While John is expected to pass west of Baja, an increase in storm size or an eastward jog in the track could bring tropical storm conditions to the region.
Meanwhile, Subtropical Storm Debby formed far out over the north Atlantic, but it was expected to be a short-lived storm.
Maximum sustained winds are near 75 km/h with higher gusts and little change in strength is forecast today, with slow weakening expected to begin late tonight or on Thursday.
Hector also posed no immediate threat to land, but the center said people in Hawaii should monitor the storm's progress as it was projected to pass just south of the islands by midweek.
As a precaution, Hawaii County officials closed three beaches on the Big Island, according to Hawaii News Now.
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Is there a State of Emergency on the Island of Hawaii? Swells generated by Hector are expected to reach southeast and east facing shores of the Big Island and eastern Maui late today, likely becoming large and risky by late tonight and Wednesday.
Residents along the affected shores should be alert for high and risky surf conditions.
On Aug. 6 at 4:40 a.m. EDT (0840 UTC) the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA's Terra satellite analyzed Tropical Storm Ileana's cloud top temperatures in infrared light.
Farther out to sea, a strengthening Hurricane Hector headed for the central Pacific as a Category 4 storm, with winds of 140 miles per hour (220 kph), the Center Pacific Hurricane Center in Honolulu reported. Some local flash flooding is possible in a few spots, particularly along east-, south- or southeastward-facing slopes of the Big Island.