The 2005 Atlantic hurricane season was a record-breaking hyperactive season, the most active season in recorded history, and one of the costliest and deadliest seasons of all time. The season began on June 1, 2005, and it ended on November 30, 2005, dates of which conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. The season exceeded these bounds when Arlene formed on May 28 and the last storm dissipated on January 1, becoming one of only two seasons to have a storm cross over to the next year. Overall, the 2005 Atlantic hurricane season produced 32 tropical cyclones, of which 29 developed into tropical storms; 19 storms attained hurricane intensity, and 11 hurricanes further reached major hurricane status, all of these numbers breaking r