atlantic hurricane season atlantic hurricane season extremely active tied having named storms record season officially began june ended november dates conventionally period year tropical cyclones form atlantic_ocean system year developed earliest date formation tropical storm second tropical cyclone developed later month occurrence pre season named storms atlantic basin moved ashore north florida winds mph making strongest pre season storm landfall atlantic basin season marked time tropical cyclones formed july record set later season system fourth longest lived tropical cyclone recorded atlantic total duration days final storm form tony dissipated october formed tony extratropical october pre season forecasts called average season named storms hurricanes major hurricanes issued outlook predicting total named storms hurricanes major hurricanes agencies noted possibility limits tropical cyclone activity following pre season storms updated forecast named storms hurricanes major hurricanes forecast numbers named storms hurricanes major hurricanes august despite activity far surpassed predictions impact season widespread significant mid moved ashore coastline florida causing deaths late june early august tropical storm hurricane caused deaths striking florida respectively mid august remnants tropical storm killed people making landfall mexico deaths billion attributed hurricane struck louisiana separate occasions late august far deadliest cyclone season hurricane sandy formed october striking cuba category intensity saffir simpson hurricane wind scale hurricane moved ashore southern coastline new_jersey sandy left dead billion worth damage wake making second atlantic hurricane record hurricane katrina collectively season storms caused fatalities billion damage making deadliest season seasonal forecasts advance hurricane season forecasts hurricane activity issued national meteorological services scientific agencies noted hurricane experts include forecasters united_states climate prediction center associates tropical storm risk forecasts include weekly monthly changes significant factors help determine number tropical storms hurricanes major hurricanes particular year stated average atlantic hurricane season contained roughly tropical storms hurricanes major hurricanes ace index units typically season average average average based cumulative ace index number tropical storms hurricanes major hurricanes hurricane season considered occasionally pre season forecasts december tropical storm risk public consortium consisting experts insurance risk management seasonal climate issued extended range forecast predicting average hurricane season report noted tropical cyclone activity average tropical storms hurricanes major hurricanes anticipated cumulative ace index later month december issued extended range forecast predicting near average hurricane season forecast noted cooler seen decade combined weakening result near average season named storms hurricanes major hurricanes predicted near average probability hurricane landfall slightly elevated chance gulf_coast united_states slightly reduced chance east_coast united_states april issued updated forecast season calling normal season increased chance development season april issued update forecast season slightly predictions released forecast season predicting near normal season named storms hurricanes major hurricanes based forecast higher wind shear cooler temperatures high activity era known atlantic warm phase began lead seasonal added main uncertainty outlook season high end predicted range reached dependent develops stays current neutral phase day issued forecast average season predicted named storms chance number issue forecasts number hurricanes major hurricanes predicted ace index chance index range issued annual atlantic hurricane season forecast organization predicted named storms including hurricanes ace index mid season june team issued updated forecast season predicting thirteen named storms hurricanes intensify major hurricanes university stated high uncertainty concerning develop time hinder tropical development atlantic basin stated lower average chance major hurricane united_states coastline june tropical storm risk released second updated forecast season predicting fourteen named storms hurricanes major hurricanes addition agency called index near average sea surface temperatures slightly elevated trade winds cited lower activity compared hurricane seasons tropical storm risk continued forecast near average probability united_states impact season long term normal slightly average chance united_states landfall recent normal august issued mid season outlook remainder season final numbers agency predicted seventeen named storms hurricanes major hurricanes cited warmer normal sea surface temperatures continuation high activity era atlantic basin season summary atlantic hurricane season officially began june average season tropical cyclones formed nineteen depressions attained tropical storm status hurricanes hurricanes intensified major hurricanes season average likely neutral conditions pacific_ocean hurricanes tropical storms landfall season caused deaths billion damage additionally caused losses fatalities struck land storm season dissipated october month official end hurricane season november tropical cyclogenesis began month tropical storms occurrence pre season tropical storms atlantic additionally regarded strongest pre season tropical cyclone landfall united_states record june systems hurricane chris tropical storm tropical cyclones developed month july phenomenon activity resumed august development hurricane total tropical storms august ties record set tropical cyclones formed september systems existed month originated august michael major hurricane season september peaked category hurricane developed september extratropical september developed september subsequently lasted october total duration days fourth longest lasting atlantic tropical cyclone record hurricane hurricane october tropical cyclones tropical storms oscar tony sandy average record activity month october hurricane sandy final named storm tony extratropical october ending cyclonic activity season accumulated cyclone energy ace season activity reflected accumulated cyclone energy ace rating average broadly speaking ace measure power tropical subtropical storm multiplied length time existed storm long duration particularly strong hurricanes michael high values ace calculated advisories specific tropical subtropical systems reaching exceeding wind speeds mph accordingly tropical depressions included storm dissipated typically end season nhc data produces final report storm revisions lead revised ace total upward downward compared operational value final reports issued aces provisional storms tropical storm non tropical area low pressure formed stationary offshore carolinas stationary offshore south_carolina producing organized convective activity day quickly gained tropical characteristics warm waters utc system tropical storm named storm form atlantic basin arthur combined occurrence tropical cyclone atlantic located east attained tropical storm intensity prior start respective hurricane seasons utc ship near reported winds mph indicating storm stronger previously assessed early minimum barometric pressure mbar inhg reported little strengthening occurred hours fact slight weakening occurred night southeasterly shear dry air began impact system leaving center exposed east circulation remaining minimal tropical storm hours storm weakened tropical depression early moved northeastward sea early degenerated remnant area low pressure failing maintain convection time located miles south southeast cape_hatteras north_carolina storm active produced waves prompting ocean rescues tropical storm weak disturbance formed southwest cuba disturbance moved north low pressure system located offshore north_carolina developed subtropical storm storm slowly acquired tropical characteristics tracked warmer waters environment decreasing vertical wind shear late transitioned tropical cyclone miles time storm attained peak intensity maximum sustained winds mph minimum barometric pressure mbar inhg early landfall near florida winds mph storm strongest pre season tropical cyclone landfall record quickly weakened tropical depression dropping heavy rainfall moving slowly cold turned northeast storm extratropical located near southeast coast north_carolina precursor produced heavy rainfall cuba causing flooding mudslides damaged destroyed homes resulted deaths torrential rain affected bahamas forming produced rough surf southeastern coast leaving person south_carolina missing making landfall florida storm produced strong winds left people power high rains drought conditions storm path fallen tree killed man driving south_carolina northeast north_carolina spawned tornado snapped trees damaged dozens homes near city overall damage minor estimated hurricane chris june low pressure area cut stationary frontal boundary near bermuda warm seas light wind shear system subtropical storm chris june deep convection persistent national_hurricane_center reclassified tropical storm chris june despite ocean temperatures strengthened hurricane june later day chris peaked maximum sustained winds mph minimum barometric pressure mbar inhg encountering colder waters weakened tropical storm june chris transitioned extratropical cyclone utc interacting extratropical low pressure area south precursor chris produced days rainfall bermuda june totaling june system produced heavy precipitation reaching location daily record combined high tides localized flooding occurred poor drainage areas especially sustained winds peaked mph gusts reached mph june system rapidly organizing gale warnings issued island bermuda transitioning extratropical cyclone pressure gradient associated chris nearby non tropical low produced gale force winds additionally swells area reached chris earliest named storm recorded history formed june record broken tropical storm trough low pressure central gulf mexico developed tropical storm utc june located miles south southeast mouth mississippi_river despite projected track landfall louisiana texas storm headed opposite direction moving slowly north northeast northeastward steadily strengthened utc june storm attained peak intensity maximum sustained winds mph minimum barometric pressure mbar inhg dry air westerly wind shear prevented intensification instead weakened late june minimal tropical storm utc storm landfall near florida winds mph continued weaken crossing florida extratropical june remnants shortly emerge atlantic finally dissipated june tropical storm dropped immense amounts precipitation near path rainfall peaked inches florida located southwestern reached record height flooded structures additionally reached highest level hurricane south overflowed flooding communities head deep water causing damage homes additional homes inundated overflowed roads highways left impassable interstate route coastal flooding inundated routes damage primarily caused tornadoes caused fatality overall resulted million losses deaths florida alabama south_carolina hurricane tropical wave developed august located miles east lesser antilles wind shear initially caused depression remain weak august upgraded tropical storm day entered caribbean_sea storm approached western caribbean august wind shear dry air briefly halted strengthening convection diminished exposing low level circulation somewhat defined wind shear dry air decreased regained deep convection hurricane august early august landfall winds mph hours later minimum barometric pressure mbar inhg recorded weakening tropical storm moving storm struck veracruz august weakened mexico dissipated august remnants contributed development tropical storm eastern pacific despite light rainfall gusty winds islands puerto_rico impact lesser antilles rip currents coast florida panhandle resulted rescues portion store city washed away mexico officials reported people lost power roads damaged state freshwater flooding occurred coast bay including veracruz flooding landslides mountainous areas veracruz officials indicated houses partially damaged flooding veracruz flooding occurred inland association remnants guerrero municipalities impacted fatalities reported overall responsible deaths million damage tropical storm florence early august defined tropical wave accompanied disorganized convection exited west coast africa located region low wind shear warm waters low pressure area developed increasingly better defined drifted west northwest organized appearance microwave satellite imagery estimated tropical depression formed utc august located miles south southwest southernmost islands cape_verde formation subsequent increase wind shear led slow organization despite depression intensified tropical storm florence utc following day central dense overcast pattern prominent spiral banding developed later august indicating storm strengthening utc august florence attained peak intensity maximum sustained winds mph minimum barometric pressure mbar inhg weakening soon occurred dry air diminished coverage intensity convection early august florence downgraded tropical depression low level circulation subsequently exposed cyclone degenerated non convective remnant area low pressure utc located midway cape_verde lesser antilles tropical storm defined tropical wave crossed west coast africa august fluctuated convective organization days late august national_hurricane_center initiated advisories tropical depression seven located midway cape_verde lesser antilles moving rapidly westward depression began southwesterly wind shear depression degenerated open tropical wave august hurricane hunters flight failed locate closed circulation depression degenerated open tropical wave remnant tropical wave produced heavy rainfall trinidad causing flooding mudslides island trinidad fatalities widespread damage resulted flooding mudslides losses exceeding million million remnants monitored possible redevelopment following days august system moved inland central_america longer expected despite earlier predictions remnants storm moved began consolidate august hurricane hunter aircraft system indicated tropical depression utc august hours strengthening tropical storm shortly peaked winds mph minimum barometric pressure mbar inhg early august weakened tropical depression moving northwestward utc landfall near mexico quickly weakened dissipated utc august mexico brought moderate rains areas previously affected communities city veracruz reported street flooding hurricane gordon tropical wave emerged atlantic_ocean west coast africa august passing cape_verde moved generally west northwestward crossed region colder seas result tropical cyclogenesis convective activity remained minimal low pressure system turned northerly direction warmer waters environment favorable organization system attained deeper convection better defined circulation estimated tropical depression developed utc august located miles east southeast bermuda depression strengthened approximately hours later tropical storm gordon tropical storm august gordon turned eastward continued intensify relatively light wind shear august upgraded hurricane storm peaked winds mph minimum barometric pressure mbar inhg following day weakening colder ocean temperatures increasing shear utc august gordon struck azores half hours weakening tropical storm later day transitioned extratropical low pressure area homes sustained broken doors windows streets covered fallen trees areas temporarily lost power storm moved electricity restored hours later torrential rains triggered localized flooding landslides hurricane tropical wave developed tropical depression utc august located miles east lesser antilles depression headed north west hours later strengthened tropical storm intensifying somewhat passed leeward_islands august islands reported tropical storm force winds light rainfall damage occurred unfavorable conditions primarily dry air reformation center caused remain disorganized eastern caribbean_sea early august landfall near haiti strong tropical storm strong winds heavy rain impacted numerous camps set haiti earthquake people losing shelter approximately houses destroyed resulting million damage deaths confirmed neighboring dominican_republic houses damaged cross loses reached approximately million deaths reported slightly disorganized haiti emerged caribbean_sea later august hours striking cuba winds mph homes destroyed sustained damage later august emerged southwestern atlantic_ocean banks initially storm posed threat florida passed southwest late august spawned tornadoes dropped isolated areas heavy rainfall causing severe local flooding especially neighborhoods wellington left stranded days tornadoes state destroyed structure caused damage reached gulf_of_mexico began strengthening trend reaching hurricane status august utc following day storm landfall near mouth mississippi_river louisiana winds mph hours later reported barometric pressure mbar inhg briefly moved offshore landfall near port winds mph utc august combination storm surge strong winds heavy rainfall left homes electricity caused damage houses resulted losses crops thousands people required rescuing homes vehicles flooding new_orleans area relatively unscathed built hurricanes katrina slowly weakened moving inland dissipated missouri september remnants continued generally eastward southern illinois moving southward kentucky september mid level circulation storm split parts portion continuing southward gulf_of_mexico eastward ohio remnants brought rainfall areas impacted ongoing drought united_states damage reached billion fatalities incurred state louisiana tropical storm tropical wave emerged atlantic west coast africa august system produced sporadic disorganized convection days moved westward eastern tropical atlantic late august defined surface low developed association tropical wave associated deep convection sufficiently organized utc august system organized designated tropical depression located miles west southwest cape_verde depression steered west northwest southern periphery deep layer subtropical ridge initially depression region light southwesterly shear seas moist mid level air conditions depression intensified slowly tropical storm utc august later day peaked maximum sustained winds mph minimum barometric pressure mbar inhg deep convection soon began diminish utc august system weakened tropical depression environment dry air coupled increase southwesterly vertical shear induced primarily upper level low northwest continued adversely affect storm august degenerated remnant low pressure area utc day dissipated shortly hurricane tropical wave emerged atlantic coast africa august accompanied broad area low pressure system moved slowly westward associated convective activity began organizing august near cape_verde little additional development occurred days circulation low elongated poorly defined system turned northwestward late august continued direction august despite presence vertical wind shear convection concentrated circulation better defined indicating developed utc august located miles southwest western azores depression initially moved westward turning northwestward august response weakness subtropical ridge minimal intensification predicted dry air wind shear strengthened tropical storm following day persistent wind shear slowed intensification decrease shear quickly strengthened hurricane august small eye appeared satellite imagery august storm peaked winds mph minimum barometric pressure mbar inhg weakened later day moving northward break subtropical ridge september fell tropical storm intensity accelerating northeastward weakened increasing shear decreasing sea surface temperatures utc september merged frontal system located miles north azores hurricane tropical wave developed located nearly miles east leeward_islands august hours later strengthened tropical storm tracking steadily west northwestward slowly intensified marginally favorable conditions september storm curved north northwestward located north leeward_islands blocking pattern atlantic_canada caused drift days late september upgraded hurricane shortly strengthening peaking intensity winds mph minimum barometric pressure mbar inhg slow movement storm caused decreased ocean temperatures weakening tropical storm september storm drifted september accelerated passing east bermuda relatively strong winds island caused hundreds power outages knocked tree branches electrical poles debris intensification occurred hurricane transitioning extratropical cyclone near newfoundland september atlantic_canada heavy rains fell nova_scotia newfoundland localized flooding occurred especially western portions province newfoundland strong winds ripped roofs downed trees left homes power additionally partially built house destroyed incomplete homes damaged cove overall caused million damage fatalities hurricane michael disturbance spawned defined low pressure area september located miles southwest azores low moved southwestward developed utc september moved westward northwestward strengthened tropical storm michael utc september located miles southwest azores initially predicted national_hurricane_center depression strengthened slightly extratropical september anticipated increase wind shear later september system entered region weak steering currents causing drift northeastward hours proceeding utc september storm rapidly intensified late september upgraded hurricane category hurricane early following day utc september storm reached category hurricane strength attained peak intensity maximum sustained winds mph minimum barometric pressure mbar inhg michael major hurricane season weakened category hurricane later september storm curved northwest briefly weakened category hurricane september cyclone turned westward september resumed weakening later day encountering wind shear generated outflow nearby hurricane michael weakened tropical storm accelerating northward september hours degenerated remnant low pressure area located west azores tropical wave developed tropical depression fourteen september located miles west cape_verde initially moved west northwest intensifying early september hours storm intensified quickly reaching winds mph early september maintained intensity hours break subtropical ridge caused storm curved northwestward followed turn north september later day storm upgraded hurricane september turned eastward north ridge following day began weakening downgraded tropical storm early september storm curved east northeastward eventually northeastward posing threat azores east southeastward cause relatively strong winds islands late september curved southward shortly non tropical low pressure area moving area favorable conditions early september storm drifted moved northeastern atlantic turning west northwestward september southwestward september curved westward september northwestward september day period minimal change intensity occurred remaining weak moderate tropical storm utc september storm strengthened hurricane slow intensification continued peaking winds mph minimum barometric pressure mbar inhg september began weakened turning southward downgraded tropical storm october storm curved southeastward east northeastward ahead deep layer trough strong wind shear cold waters left devoid nearly deep convection storm transitioned extratropical cyclone utc october located miles southwest central azores low rapidly moved northeastward degenerated trough low pressure absorbed cold later day tropical storm oscar tropical wave accompanying low pressure area emerged atlantic west coast africa september minimal organization occurred october deep convection developed began organizing utc october system located miles west cape_verde mid level ridge near cape_verde mid upper level low pressure northeast leeward_islands forced depression north northwestward roughly mph consolidation convection near low level center depression upgraded tropical later october strong wind shear began exposing low level center circulation west deep convection oscar continued intensify oscar curved northeastward accelerated october advance approaching cold utc october storm attained peak intensity maximum sustained winds mph minimum barometric pressure mbar inhg hours later satellite data indicated oscar degenerated trough located northwest cape_verde absorbed cold early october tropical storm weak surface trough detached quasi stationary frontal system october located miles north puerto_rico trough approached southern bahamas acquired closed circulation late october developing tropical depression sixteen early following day initially national_hurricane_center predicted intensification citing strong vertical wind shear depression strengthened utc october upgraded tropical storm centered miles east northeast bahamas reached tropical storm status national_hurricane_center noted borrowed time storm predicted eventually unfavorable conditions utc october attained peak intensity maximum sustained winds mph minimum barometric pressure mbar inhg later day increasing vertical wind shear caused storm weaken early october downgraded tropical depression hours trough low pressure hurricane tropical wave emerged atlantic west coast africa october slowly organized moving westward crossed lesser antilles october october system classified tropical storm utc october located miles south southeast initially disorganized wind shear subsequent decrease allowed significant convective activity develop october moving north northwestward following day intensified hurricane cold moving east_coast united_states caused system turn northward eventually northeastward october time peaked maximum sustained winds mph barometric pressure mbar inhg cyclone entered stable atmosphere increasingly cooler seas extratropical late october disorganized tropical cyclone produced flooding northeastern caribbean islands inches rain fell portions lesser antilles causing mudslides landslides river flooding addition heavy rains led significant crop loss near hurricane force winds recorded tropical storm force gusts occurred widespread lightning activity result heavy thunderstorms caused fires power outages fatality occurred woman guadeloupe unsuccessfully attempted drive car flooded roadway passed east bermuda hurricane light rainfall recorded gusts mph left hundreds houses electricity large swells system caused significant damage coastline nova scotia roads washed away obscured debris damage minimal overall reaching million hurricane sandy tropical wave developed tropical depression eighteen utc october located miles south southwest kingston jamaica hours later strengthened tropical storm sandy initially storm headed southwestward curved north northeast mid upper level trough northwestern caribbean_sea gradual increase organization deepening occurred sandy hurricane october hours later landfall near jamaica moderate category hurricane country fatality damage thousands homes resulting million losses clearing jamaica sandy began strengthen significantly utc october struck near cuba winds mph sandy second major hurricane season province homes damaged destroyed lost roofs storm resulted deaths billion damage cuba produced widespread devastation haiti homes flooded damaged destroyed corn beans rice banana coffee crops lost storm left million damage deaths people missing storm weakened slightly crossing cuba emerged southwestern atlantic_ocean category hurricane late october shortly moved central bahamas fatalities million damage reported early october briefly weakened tropical storm acquiring hurricane intensity later day impact limited gusty winds light rainfall rough surf sandy impacted island bermuda tornado parish damaging homes businesses movement processes caused storm storm category hurricane utc october soon weakened category hurricane barometric pressure decreased mbar inhg utc sandy extratropical located offshore new_jersey center extratropical storm moved inland near late october damage severe new_jersey new_york houses damaged destroyed nearly businesses suffered severe losses new_york estimated homes destroyed severe coastal flooding occurred new_york_city hardest hit areas tunnels subway system inundated heavy snowfall reported peaking inches west_virginia additionally remnants sandy left deaths million damage canada ontario quebec worst impacted overall fatalities attributed sandy damages totaled billion united_states billion overall making sandy second atlantic hurricane recorded history hurricane katrina tropical storm tony tropical wave emerged atlantic west coast africa october wave split portion later developing hurricane sandy drifted slowly eastern atlantic portion interacted upper level trough developed surface low pressure area october acquiring deeper convection system tropical depression nineteen utc october depression headed northward eastern periphery low pressure area wind shear strong depression initially failed strengthen nonetheless depression organized intensified tropical storm tony utc october mid level trough northwest ridge east caused storm curve northeastward october tony strengthened utc october attained peak intensity maximum sustained winds mph minimum barometric pressure mbar inhg storm maintained intensity hours moving east northeastward accelerating october tony began weaken combination increasing vertical wind shear decreasing sea surface temperatures later day circulation tony began cooler drier air shear displaced deep convection away center utc october storm declared extratropical took frontal cyclone appearance satellite imagery storm names following names named storms north_atlantic names retired list season list season names oscar sandy tony atlantic storms time replaced keith names william course year retirement april 35th session hurricane committee sandy retired damage deaths caused atlantic hurricane sandy replaced atlantic hurricane season season effects following table lists storms formed atlantic hurricane season includes duration names landfall denoted bold location names damages death totals deaths additional indirect example indirect death traffic accident related storm damage deaths include totals storm extratropical wave low damage figures usd
2012 Atlantic hurricane season