form living second week june taiwan extratropical cyclone june formed week june moved east taiwan approaching japan cyclone kelly crossed philippines july moving vietnam july moved nearby northern philippines making landfall mainland china july tracked near taiwan china eventually vietnam remnant low fourth weeks july formed northeast fringe moving mainland china july days moved japan end july approaching korea early august tropical depression formed tropical west pacific dissipating east asia august formed remained southeast japan august august roy august august susan moved northwest open western pacific second week august moved north northeast life cycle moving japan august moved northeast open western pacific mid august warren moved west northwest northern vietnam week august moved extremely close eastern china dissipating september bill southeast japan week september moved west northwest near mainland china week september moved central pacific week september south japan beginning october moved westward philippines vietnam second week october gay near japanese coast october tropical depression moved west northwest vietnam november moved mainland china november moved northern philippines south taiwan late november jeff east mainland asia late november kit moved westward philippines mid december lee moved central philippines dissipating december storms tropical depression typhoon tropical cyclone western pacific fourth typhoon occur march disturbance nearly stationary near days drifting northwest slowly intensifying morning march upgraded tropical depression tracked periphery subtropical ridge slow development days march intensification rapid typhoon passing kilometres west maximum sustained winds knots intensity island sustained wind gusts typhoon force waves metres typhoon moved northeast cyclone weakened absorbed march extratropical cyclone severe tropical storm cyclone initially formed response mid upper level cyclone southeast april thunderstorms developed near upper level system outflow pattern present satellite imagery surface circulation april system tropical depression night steady intensification seen midday april new upper level high formed east inducing southerly vertical wind shear weakening began storm located kilometres east guam late april moderate heavy rainfall occur island millimetres millimetres measured passing guam remaining thunderstorm activity away leaving low level moved northwest cyclone absorbed system approaching main belt april tropical storm holly broad area thunderstorm equator international date line beginning april tropical system southern hemisphere interacting strong system main belt time convective increased north equator low level circulation forming near late april midday april tropical depression continued westward holly tropical storm april typhoon late southwesterly vertical wind shear began weaken cyclone causing holly dissipate open pacific ocean severe tropical storm cyclone formed end monsoon transition season noon june broad area lowered pressures seen west philippines moderate northeast wind shear displaced mid level center far kilometres surface center development midday june strengthened tropical storm closest approach hong_kong winds knots upper trough main belt moved asia turned northeast intensification continued accelerated typhoon late june cyclone reached peak intensity landfall island taiwan weakening substantially mountainous island attempted slight tropical redevelopment extratropical cyclone late morning june perished taiwan philippines typhoon june tropical upper trough located early june response tropical disturbance formed upper cyclone disturbance northeast led development disturbance cell moved disturbance northwest intensification sped low level circulation center formed june kilometres north afternoon june cyclone tropical storm june tracked northwest taiwan late june reached maximum intensity typhoon kilometres southeast june north gradually weakened approaching japan cyclone linked frontal boundary extratropical cyclone late june severe tropical storm kelly tropical disturbance organized tropical depression east philippines june tracked westward reaching tropical storm june hitting central philippines kelly weakened islands attaining typhoon status july typhoon hit southern july bringing wind gusts knots hong_kong cyclone crossed weakening tropical storm landfall northern vietnam july tropical storm maximum sustained winds knots kelly dissipated day causing torrential flooding mudslides resulting casualties leaving thousands homeless severe tropical storm morning june area enhanced thunderstorm activity spotted south weak portion monsoon trough tropical storm kelly led vertical wind shear system disturbance slow organize low pressure area formed late june late july kelly negative influence disturbance allowing development early july system developed tropical depression afternoon tropical storm previously moving fast pace west cyclone slowed passed northern fringe philippines led convection focusing terrain philippines distorted convective pattern second tropical cyclone days impact philippines cyclone took hours track northern portion archipelago took late july storm recover philippine interaction central dense overcast pace west turning northwest light moderate easterly wind shear prevented development typhoon cyclone struck china early july heavy rainfall led mudslides took lives left tens thousands homeless hong_kong winds knots total millimetres rainfall recorded tropical depression severe tropical storm morning july satellite imagery revealed area convection kilometres north northwest late july mid level center formed association thunderstorm complex moving northwest ship reports indicated system tropical storm morning july southwesterly vertical wind shear impacted led northeast height early july wind shear cyclone structure improved approaching china strong ridge northwest storm westerly heading sending center taiwan ridge led weak east northeasterly vertical wind shear halted development late july cyclone center moved ashore northern taiwan heavy rains led significant flooding loss lives moving weak tropical storm second landfall near china morning july remains dragged southwest upper cyclone southeast late july circulation center moved north near china dissipated inland late july thunderstorm activity surface center offshore moved inland near vietnam dissipating late july tropical storm eastern portion large convective mass led formation noted late july east taiwan moved northwest northern taiwan late morning july late afternoon surface low formed convective activity designated tropical depression moving northwest knots cyclone briefly tropical storm nearly land weakening tropical depression early morning july center landfall northwest china quickly dissipating mountainous terrain inland severe tropical storm area convection active previous hours led formation low level circulation near early july gradual intensification ensued system developed tropical depression evening tropical storm july typhoon july moved west northwest cyclone struck southern japan early july weakened cyclone tropical storm moved continuing spin upper level wind shear took toll leading weakening tropical depression ultimate dissipation west coast korea tropical storm tropical depression tropical storm associated scale feature similar july monsoon trough extended islands southeast opposite ends trough tropical depression formed north guam late july moving northeast tropical depression experienced vertical wind shear upper anticyclone development accelerated faster tropical depression led dissipation late morning august severe tropical storm second circulation monsoon trough spawned tropical depression noted north late august developed tropical storm tracking northward knots cyclone intensified slowly westerly vertical wind shear increased vertical wind shear southeast cooler sea surface temperatures led decline late august dissipated tropical cyclone early august remains tracked northeast merging extratropical cyclone offshore japan perished people left homeless japan tropical storm roy initial disturbance formed east vietnam days august august low level circulation present moving slowly north low pressure area developed central convection late august disturbance strengthened tropical depression reaching tropical storm strength august easterly shear began soon roy circulation center exposed east main convection caused subsequent weakening dissipation reaching winds knots northwest hong_kong airport severe tropical storm susan monsoon trough established degrees north latitude east monsoon trough shifted east western portion moved north early august tropical disturbance noted kilometres north time wake experienced gale force winds heavy rainfall low level center exposed time continued late august convection edge surface low strengthened vertical wind shear weakened point gale center deemed tropical cyclone named susan storm tracked north reaching degrees north latitude turning northwest weak cold early august susan cooler drier air frontal zone led significant reduction thunderstorm activity warm core ridge building northeast forced storm west northwest course second cold approached susan boundary extratropical cyclone late morning august tropical depression active monsoon trough spawned tropical cyclones hours beginning august trio initially noted august near august limited outflow witnessed low level circulation system developed tropical depression late august moved north northeast typhoon late morning august august accelerated northward subtropical ridge east deepening west striking eastern japan forward motion near knots cyclone rapidly transitioned extratropical cyclone late august died passage japan severe tropical storm system developed kilometres south near merger monsoon trough sharp surface trough brought region susan thunderstorm activity increased area august system monsoon trough freed nearby low pressure lost primary outflow channels northeastward movement subsequently exposed system main belt days formation tropical cyclone devoid convection transitioning extratropical cyclone morning august exposed surface circulation tracked additional couple days merging mid latitude system near morning august tropical storm warren initial disturbance led warren formation formed monsoon trough august strong northeasterly wind shear halted development days august vertical wind shear relaxed thunderstorms increased south center moving slowly westward system tropical storm afternoon august warren tracked intensification renewed maximum sustained winds leveled knots cyclone final landfall near vietnam august dissipated rapidly evening august defined moved westward international date line august surface cyclone developed vicinity near extensive area disorganized thunderstorm activity developed southwest initially convection moved westward upper level outflow improved northeast guam defined mid level cyclone passed north island morning august low level center began form area moved northwest guam early morning august tropical depression formed kilometres west northwest guam development continued system tropical storm evening moving west northwestward typhoon morning august following day intensifying typhoon passed kilometres southwest okinawa entering region hostile northerly vertical wind shear began weaken central convection completely gone morning september remained south korea september rainfall heaviest 20th century time millimetres fell peninsula remains passed september total lives taken typhoon bill initial disturbance formed kilometres east southeast september compact system area central convection kilometres wide bill rapidly spun tropical storm september typhoon september central pressure high winds intensity pressure gradient cyclone subtropical ridge northeast typhoon followed classic track periphery subtropical ridge east japan weakening tropical storm september rapid extratropical transition occurred bill interacted main belt midnight bill extratropical cyclone monsoon trough spawned tropical depression september east philippines depression moved west northwest strengthening tropical storm september typhoon september rapidly intensified peak winds knots september northern circulation disrupted steadily weakened continued northwest hitting southeast china 21st typhoon winds knots hong_kong winds knots caused extensive damage deaths leaving thousands homeless heavy rains typhoon like bill typhoon spent life open pacific ocean initial disturbance detected near september cyclone built surface moving westward tropical storm afternoon september typhoon following day subtropical ridge accelerated rapidly northeastward weakening cool waters merging frontal zone extratropical cyclone early morning september near super typhoon monsoon trough september september wake small thunderstorm area formed near late morning september slowly developed tropical depression early september development steady tropical storm later day typhoon morning september super typhoon afternoon september maintaining intensity september moved curve subtropical ridge northeast east moving offshore japan typhoon october october october interaction upper trough led transitioned typhoon extratropical cyclone tropical depression tropical storm area active disorganized thunderstorm activity located northeast october moving westward days little change organization approached passing philippines lost convection near center let heavy rainfall flooding surface circulation apparent disturbance entered redeveloped reached tropical depression strength afternoon october crossed sea struck bay vietnam october cyclone dissipated inland typhoon gay system formed large area thunderstorm activity system originally large circulation center led problems fixing center satellite imagery development large eye october finally led tracking definitive defined circulation center typhoon brought relief drought conditions okinawa millimetres rainfall fell circulation center gay moved kilometres southeast continued moving japan center passed kilometres tokyo bringing significant rainfall central portions island archipelago typhoon ultimately merged second low pressure system moving eastward north japan tropical depression system recognized tropical depression formed november moved inland vietnam 10th tropical disturbance developed trough east guam circulation improved low pressure center formed november tropical depression morning november tropical storm evening moving general westward track western pacific moved northern afternoon november bringing gusts approaching typhoon force moved kilometres north guam reaching typhoon strength early november intensity fluctuated november november interacted nearby frontal zone weakening neared philippines moved south entering recovering mountainous archipelago struck vietnam kilometres east northeast dissipated entered southeast china super typhoon super typhoon developed near trough november tropical depression headed westward steadily intensified tropical storm november later typhoon november quickly strengthened november super typhoon maximum winds knots outflow disrupted philippines southwest hit northern philippines november maximum sustained winds knots rapidly weakened country weakened tropical storm turned northeastward absorbed cold november total fatalities million damage usd attributed typhoon tropical storm jeff distinct surface circulation formed november jeff tropical storm november heels approaching guam navigating break subtropical ridge dissipated cooler waters november increasing vertical wind shear south japan strong long lived tropical cyclone december initial low level center system formed southwest december december moved southwest development morning december structure improving afternoon tropical depressions formed late december evolved tropical storm slow moving system kit shifted northwest westerly heading passing south guam development intensification resumed following days reaching peak intensity december storm moved sharply northward second time slow rate motion resuming westward motion northeast surge trade winds occurred upper trough north acted outflow channel kit reached peak intensity evening december increasing aloft began weaken cyclone december surface circulation began emerge south central convection kit steered low level flow south southwest deck december kit tropical depression afternoon longer qualified tropical cyclone late december low level cloud moved dissipating kit dissipating western december disturbed area weather organized west strong previously diverted kit closed portion monsoon trough near gale force winds wrapping convection development continued afternoon december system classified tropical depression tropical storm status achieved night moving west northwest lee intensified rapidly typhoon december reaching peak intensity december rapid weakening began lee crossed philippines cyclone tropical storm december christmas day december cyclone convection removed east circulation center moderate strong westerly vertical wind shear turning north lee dissipated tropical cyclone kilometres south hong_kong total perished cyclone passage storm names season named tropical cyclones developed named determined tropical storms names contributed revised list started philippines uses naming scheme tropical cyclones area responsibility assigns names tropical depressions form area responsibility tropical cyclone area responsibility list names given year prove insufficient names taken auxiliary list published year season starts names retired list season list season uses naming scheme starts filipino alphabet names filipino female names ending etc names assigned going use marked gray retirement unknown possibly damage retired later replaced season season effects table list storms developed northwestern pacific_ocean west international date line north equator include intensity duration areas affected deaths damage totals classification intensity values based conducted peak wind speeds minute sustained standards noted damage figures usd damages deaths storm include storm precursor wave extratropical low
1981 Pacific typhoon season