As of the morning of August 9, Hector was moving to the southwest from Hilo to the West at a speed of 20 km per hour. Hurricane-force winds extend about 30 miles (45 kilometers) from Hector's center and tropical storm-force winds can reach up to 90 miles (150 kilometres) from the eye outwards.
A tropical storm warning has been issued for the Big Island as it passes Hawaii as a strong Category 4 storm. No coastal watches are warnings were issued, but forecasters said a tropical storm watch may be issued for Johnston Island.
A tropical storm warning was in place Wednesday for the Big Island with gusty winds, rain and unsafe surf possible.
Maximum sustained winds are near 125 miles per hour (205 kph) with higher gusts.More news: China set to respond to new round of USA tariffs
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Meteorologists canceled a tropical storm warning in Hawaii as Hector moved south of the Big Island late Wednesday.
CPHC said "Swells generated by Hector will likely produce large and risky surf along southeast and east facing shores of the Big Island today".
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. "The strongest winds are expected down the slope of the mountains, across elevated terrain, over headlands, and through gaps".
The National Weather Service Honolulu issued this weather forecast on Tuesday evening: "Hurricane Hector will be passing by south of the Big Island on Wednesday, and will bring an increase in winds and rain to windward and southeastern portions of the Big Island".