The Big Island of Hawaii is under a Hurricane Watch, with the potential for hurricane conditions by early Saturday. Heavy rainfall of up to 25 inches (635 mm) in some areas could lead to life-threatening flooding and mudslides, particularly in steep terrain. Dangerous surf and rip currents are expected, with waves potentially exceeding 30 feet (9 meters). Elevated tides and storm surge may exacerbate coastal flooding. Even areas not directly in the storm's path could experience significant impacts, including rough surf and heavy rain.