From Hawaii News:
Kauai County, meanwhile, is under a hurricane watch. The hurricane warning, in effect for the Big Island, Maui County and Oahu, means hurricane conditions are expected within 36 hours, while a hurricane watch is issued when hurricane conditions are possible within 48 hours. On Wednesday night, heavy rains buffeted the Big Island, triggering flooding in some spots and forcing the closure of Bayfront Highway in Hilo and several other roadways. The National Weather Service said rainfall rates of 1 to 3 inches an hour were being recorded in some spots.