This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season. In April 2018, the World Meteorological Organization retired the names Harvey, Irma, Maria, and Nate from its rotating naming lists due to the number of deaths and amount of damage they caused, and they will not be used again for another Atlantic hurricane. Overall, more accumulated cyclone energy was generated during September 2017 than during the entire 2016 season. Four long-lived major hurricanes-Irma, Jose, Lee and Maria-moved through the Atlantic Basin, as did the short-lived Hurricane Katia. September was both the most active month in the season and the most active month for Atlantic hurricanes ever recorded. Of those six, Harvey and Irma, became the first major hurricanes to make landfall on the continental United States in 12 years a third hurricane, Nate, did so as well.
The 2017 season produced 17 named storms, of which 10 became hurricanes including six of which intensified into major hurricanes (Category 3, 4 or 5). The final storm of the season, Tropical Storm Rina degenerated to a remnant area of low pressure on November 9. However, storm formation is possible at any time of the year, as demonstrated in 2017 by the formation of the season's first named storm, Tropical Storm Arlene, on April 19. These dates, adopted by convention, historically describe the period in each year when most tropical systems form. The season officially began on June 1, 2017 and ended on November 30, 2017. This Atlantic hurricane season saw above-normal activity it was the seventh most active season on record and the most active since 2005.
The 2017 Atlantic hurricane season was an event in the annual tropical cyclone season in the north Atlantic Ocean.
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