Hector was located about 930 miles east-southeast of Hilo, Hawaii, and was moving to the west at 15 mph.
An erupting Hawaii volcano is causing fewer earthquakes, and there's less lava coming out of an eruption site in a neighbourhood just as the Big Island braces for an approaching hurricane. It's not known yet if the island will be impacted.
Under the current forecast track, Hector is expected to pass south of the Big Island of Hawaii late Wednesday or Wednesday night.
The Hawaii Coast Guard has set a port condition of "WHISKEY" due to the impending storm, during which time commercial traffic and transfer operations are allowed to continue.
"On the forecast track, Hector will cross into the central Pacific basin during the next several hours".
On Friday, state officials warned residents and visitors to take precautions in case Hector gets closer to the island chain.
The Center said high surf and rip currents will be the main threat on beaches and some bands of heavier rain would hit the islands.
Hurricane-force winds extend outward up to 30 miles from the center and tropical-storm-force winds extend outward up to 105 miles, the NHC said in its latest advisory.
According to the National Weather Service, the earliest reasonable onset of effects on Hawai'i Island will be sometime on Tuesday night or early Wednesday morning.
After Monday, the storm is forecast to weaken to a Category 2 or 1 hurricane.
CNN meteorologist Haley Brink said it was too early to tell if the hurricane would trigger an eruption of Kilauea. At least 700 homes have been destroyed, authorities estimate, and thousands of people have been displaced.