The 2017 Atlantic hurricane season is an ongoing event in the annual formation of tropical cyclones in the Atlantic basin. The season has been very active, featuring five major hurricanes, the highest number since 2010 as well as the most accumulated cyclone energy (ACE) since 2005. In addition, it is potentially the costliest season on record, with a preliminary total of over $186.7 billion (USD) in damages, nearly all of which was due to three of the major hurricanes of the season – Harvey, Irma, and Maria.