Hector also posed no immediate threat to land, but forecasters said people in Hawaii should monitor the storm's progress as it was projected to pass just south of the islands by midweek.
As of 5 p.m. ET, Hector had winds of 130 miles per hour and was moving to the west at 16 miles per hour. However, tropical-storm-force winds and pounding, unsafe surf are possible late Tuesday and Wednesday. The hurricane center said in its 5 p.m. update the "far northern fringes of the hurricane will brush the Big Island on Wednesday".
Surf along the island's east-facing shores is already building and will peak later today and tonight, at 12 to 15 feet for the Big Island mainly in the Puna and Kau districts with 6 to 10 feet surf for eastern Maui. It was located about 470 miles east-southeast of South Point, Hawaii.
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John was expected to strengthen rapidly and become a major hurricane by late Tuesday. It was likely to bring rain to the southern part of peninsula as well as heavy surf.
The tropical Atlantic remains cooler than normal and there is a relatively high potential that a weak El Niño develops in the next several months.
The storm is not now a threat to any land. Hurricane season runs through the end of November.
A tropical storm warning has been posted for the Big Island of Hawaii, where tropical-storm-force winds (39-plus mph) are expected Wednesday, especially downslope from mountains, across elevated terrain, over headlands and through gaps. Debby is the fourth named storm of the 2018 Atlantic hurricane season.