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During 2017, tropical cyclones formed within seven different tropical cyclone basins, located within various parts of the Atlantic, Pacific and Indian Oceans. During the year, a total of 146 tropical cyclones had formed. 88 tropical cyclones had been named by either a
Regional Specialized Meteorological Center A Regional Specialized Meteorological Centre (RSMC) is responsible for the distribution of information, advisories, and warnings regarding the specific program they have a part of, agreed by consensus at the World Meteorological Organization as p ...
(RSMC) or a
Tropical Cyclone Warning Center A Regional Specialized Meteorological Centre (RSMC) is responsible for the distribution of information, advisories, and warnings regarding the specific program they have a part of, agreed by consensus at the World Meteorological Organization as p ...
(TCWC). The most active basin in the year was the Western Pacific, which documented 27 named systems. However, the season was a slightly below-average season and the first since 1977 season saw no Category 5-equivalent super typhoon. The
Eastern Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the contine ...
, despite amounting to 18 named systems, also was a was significantly less active than the previous three Pacific hurricane seasons (
2014 File:2014 Events Collage.png, From top left, clockwise: Stocking up supplies and personal protective equipment (PPE) for the Western African Ebola virus epidemic; Citizens examining the ruins after the Chibok schoolgirls kidnapping; Bundles of wa ...
,
2015 File:2015 Events Collage new.png, From top left, clockwise: Civil service in remembrance of November 2015 Paris attacks; Germanwings Flight 9525 was purposely crashed into the French Alps; the rubble of residences in Kathmandu following the April ...
and
2016 File:2016 Events Collage.png, From top left, clockwise: Bombed-out buildings in Ankara following the 2016 Turkish coup d'état attempt; the Impeachment of Dilma Rousseff, impeachment trial of Brazilian President Dilma Rousseff; Damaged houses duri ...
). However, the
North Atlantic hurricane An Atlantic hurricane, also known as tropical storm or simply hurricane, is a tropical cyclone that forms in the Atlantic Ocean, primarily between the months of June and November. A hurricane differs from a cyclone or typhoon only on the basis of ...
featured 17 named storms, and was the costliest tropical cyclone season on record. It also had the fifth-most named storms since reliable records began in
1851 Events January–March * January 11 – Hong Xiuquan officially begins the Taiping Rebellion. * January 15 – Christian Female College, modern-day Columbia College, receives its charter from the Missouri General Assembly. ...
– tied with
1936 Events January–February * January 20 – George V of the United Kingdom and the British Dominions and Emperor of India, dies at his Sandringham Estate. The Prince of Wales succeeds to the throne of the United Kingdom as King E ...
– and the most major hurricanes since
2005 File:2005 Events Collage V2.png, From top left, clockwise: Hurricane Katrina in the Gulf of Mexico; the Funeral of Pope John Paul II is held in Vatican City; " Me at the zoo", the first video ever to be uploaded to YouTube; Eris was discover ...
. The Australian region season experienced the average number of cyclones reaching
tropical storm A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depend ...
intensity, numbering 11, respectively. Activity across the southern hemisphere's three basins— South-West Indian,
Australian Australian(s) may refer to: Australia * Australia, a country * Australians, citizens of the Commonwealth of Australia ** European Australians ** Anglo-Celtic Australians, Australians descended principally from British colonists ** Aboriginal A ...
, and
South Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...
—was spread evenly, with each region recording seven named storms apiece. Three Category 5 tropical cyclones formed during the year. The strongest and deadliest
tropical cyclone A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Dep ...
was
Hurricane Maria Hurricane Maria was a deadly Category 5 hurricane that devastated the northeastern Caribbean in September 2017, particularly Dominica, Saint Croix, and Puerto Rico. It is regarded as the worst natural disaster in recorded history to affect ...
with a minimum
barometric pressure Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as , which is equivalent to 1013.25 millibars, 7 ...
of 908
mbar The bar is a metric unit of pressure, but not part of the International System of Units (SI). It is defined as exactly equal to 100,000  Pa (100 kPa), or slightly less than the current average atmospheric pressure on Earth at sea l ...
(hPa; ) and killing 3,000 people in
Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and unincorporated ...
and
Dominica Dominica ( or ; Kalinago: ; french: Dominique; Dominican Creole French: ), officially the Commonwealth of Dominica, is an island country in the Caribbean. The capital, Roseau, is located on the western side of the island. It is geographical ...
. The costliest tropical cyclone of the year was
Hurricane Harvey Hurricane Harvey was a devastating Category 4 hurricane that made landfall on Texas and Louisiana in August 2017, causing catastrophic flooding and more than 100 deaths. It is tied with 2005's Hurricane Katrina as the costliest ...
in the Atlantic, which struck Houston metropolitan area in August causing US$125 billion in damage, tying with
Hurricane Katrina Hurricane Katrina was a destructive Category 5 Atlantic hurricane that caused over 1,800 fatalities and $125 billion in damage in late August 2005, especially in the city of New Orleans and the surrounding areas. It was at the time the cost ...
as the costliest tropical cyclone worldwide.


Global atmospheric and hydrological conditions

For the majority of the year, the tropics were dominated by neutral El Niño–Southern Oscillation (ENSO) conditions, before La Niña conditions set in later in the year. As the year opened,
sea surface temperatures Sea surface temperature (SST), or ocean surface temperature, is the ocean temperature close to the surface. The exact meaning of ''surface'' varies according to the measurement method used, but it is between and below the sea surface. Air mass ...
anomalies across the central and east-central
equator The equator is a circle of latitude, about in circumference, that divides Earth into the Northern and Southern hemispheres. It is an imaginary line located at 0 degrees latitude, halfway between the North and South poles. The term can also ...
ial Pacific were cooler than average, while the impacts of La Niña lingered within the
atmospheric circulation Atmospheric circulation is the large-scale movement of air and together with ocean circulation is the means by which thermal energy is redistributed on the surface of the Earth. The Earth's atmospheric circulation varies from year to year, bu ...
, following an abrupt end to the 2016 La Niña episode. Over the next few months, these anomalies warmed and nearly reached the thresholds needed for an El Niño event to be declared, however, they subsequently cooled throughout the rest of the year and the 2017–18 La Niña event was declared to be underway. Scientists pointed out that the increase of emissions contributes to warmer ocean waters and more moist air for rain. Because of
sea level rise Globally, sea levels are rising due to human-caused climate change. Between 1901 and 2018, the globally averaged sea level rose by , or 1–2 mm per year on average.IPCC, 2019Summary for Policymakers InIPCC Special Report on the Ocean and Cr ...
it is assumed that the storm surge of
Hurricane Irma Hurricane Irma was an extremely powerful Cape Verde hurricane that caused widespread destruction across its path in September 2017. Irma was the first Category 5 hurricane to strike the Leeward Islands on record, followed by Maria two ...
and other storms will cause greater flooding to vulnerable areas. Data collected by NASA showed that ocean surface temperatures in the path of Irma were above 30 °C (86 °F), capable of sustaining a
Category 5 hurricane Category, plural categories, may refer to: Philosophy and general uses *Categorization, categories in cognitive science, information science and generally *Category of being * ''Categories'' (Aristotle) *Category (Kant) *Categories (Peirce) *C ...
. Prior to affecting the U.S. mainland,
Miami Miami ( ), officially the City of Miami, known as "the 305", "The Magic City", and "Gateway to the Americas", is a coastal metropolis and the county seat of Miami-Dade County in South Florida, United States. With a population of 442,241 at ...
's mayor Tomás Regalado noted on Hurricane Irma, "This is the time to talk about climate change. This is the time that the president and the
EPA The Environmental Protection Agency (EPA) is an independent executive agency of the United States federal government tasked with environmental protection matters. President Richard Nixon proposed the establishment of EPA on July 9, 1970; it be ...
and whoever makes decisions needs to talk about climate change." A day later the head of the EPA,
Scott Pruitt Edward Scott Pruitt (born May 9, 1968) is an American lawyer, lobbyist and Republican politician from the state of Oklahoma. He served as the fourteenth Administrator of the Environmental Protection Agency (EPA) from February 17, 2017, to Jul ...
said, "..to discuss the cause and effect of these storms, there's the… place (and time) to do that, it's not now." Following Irma's landfall,
Donald Trump Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who served as the 45th president of the United States from 2017 to 2021. Trump graduated from the Wharton School of the University of P ...
was asked about the connection between hurricanes and climate change, and stated that "We’ve had bigger storms than this."
Richard Branson Sir Richard Charles Nicholas Branson (born 18 July 1950) is a British billionaire, entrepreneur, and business magnate. In the 1970s he founded the Virgin Group, which today controls more than 400 companies in various fields. Branson expressed ...
who was directly impacted by hurricane Irma noted, "..hurricanes are the start of things to come. Look, climate change is real. Ninety-nine per cent of scientists know it's real. The whole world knows it's real except for maybe one person in the White House."
United Nations The United Nations (UN) is an intergovernmental organization whose stated purposes are to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and be a centre for harmoni ...
secretary general
António Guterres António Manuel de Oliveira Guterres ( , ; born 30 April 1949) is a Portuguese politician and diplomat. Since 2017, he has served as secretary-general of the United Nations, the ninth person to hold this title. A member of the Portuguese Soci ...
citing the devastation from hurricanes noted in September, "The catastrophic Atlantic hurricane season has been made worse by climate change. Cutting carbon emissions must clearly be part of our response to the disaster. The rise in the surface temperature of the ocean has had an impact on weather patterns and we must do everything possible to bring it down." The
Associated Press The Associated Press (AP) is an American non-profit news agency headquartered in New York City. Founded in 1846, it operates as a cooperative, unincorporated association. It produces news reports that are distributed to its members, U.S. new ...
looked at the yearly average
accumulated cyclone energy Accumulated cyclone energy (ACE) is a metric used by various agencies to express the energy released by a tropical cyclone during its lifetime. It is calculating by summing the square of a tropical cyclone's maximum sustained winds, measured ever ...
(ACE), which accounts for wind speed and storm duration to assess hurricane power of the past 30 years and found it to be 41 percent higher than the previous 30 years. They asked several experts about their opinion, James Kossin from
NOAA The National Oceanic and Atmospheric Administration (abbreviated as NOAA ) is an United States scientific and regulatory agency within the United States Department of Commerce that forecasts weather, monitors oceanic and atmospheric conditio ...
"There's no question that the storms are stronger than they were 30 years ago." Climate scientist Stefan Rahmstorf of the
Potsdam Institute for Climate Impact Research The Potsdam Institute for Climate Impact Research (PIK, German: ''Potsdam-Institut für Klimafolgenforschung'') is a German government-funded research institute addressing crucial scientific questions in the fields of global change, climate imp ...
, "The only caveat being that the increase might be exaggerated somewhat because of undercounting early storms." Meteorologist Philip Klotzbach noted, "What's happening with hurricanes — the frequency, the duration, and the energy — is probably a combination of factors caused by both nature and man, a mish-mosh of everything." Kerry Emanuel who studies hurricanes, told the BBC, "The warming of the climate has increased the underlying probabilities of very heavy rain events like happened in Harvey and very high category hurricanes like Irma. It is just not sensible to say either storm was caused by climate change, but the underlying probabilities are going up."


Summary

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Debbie Debbie (or Debby or Deb) is a feminine given name, commonly but not always short for Deborah (or Debra and related variants). Notable people *Debbie Allen, American actress, choreographer and film director * Debbie Armstrong, American athlete * ...
" from:23/03/2017 till:26/03/2017 color:AUSR text:"25U" from:02/04/2017 till:20/04/2017 color:SPAC text:"19F" from:05/04/2017 till:10/04/2017 color:AUSR text:"
Ernie Ernie is a masculine given name, frequently a short form (hypocorism) of Ernest, Ernald, Ernesto, or Verner. It may refer to: People * Ernie Accorsi (born 1941), American football executive * Ernie Adams (disambiguation) * Ernie Afaganis (born c ...
" from:06/04/2017 till:11/04/2017 color:SPAC text:"
Cook Cook or The Cook may refer to: Food preparation * Cooking, the preparation of food * Cook (domestic worker), a household staff member who prepares food * Cook (professional), an individual who prepares food for consumption in the food industry * ...
" from:06/04/2017 till:16/04/2017 color:AUSR text:"27U" from:13/04/2017 till:20/04/2017 color:WPAC text:"Crising" from:15/04/2017 till:17/04/2017 color:NIO text:" Maarutha" from:19/04/2017 till:21/04/2017 color:NATL text:"Arlene" from:21/04/2017 till:01/05/2017 color:AUSR text:"Frances" from:22/04/2017 till:29/04/2017 color:WPAC text:"Muifa" from:29/04/2017 till:03/05/2017 color:AUSR text:"Greg" from:01/05/2017 till:10/05/2017 color:SPAC text:"
Donna Donna may refer to the short form of the honorific ''nobildonna'', the female form of Don (honorific) in Italian. People *Donna (given name); includes name origin and list of people and characters with the name * Roberto Di Donna (born 1968), Ita ...
" from:07/05/2017 till:14/05/2017 color:SPAC text:"Ella" from:09/05/2017 till:10/05/2017 color:EPAC/CPAC text:"Adrian" from:28/05/2017 till:31/05/2017 color:NIO text:" Mora" from:31/05/2017 till:02/06/2017 color:EPAC/CPAC text:" Beatriz" from:31/05/2017 till:02/06/2017 color:SWIO text:"31U" from:10/06/2017 till:13/06/2017 color:WPAC text:"Merbok" from:11/06/2017 till:13/06/2017 color:EPAC/CPAC text:"Calvin" barset:break from:11/06/2017 till:13/06/2017 color:NIO text:" BOB 03" from:19/06/2017 till:20/06/2017 color:NATL text:" Bret" from:20/06/2017 till:23/06/2017 color:NATL text:" Cindy" from:24/06/2017 till:28/06/2017 color:EPAC/CPAC text:"Dora" from:29/06/2017 till:01/07/2017 color:WPAC text:"TD" from:01/07/2017 till:04/07/2017 color:WPAC text:" Nanmadol" from:04/07/2017 till:07/07/2017 color:WPAC text:"TD" from:05/07/2017 till:07/07/2017 color:NATL text:"Four" from:07/07/2017 till:12/07/2017 color:EPAC/CPAC text:"Eugene" from:12/07/2017 till:22/07/2017 color:EPAC/CPAC text:"Fernanda" from:13/07/2017 till:16/07/2017 color:WPAC text:"TD" from:14/07/2017 till:17/07/2017 color:WPAC text:" Talas" from:17/07/2017 till:18/07/2017 color:NATL text:"Don" from:17/07/2017 till:20/07/2017 color:EPAC/CPAC text:"Eight-E" from:17/07/2017 till:26/07/2017 color:EPAC/CPAC text:"Greg" from:18/07/2017 till:19/07/2017 color:NIO text:"BOB 04" from:19/07/2017 till:08/08/2017 color:WPAC text:" Noru" from:20/07/2017 till:28/07/2017 color:WPAC text:"Kulap" from:21/07/2017 till:31/07/2017 color:EPAC/CPAC text:"Hilary" from:21/07/2017 till:29/07/2017 color:WPAC text:" Sonca" barset:break from:21/07/2017 till:23/07/2017 color:WPAC text:"Roke" from:22/07/2017 till:01/08/2017 color:EPAC/CPAC text:"Irwin" from:25/07/2017 till:30/07/2017 color:WPAC text:" Nesat" from:25/07/2017 till:29/07/2017 color:WPAC text:"TD" from:26/07/2017 till:27/07/2017 color:NIO text:" LAND 01" from:27/07/2017 till:02/08/2017 color:WPAC text:"Haitang" from:30/07/2017 till:01/08/2017 color:NATL text:"
Emily Emily may refer to: * Emily (given name), including a list of people with the name Music * "Emily" (1964 song), title song by Johnny Mandel and Johnny Mercer to the film ''The Americanization of Emily'' * "Emily" (Dave Koz song), a 1990 song ...
" from:31/07/2017 till:05/08/2017 color:WPAC text:"Nalgae" from:04/08/2017 till:05/08/2017 color:EPAC/CPAC text:"Eleven-E" from:07/08/2017 till:10/08/2017 color:NATL text:" Franklin" from:08/08/2017 till:08/08/2017 color:AUSR barset:break barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip from:08/08/2017 till:09/08/2017 color:SWIO text:"01U" from:10/08/2017 till:17/08/2017 color:WPAC text:"Banyan" from:11/08/2017 till:13/08/2017 color:EPAC/CPAC text:"Jova" from:13/08/2017 till:17/08/2017 color:NATL text:"
Gert Gert is a mainly masculine given name ( short form of Gerrit, Gerard, etc.) with some female bearers (short for Gertrude). Since 1993 no one in Sweden has been baptised as Gert according to the Swedish Bureau of Census, so the name is becomin ...
" from:17/08/2017 till:20/08/2017 color:NATL barset:break barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip from:23/08/2017 till:01/09/2017 color:NATL text:" Harvey" from:18/08/2017 till:23/08/2017 color:EPAC/CPAC text:"Kenneth" from:19/08/2017 till:24/08/2017 color:WPAC text:" Hato" from:24/08/2017 till:28/08/2017 color:WPAC text:" Pakhar" from:25/08/2017 till:26/08/2017 color:WPAC text:"TD" from:26/08/2017 till:03/09/2017 color:WPAC text:"Sanvu" barset:break from:28/08/2017 till:29/08/2017 color:WPAC text:"TD" from:30/08/2017 till:12/09/2017 color:NATL text:" Irma" from:30/08/2017 till:04/09/2017 color:WPAC text:"Mawar" from:31/08/2017 till:03/09/2017 color:EPAC/CPAC text:" Lidia" from:03/09/2017 till:07/09/2017 color:WPAC text:"Guchol" from:05/09/2017 till:22/09/2017 color:NATL text:"
Jose Jose is the English transliteration of the Hebrew and Aramaic name ''Yose'', which is etymologically linked to ''Yosef'' or Joseph. The name was popular during the Mishnaic and Talmudic periods. *Jose ben Abin *Jose ben Akabya * Jose the Galilea ...
" from:05/09/2017 till:09/09/2017 color:NATL text:"
Katia Katia is a feminine given name. It is a variant of Katya. Notable people with this name Actresses and models * Katia Dandoulaki, Greek actress * Katia Margaritoglou, Greek fashion model and beauty contestant *Katia Winter (born 1983), Swed ...
" from:08/09/2017 till:17/09/2017 color:WPAC text:" Talim" from:10/09/2017 till:16/09/2017 color:WPAC text:" Doksuri" from:11/09/2017 till:19/09/2017 color:EPAC/CPAC text:"Otis" from:13/09/2017 till:15/09/2017 color:EPAC/CPAC text:" Max" from:14/09/2017 till:20/09/2017 color:NATL barset:break barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip barset:skip from:22/09/2017 till:30/09/2017 color:NATL text:"Lee" from:14/09/2017 till:20/09/2017 color:EPAC/CPAC text:"Norma" from:16/09/2017 till:30/09/2017 color:NATL text:" Maria" from:23/09/2017 till:25/09/2017 color:EPAC/CPAC text:"Pilar" from:23/09/2017 till:25/09/2017 color:WPAC text:"Nando" from:03/10/2017 till:04/10/2017 color:EPAC/CPAC text:"Ramon" from:04/10/2017 till:08/10/2017 color:NATL text:" Nate" from:07/10/2017 till:10/10/2017 color:WPAC text:" 23W" from:08/10/2017 till:10/10/2017 color:NIO text:"LAND 02" barset:break from:09/10/2017 till:15/10/2017 color:NATL text:"
Ophelia Ophelia () is a character in William Shakespeare's drama '' Hamlet'' (1599–1601). She is a young noblewoman of Denmark, the daughter of Polonius, sister of Laertes and potential wife of Prince Hamlet, who, due to Hamlet's actions, ends u ...
" from:11/10/2017 till:16/10/2017 color:WPAC text:"Khanun" from:15/10/2017 till:23/10/2017 color:WPAC text:"
Lan Lan or LAN may also refer to: Science and technology * Local asymptotic normality, a fundamental property of regular models in statistics * Longitude of the ascending node, one of the orbital elements used to specify the orbit of an object in spa ...
" from:18/10/2017 till:19/10/2017 color:WPAC text:"26W" from:18/10/2017 till:22/10/2017 color:NIO text:"BOB 05" from:22/10/2017 till:29/10/2017 color:WPAC text:"Saola" from:27/10/2017 till:28/10/2017 color:EPAC/CPAC text:" Selma" from:28/10/2017 till:29/10/2017 color:NATL text:"Philippe" from:30/10/2017 till:08/11/2017 color:WPAC text:"29W" from:31/10/2017 till:04/11/2017 color:WPAC text:" Damrey" from:05/11/2017 till:09/11/2017 color:NATL text:"Rina" from:07/11/2017 till:13/11/2017 color:WPAC text:" Haikui" from:15/11/2017 till:17/11/2017 color:NIO text:"BOB 06" from:16/11/2017 till:19/11/2017 color:WPAC text:"Kirogi" from:16/11/2017 till:19/11/2017 color:MED text:"
Numa Nuclear mitotic apparatus protein 1 is a protein that in humans is encoded by the ''NUMA1'' gene. Interactions Nuclear mitotic apparatus protein 1 has been shown to interact with PIM1, Band 4.1, GPSM2 G-protein-signaling modulator 2, also ca ...
" from:21/11/2017 till:29/11/2017 color:AUSR text:" Cempaka" from:26/11/2017 till:04/12/2017 color:AUSR text:"Dahlia" from:26/11/2017 till:29/11/2017 color:AUSR text:"04U" from:29/11/2017 till:06/12/2017 color:NIO text:" Ockhi" from:01/12/2017 till:02/12/2017 color:AUSR text:"05U" barset:break from:05/12/2017 till:09/12/2017 color:NIO text:"BOB 08" from:09/12/2017 till:11/12/2017 color:SATL text:"Guará" from:13/12/2017 till:23/12/2017 color:WPAC text:" Kai-tak" from:16/12/2017 till:18/12/2017 color:SPAC text:"02F" from:17/12/2017 till:19/12/2017 color:SPAC text:"03F" from:20/12/2017 till:26/12/2017 color:WPAC text:" Tembin" from:20/12/2017 till:26/12/2017 color:SPAC text:"04F" from:26/12/2017 till:29/12/2017 color:AUSR text:"Hilda" from:27/12/2017 till:09/01/2018 color:SWIO text:" Ava" from:29/12/2017 till:04/01/2018 color:WPAC text:" Bolaven" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:20/12/2016 till:01/01/2017 text:Dec. '16 from:01/01/2017 till:01/02/2017 text:January from:01/02/2017 till:28/02/2017 text:February from:01/03/2017 till:01/04/2017 text:March from:01/04/2017 till:01/05/2017 text:April from:01/05/2017 till:01/06/2017 text:May from:01/06/2017 till:01/07/2017 text:June from:01/07/2017 till:01/08/2017 text:July from:01/08/2017 till:01/09/2017 text:August from:01/09/2017 till:01/10/2017 text:September from:01/10/2017 till:01/11/2017 text:October from:01/11/2017 till:01/12/2017 text:November from:01/12/2017 till:01/01/2018 text:December from:01/01/2018 till:10/01/2018 text:Jan. '18 TextData = pos:(620,30) text:"This table is based on the" pos:(741,30) text:" tropical cyclone basins"


North Atlantic Ocean

The Atlantic basin was hyperactive with 17 named storms, 10 consecutive hurricanes, and 6 major hurricanes. It was also the second consecutive above-average season since 2016 and the costliest season on record. Most of the damage was caused by hurricanes Harvey, Irma, and Maria. Hurricane Nate was considered the worst natural disaster in
Costa Rican Costa Rica (, ; ; literally "Rich Coast"), officially the Republic of Costa Rica ( es, República de Costa Rica), is a country in the Central American region of North America, bordered by Nicaragua to the north, the Caribbean Sea to the ...
history. Due to the damage that the four hurricanes made, the names ''Harvey'', ''Irma'', ''Maria'', and ''Nate'' were retired by the
WMO The World Meteorological Organization (WMO) is a specialized agency of the United Nations responsible for promoting international cooperation on atmospheric science, climatology, hydrology and geophysics. The WMO originated from the Internatio ...
after the season. The first named storm, Arlene, formed on April 19 as a subtropical depression. When Arlene was named on April 20, it became only the second named storm to form in April, the other being Ana in 2003 and the strongest tropical cyclone on record in April. No storms formed in May. Throughout June and July, activity increased with Tropical Storms Bret, Cindy, Don, and Emily and Tropical Depression Four. However, most storms were weak or short-lived and resulted in the lowest ACE for the first five named storms on record, surpassing 1988. In August, Hurricanes Franklin, Gert, Harvey, and Irma formed with the latter two causing catastrophic damage to the contiguous United States. Hurricane Harvey caused catastrophic flooding and was tied the costliest hurricane on record along with
Hurricane Katrina Hurricane Katrina was a destructive Category 5 Atlantic hurricane that caused over 1,800 fatalities and $125 billion in damage in late August 2005, especially in the city of New Orleans and the surrounding areas. It was at the time the cost ...
in 2005. Hurricane Irma caused a trail of damage from the
Leeward Islands french: Îles-Sous-le-Vent , image_name = , image_caption = ''Political'' Leeward Islands. Clockwise: Antigua and Barbuda, Guadeloupe, Saint kitts and Nevis. , image_alt = , locator_map = , location = Caribbean Sea North Atlantic Ocean , co ...
to
Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and ...
, causing $77.2 billion in damage, and became the first Category 5 hurricane to make landfall in the Leeward Islands. In September, copious activity occurred with Hurricanes Jose, Katia, Lee, and Maria, with the latter becoming the tenth most intense hurricane on record. Hurricane Maria caused catastrophic damage to
Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and unincorporated ...
and
Dominica Dominica ( or ; Kalinago: ; french: Dominique; Dominican Creole French: ), officially the Commonwealth of Dominica, is an island country in the Caribbean. The capital, Roseau, is located on the western side of the island. It is geographical ...
with over 3,000 fatalities and $91.606 billion in damage.
Accumulated cyclone energy Accumulated cyclone energy (ACE) is a metric used by various agencies to express the energy released by a tropical cyclone during its lifetime. It is calculating by summing the square of a tropical cyclone's maximum sustained winds, measured ever ...
also increased rapidly during this month, resulting in three hurricanes achieving an ACE over 40, the first on record to do so, September 8th becoming the most active day on record based on ACE, and Hurricane Irma achieving the third-highest ACE on record with 64.9 units. By October, activity still persisted although the potential for a La Niña would begin peaking by November. Hurricane Nate became the worst natural disaster in Costa Rican history as a precursor, while Ophelia became the worst tropical cyclone to affect
Ireland Ireland ( ; ga, Éire ; Ulster-Scots: ) is an island in the North Atlantic Ocean, in north-western Europe. It is separated from Great Britain to its east by the North Channel, the Irish Sea, and St George's Channel. Ireland is the s ...
in 50 years. Philippe was a short-lived system that contributed to a
bomb cyclone A bomb is an explosive weapon that uses the exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy. Detonations inflict damage principally through ground- and atmosphere-transmitted mechanica ...
shortly after its dissipation. Finally, Tropical Storm Rina became the last storm to form in this basin, dissipating on November 9th. The extratropical remnants of this system later contributed to
Cyclone Numa Cyclone Numa, also known as Medicane Numa, was a Mediterranean tropical-like cyclone with the properties of a subtropical cyclone. Numa formed on 11 November 2017 west of the British Isles, out of the extratropical remnants of Tropical Storm ...
(or Storm Zenon), which affected
Greece Greece,, or , romanized: ', officially the Hellenic Republic, is a country in Southeast Europe. It is situated on the southern tip of the Balkans, and is located at the crossroads of Europe, Asia, and Africa. Greece shares land borders wi ...
,
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...
,
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
,
Tunisia ) , image_map = Tunisia location (orthographic projection).svg , map_caption = Location of Tunisia in northern Africa , image_map2 = , capital = Tunis , largest_city = capital , ...
, and
Turkey Turkey ( tr, Türkiye ), officially the Republic of Türkiye ( tr, Türkiye Cumhuriyeti, links=no ), is a transcontinental country located mainly on the Anatolian Peninsula in Western Asia, with a small portion on the Balkan Peninsula ...
and caused the worst weather event in Greece since 1977. The season ended on November 30th.


Eastern & Central Pacific Oceans

The 2017 Pacific hurricane season was a moderately active season with eighteen named storms, nine hurricanes, and four major hurricanes. Unlike the three previous hyperactive seasons (
2014 File:2014 Events Collage.png, From top left, clockwise: Stocking up supplies and personal protective equipment (PPE) for the Western African Ebola virus epidemic; Citizens examining the ruins after the Chibok schoolgirls kidnapping; Bundles of wa ...
,
2015 File:2015 Events Collage new.png, From top left, clockwise: Civil service in remembrance of November 2015 Paris attacks; Germanwings Flight 9525 was purposely crashed into the French Alps; the rubble of residences in Kathmandu following the April ...
, and
2016 File:2016 Events Collage.png, From top left, clockwise: Bombed-out buildings in Ankara following the 2016 Turkish coup d'état attempt; the Impeachment of Dilma Rousseff, impeachment trial of Brazilian President Dilma Rousseff; Damaged houses duri ...
), the season was significantly less active in terms of ACE and most storms that existed through this basin were either weak or short-lived. Early May saw the formation of Tropical Storm Adrian, which was the earliest named tropical cyclone to exist east of 140°W at the time; it was surpassed by Tropical Storm Andres in 2021. Throughout June and July, the basin saw some considerable activity, with the latter month having the fifth-highest ACE in the Eastern Pacific. Storms that existed during this time include Hurricanes Dora, Eugene, Fernanda, Hilary, Irwin, Tropical Storms Beatriz, Calvin, and Greg, and Tropical Depression Eight-E, which contributed to the ACE count throughout the earlier parts of the season. Throughout August and September, activity decreased significantly, but stagnated in terms of named storms with some being short-lived. For example, in September, only four named storms formed (Otis, Max, Norma and Pilar) and October featured tropical storms Ramon and Selma, in which none attained hurricane status. Selma became the first named storm to make landfall in El Salvador and also contributed to the formation of Philippe in the Atlantic. No storms have formed in November since 2010. In the Central Pacific, no storms have formed since 2011. The season began on June 1st and both seasons ended on November 30th, 2017.


Western Pacific Ocean


North Indian Ocean


Systems


January

In January 2017, 12 storms formed. Tropical 14U, the strongest system this January 2017, affected the Northern Territory and the Western Australia. Surprisingly, 01W (Auring) formed in January 7 on the West Pacific and lasted until the 16th.


February

In February, 16 systems formed. Cyclone Dineo, one of the deadliest tropical cyclones on record in the South-West Indian Ocean and Southern Hemisphere, hit Mozambique and lasted from 13 February to 17th of the same month. On the West Pacific, Bising formed and lasted from 3rd – 7th of this month.


March

On March, 11 storms formed.
Cyclone Enawo Intense Tropical Cyclone Enawo was the strongest tropical cyclone of the 2016–17 South-West Indian Ocean cyclone season. Enawo was the strongest tropical cyclone to strike Madagascar since Gafilo in 2004, killing 78 people and causing $400 ...
, was the strongest cyclone to strike
Madagascar Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Afric ...
since Gafilo in 2004.


April

10 storms formed on April. One notable storm is Cyclone Ernie on Australian Region, is one of the quickest strengthening tropical cyclone on modern record. Crising also formed and affected
Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...
in its lifespan.


May

5 systems formed on May. Tropical Storm Adrian, the earliest-known formation of a named storm in eastern Pacific proper, formed on May 9 and lasted until 10th of this month. Cyclone Donna also formed, which is the strongest Off-season South Pacific Cyclone on the month of May.


June

7 systems formed on this month. On this list is
Tropical Storm Bret The name Bret has been used for seven tropical cyclones in the Atlantic Ocean. * Tropical Storm Bret (1981), made landfall in southern Maryland, no real damage * Tropical Storm Bret (1987), short-lived storm, remained in the eastern Atlantic Ocean ...
, a tropical storm from a low-latitude tropical wave that affected
Trinidad and Tobago Trinidad and Tobago (, ), officially the Republic of Trinidad and Tobago, is the southernmost island country in the Caribbean. Consisting of the main islands Trinidad and Tobago, and numerous much smaller islands, it is situated south of ...
,
Guyana Guyana ( or ), officially the Cooperative Republic of Guyana, is a country on the northern mainland of South America. Guyana is an indigenous word which means "Land of Many Waters". The capital city is Georgetown. Guyana is bordered by the ...
,
Venezuela Venezuela (; ), officially the Bolivarian Republic of Venezuela ( es, link=no, República Bolivariana de Venezuela), is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in th ...
, and
Windward Islands french: Îles du Vent , image_name = , image_caption = ''Political'' Windward Islands. Clockwise: Dominica, Martinique, Saint Lucia, Saint Vincent and the Grenadines, and Grenada. , image_alt = , locator_map = , location = Caribbean Sea No ...
., and Hurricane Dora (2017), that affected Southwestern Mexico. Also included is Severe Tropical Merbok from
Western Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...
.


July

23 systems formed on the month of July, making it the busiest month of this year. On the West Pacific, Tropical Storm Nanmadol, Tropical Storm Talas,
Typhoon Noru Typhoon Noru, known in the Philippines as Super Typhoon Karding, was an intense tropical cyclone that affected Vietnam, Thailand, and the Philippines — where it caused widespread agricultural damage. The sixteenth named storm and eighth ...
, Tropical Storm Kulap, Tropical Storm Sonca, Tropical Storm Roke (Fabian), Typhoon Nesat, Tropical Storm Haitang (Huaning) and Tropical Storm Nalgae formed. On the East Pacific, Hurricanes Eugene, Fernanda, Hilary and Irwin., a depression and Tropical Storm Greg formed. On the Atlantic, Tropical Storm Don, Tropical Storm Emily, and a weak depression formed. On the North Indian Ocean, two depressions formed.


August

15 storms formed in August 2017. Typhoon Banyan,
Typhoon Hato Typhoon Hato, known in the Philippines as Severe Tropical Storm Isang, was a strong tropical cyclone that struck South China in August 2017. Developing as the thirteenth named storm and the fourth typhoon of the Pacific typhoon season, Hato for ...
, Tropical Storm Pakhar, Typhoon Sanvu, and Severe Tropical Storm Mawar formed on the West Pacific. On the Atlantic, Hurricane Franklin,
Hurricane Gert Hurricane Gert was a large tropical cyclone that caused extensive flooding and mudslides throughout Central America and Mexico in September 1993. The seventh named storm and third hurricane of the annual hurricane season, Gert originated a ...
,
Hurricane Harvey Hurricane Harvey was a devastating Category 4 hurricane that made landfall on Texas and Louisiana in August 2017, causing catastrophic flooding and more than 100 deaths. It is tied with 2005's Hurricane Katrina as the costliest ...
, and
Hurricane Irma Hurricane Irma was an extremely powerful Cape Verde hurricane that caused widespread destruction across its path in September 2017. Irma was the first Category 5 hurricane to strike the Leeward Islands on record, followed by Maria two ...
formed. On the East Pacific, a weak depression, Tropical Storm Jova, Hurricane Kenneth and another tropical storm, Tropical Storm Lidia formed.


September

12 cyclones existed in September 2017. In the Western Pacific, Typhoons Talim and Doksuri, as well as Tropical Storm Guchol and Tropical Depression 22W (Nando) formed. In the Eastern Pacific, Hurricanes Otis, Max, Norma, and Tropical Storm Pilar existed during September. The strongest cyclone of September was
Hurricane Maria Hurricane Maria was a deadly Category 5 hurricane that devastated the northeastern Caribbean in September 2017, particularly Dominica, Saint Croix, and Puerto Rico. It is regarded as the worst natural disaster in recorded history to affect ...
, which was the second Category 5 hurricane to make landfall in the Atlantic in 2017. Hurricanes
Jose Jose is the English transliteration of the Hebrew and Aramaic name ''Yose'', which is etymologically linked to ''Yosef'' or Joseph. The name was popular during the Mishnaic and Talmudic periods. *Jose ben Abin *Jose ben Akabya * Jose the Galilea ...
,
Katia Katia is a feminine given name. It is a variant of Katya. Notable people with this name Actresses and models * Katia Dandoulaki, Greek actress * Katia Margaritoglou, Greek fashion model and beauty contestant *Katia Winter (born 1983), Swed ...
, and Lee also existed in the Atlantic.


October

14 cyclones existed in October 2017. The strongest tropical cyclone in this month was
Typhoon Lan Typhoon Lan, known in the Philippines as Typhoon Paolo, was the third-most intense tropical cyclone worldwide in 2017. A very large storm, Lan was the twenty-first tropical storm and ninth typhoon of the annual typhoon season. It originated from ...
, which was the third most intense tropical cyclone based on central pressure. Along with Lan, Tropical Depression 23W, Tropical Depressions 26W and 29W, Tropical Storm Saola, Typhoons Khanun, and Damrey existed in the Western Pacific. In the Atlantic, Hurricanes Nate,
Ophelia Ophelia () is a character in William Shakespeare's drama '' Hamlet'' (1599–1601). She is a young noblewoman of Denmark, the daughter of Polonius, sister of Laertes and potential wife of Prince Hamlet, who, due to Hamlet's actions, ends u ...
, as well as Tropical Storm Philippe existed during the month. In the Eastern Pacific, Tropical Storms Ramon and Selma formed during the month. In the North Indian Ocean, Land Depression 02 and Depression BOB 05 formed during the month.


November


December


Global effects


See also

*
Weather of 2017 The following is a list of weather events that occurred in 2017. Summary by weather type Winter storms and cold waves Winter weather in 2017 kicked off January 4–8, 2017 North American winter storm, with a winter storm from January 4-8. Th ...
* Tropical cyclones by year * List of earthquakes in 2017 *
Tornadoes of 2017 This page documents notable tornadoes and tornado outbreaks worldwide in 2017. Strong and destructive tornadoes form most frequently in the United States, Brazil, Bangladesh, and East India, Eastern India, but they can occur almost anywhere under ...
* 2017 wildfire season


Notes

1 Only systems that formed either on or after January 1, 2017 are counted in the seasonal totals.
2 Only systems that formed either before or on December 31, 2017 are counted in the seasonal totals.
3 The wind speeds for this tropical cyclone are based on the IMD Scale which uses 3-minute sustained winds.
4 The wind speeds for this tropical cyclone are based on the Saffir Simpson Scale which uses 1-minute sustained winds.


References


External links

Regional Specialized Meteorological Centers
US National Hurricane Center
nbsp;– North Atlantic, Eastern Pacific
Central Pacific Hurricane Center
nbsp;– Central Pacific
Japan Meteorological Agency
nbsp;– NW Pacific
India Meteorological Department
nbsp;–
Bay of Bengal The Bay of Bengal is the northeastern part of the Indian Ocean, bounded on the west and northwest by India, on the north by Bangladesh, and on the east by Myanmar and the Andaman and Nicobar Islands of India. Its southern limit is a line bet ...
and the
Arabian Sea The Arabian Sea ( ar, اَلْبَحرْ ٱلْعَرَبِيُّ, Al-Bahr al-ˁArabī) is a region of the northern Indian Ocean bounded on the north by Pakistan, Iran and the Gulf of Oman, on the west by the Gulf of Aden, Guardafui Channe ...

Météo-France – La Reunion
nbsp;– South Indian Ocean from 30°E to 90°E
Fiji Meteorological Service
nbsp;– South Pacific west of 160°E, north of 25° S Tropical Cyclone Warning Centers
Meteorology, Climatology, and Geophysical Agency of Indonesia
nbsp;– South Indian Ocean from 90°E to 141°E, generally north of 10°S
Australian Bureau of Meteorology (TCWC's Perth, Darwin & Brisbane)
nbsp;– South Indian Ocean & South Pacific Ocean from 90°E to 160°E, generally south of 10°S
Papua New Guinea National Weather Service
nbsp;– South Pacific Ocean from 141°E to 160°E, generally north of 10°S
Meteorological Service of New Zealand Limited
nbsp;– South Pacific west of 160°E, south of 25°S {{DEFAULTSORT:Tropical cyclones in 2017 * Tropical cyclones by year 2017 Atlantic hurricane season 2017 Pacific hurricane season 2017 Pacific typhoon season 2017 North Indian Ocean cyclone season 2016–17 Australian region cyclone season 2017–18 Australian region cyclone season 2016–17 South Pacific cyclone season 2017–18 South Pacific cyclone season 2016–17 South-West Indian Ocean cyclone season 2017–18 South-West Indian Ocean cyclone season