Hurricane Iwa, taken from the Hawaiian language name for the frigatebird (ʻiwa, lit. "Thief"), was at the time the costliest hurricane to affect the state of Hawaiʻi. Iwa was the twenty-third tropical storm and the twelfth and final hurricane of the 1982 Pacific hurricane season. It developed from an active trough of low pressure near the equator on November 19. The storm moved erratically northward until becoming a hurricane on November 23 when it began accelerating to the northeast in response to strong upper-level flow from the north. Iwa passed within 25 miles of the island of Kauaʻi with peak winds of 90 mph (145 km/h) on November 23 (November 24 Coordinated Universal Time), and the next day it became extratropical to the northeast of the state.