Prior to moving across the island of Hawaii, strong thunderstorms developed in the northeastern portion of the remnant circulation of Fefa. The thunderstorms developed further as they moved over the slopes of Mauna Kea and Kohala. The thunderstorms produced heavy rainfall in areas, resulting in flash flooding in Kohala and Hamakua. Hurricane Fefa resulted in no known deaths. Lightning from the storm caused two injuries. A man in Hawaii Volcanoes National Park was hurt when lightning struck where he was walking. A man in Hilo was burnt when lightning moved through telephone wires. The storm resulted in no reported damage.