Hurricane Hector whirled toward Hawaii with 130 miles per hour winds, bringing the threat of risky sea swells on two islands in the USA archipelago state.
Hector is expected to pass within 100 to 150 miles south of the Big Island on Wednesday.
On the five-point Saffir-Simpson scale, a Category Five storm is the most unsafe, with winds exceeding 156 miles per hour (251 kph).
A Tropical Storm Warning means tropical storm conditions are expected somewhere within the warning area. Authorities in the Baja California resort of Los Cabos placed red flags on beaches in expectation of waves up to five metres high, said Carlos Alfredo Godinez Leon, a civil protection official.
Late Friday, Hurricane Hector, swirling in the Pacific some 1,700 miles (2,760 km) east of the Big Island, grew into a "major hurricane", and its maximum sustained winds reached 120 mph (195 km per hour), the US National Hurricane Center said.
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The CPHC noted swells and tropical storm conditions would affect the Big Island today, August 8. Some slight weakening is forecast during the next couple of days.
Surf along east facing shores is building and is expected to peak tonight and into early Wednesday at 12 to 15 feet for the Big Island and 6 to 10 feet for Maui County.
Hawaii County Civil Defense urged residents of the Big Island to follow safety measures, such as securing loose objects, especially boats, and residents living on the oceanfront are told to be on alert for "high and unsafe surf conditions".
"The strongest winds are expected downslope from mountains, across elevated terrain, over headlands and through gaps".
"Hector is expected to pass far enough to the south so that no important wind issues are expected to impact the Big Island", AccuWeather Hurricane Expert Dan Kottlowski said.