Iselle weakens to tropical storm from hurricane; More than 1,200 people head to shelters. Some 5,000 without power. Hurricane Julio set to reach Hawaii on Monday. The center of Tropical Storm Iselle made landfall on Hawaii's Big Island on Friday, bringing strong winds and heavy rain, knocking down trees and causing power outages ahead of a more powerful storm gathering strength behind it. While Iselle weakened into a tropical storm before reaching the islands, it was being closely followed by Julio, a Category 3 hurricane set to reach the area as early as Sunday morning - although the latest forecasts showed it tracking just north of the archipelago.