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 kilometers) from the eye.
Hurricane Hector remains a category four storm as it slowly moves west towards the south of Hawaii.
A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area. But the U.S. National Hurricane Center says Ileana now is predicted to remain a tropical storm before dissipating by late Tuesday due to the influence of the larger John. Debby poses no threat to land, the hurricane center said.
Hawaii's Big Island will begin feeling gusty winds and rain Tuesday as Hurricane Hector approaches.
The forecast, released last week, said the tropical Atlantic was anomalously cool and strong wind shear has been recorded over the Caribbean in the last month.
John was located about 320 miles (510 km) southwest of Cabo Corrientes, Mexico, and 435 miles (700 km) south of the southern tip of Baja California as of 0300 GMT. A subtropical storm is a hybrid of a tropical and non-tropical system.
Hector is expected to pass 200 miles South of the big island of Hawaii on Wednesday.
Swells generated by Hector are expected to reach the southeast and east shores of the Big Island and eastern Maui later Wednesday, and produce large and risky surfs.
West of Mexico, Hurricane John was forecast to strengthen into a major hurricane while heading to the northwest parallel to the shore.
Far out to sea was newly formed Tropical Storm Kristy, which had sustained winds of 50 miles per hour and could become a hurricane.