Tropical storm Debby strengthened a little overnight in the Atlantic, but forecasters say her time as the fourth named storm of the 2018 hurricane season may be nearing its end.
High rainfall from deep tropical moisture surrounding Hector is predicted to affect the Puna and Kau districts of the Big Island as the hurricane passes by south of the state.
The Category 4 storm is moving westward at 16 miles per hour.
Meanwhile, the Pacific remains active with three-named storms.
Hector's center will track about 150 miles south of the Big Island today, then continuing westward, remaining well south of the rest of the Hawaiian Islands through Thursday.
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Surf: Swells generated by Hector are forecast to reach southeast and east shores of some islands late Tuesday. Both are in effect from noon Tuesday through 6 p.m. Wednesday. Combined with high tides, this could lead to some overwash of low-lying coastal areas and perhaps some beach erosion.
Wind: Tropical storm force winds are possible across Hawaii Island late Tuesday and Wednesday. All these conditions tend to be associated with quieter Atlantic hurricane season.
On Monday, Hector's maximum sustained winds peaked at an estimated 155 miles per hour, just shy of Category 5 intensity, making it the strongest central Pacific hurricane since Ioke in 2006, according to Colorado State University tropical scientist Dr. Phil Klotzbach.
"The cloud pattern of Debby this morning is definitely typical of a tropical cyclone instead of a subtropical system with moderate convection wrapping around the center, and a well defined upper-level outflow in the eastern semicircle", forecasters said.
Latest forecast track for John.