However, only a small deviation to the north of the forecast track could bring tropical storm force winds to the Big Island later tonight or on Wednesday.
John was centered about 335 miles (540 kilometers) southwest of the Mexican port of Manzanillo early Monday, with maximum sustained winds of 60 mph (95 kph).
Debby poses no threat to land, as the storm is located about 1,150 miles west-northwest of the Azores.
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"Very rough surf is expected to impact mostly south- and east-facing coastal areas of the Big Island", AccuWeather meteorologist Dan Kottlowski said.
The storm began taking subtropical - not-quite tropical - characteristics, and was named Tuesday morning.
Meanwhile, Tropical Storm Ileana is trailing behind John and had been expected to become a hurricane, too.
Last week finished up with a hurricane and three disturbances in the East Pacific tropics.
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The Category 4 storm is moving westward at 16 miles per hour.
Hurricane Hector remains a category four storm as it slowly moves west towards the south of Hawaii.
Maximum sustained winds are near 65 miles per hour (100 kph) with higher gusts. The storm traffic for the rest of the season, which ends officially on November 30, won't be almost as robust, Philip Klotzbach, hurricane specialist at Colorado State University, which pioneered long-range tropical storm forecasting, said last week.
Building subtropical high pressure north of Hector will keep the hurricane on a generally westward course the next several days.
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