The Latest on Hurricane Hector churning closer to Hawaii's Big Island.
On the other side of the Pacific, Typhoon Shanshan is approaching Japan with maximum winds around 100 miles per hour.
Hurricane John was centered about 320 miles southwest of the Mexican port of Manzanillo, with maximum sustained winds of 75 mph late in the afternoon. Sub-tropical Storm Debby was heading north at 15mph on Tuesday evening, with maximum force winds of 40mph, but it is expected to dissipate before the week is out.
Still, the National Hurricane Center issued a tropical storm watch Monday for parts of the Big Island, including Hawaii County, where Kilauea Volcano has destroyed more than 700 structures in three months.
The storm was centered about 1,160 miles west of the Azores and was moving north near 16 mph. 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. Combined with high tides, this could lead to some overwash of low-lying coastal areas and perhaps some beach erosion.
An American-based meteorology group has said cool water in the Atlantic could lead to fewer tropical storms this year.
Rain showers may be locally heavy at times, particularly over east to southeast around midnight, or sooner if conditions warrant.
The effects of a hurricane are far-reaching and can extend well away from the center.
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 hurricane center reported.