<Tr> <Td_colspan="2"> Atlantic hurricane seasons 2015, 2016, 2017, 2018, 2019 </Td> </Tr> <P> The 2017 Atlantic hurricane season is an ongoing event in the annual formation of tropical cyclones in the Atlantic basin . The season has been hyperactive, featuring 17 named storms, tying it with 1936 as the fifth-most active season since records began in 1851 . The season also features both the highest total accumulated cyclone energy (ACE) and the highest number of major hurricanes since the 2005 season . All ten of the season's hurricanes occurred in a row, the greatest number of consecutive hurricanes in the satellite era . In addition, it is the costliest season on record, with a preliminary total of over $316.51 billion (USD) in damages, nearly all of which was due to three of the season's major hurricanes--Harvey, Irma, and Maria . This season is also one of only six years on record to feature multiple Category 5 hurricanes . Irma's landfalls on multiple Caribbean islands and Maria's landfall on Dominica make 2017 the second season on record (after 2007) to feature two hurricanes making landfall at Category 5 intensity . In addition, Irma was the strongest hurricane ever recorded to form in the Atlantic Ocean outside of the Gulf of Mexico and Caribbean Sea . Most tropical cyclones in the Atlantic impacted land but some remained offshore without impacting land, including a tropical depression, Arlene, Don, Gert, Lee, and Rina . This season is the only season on record in which three hurricanes each had an ACE of over 40: Irma, Jose, and Maria . </P> <P> The season officially began on June 1 and will end on November 30 . These dates historically describe the period of year when most tropical cyclones form in the Atlantic basin and are adopted by convention . However, as shown by Tropical Storm Arlene in April, the formation of tropical cyclones is possible at other times of the year . Arlene made 2017 the third consecutive year to feature a pre-season storm . In mid-June, Tropical Storm Bret struck the island of Trinidad, which is only rarely struck by tropical cyclones due to its low latitude . A few days later, Tropical Storm Cindy struck the state of Louisiana . In late August, Hurricane Harvey became the first major hurricane to make landfall in the United States since Wilma in 2005, while also setting the record for the costliest tropical cyclone on record, as well as the most rainfall dropped by a tropical cyclone in the US . In early September, Hurricane Irma, a Cape Verde - type hurricane, became the first Category 5 hurricane to impact the northern Leeward Islands on record, and in terms of maximum sustained winds, is tied with the 1935 Labor Day hurricane as the strongest hurricane ever to make landfall in the Atlantic basin . The season also featured the fastest - moving tropical cyclone ever recorded in the Gulf of Mexico (Nate). The season also featured Ophelia, the easternmost major hurricane in the basin on record, which later impacted most of Northern Europe while extratropical . </P> <P> Initial predictions for the season anticipated that an El Niño would develop, lowering storm activity . However, the predicted El Niño failed to develop, with cool - neutral conditions developing instead, later progressing to a La Niña--the second one in a row . This led to forecasters upgrading their predicted totals, with some later anticipating that the season could be the most active since 2010 . </P>

What are the dates of atlantic hurricane season