The Big Island faces the highest risk, with potential for catastrophic flooding and hurricane-force winds exceeding 75 mph. Maui could see up to 20 inches of rain, while Oahu and Kauai may experience 4 and 3 inches, respectively. The storm's slow movement and interaction with high-pressure systems are expected to exacerbate rainfall and flooding, particularly on the windward and southeastern sides of the islands. Residents in flood-prone areas are at significant risk, and those in higher terrain may experience damaging winds.