Potential Tropical Cyclone One-C strengthened today as it moved toward Hawaii, with forecasters saying the system is expected to become a tropical storm Thursday and that a tropical storm or hurricane watch could be required for portions of the state by early Thursday.

A potential tropical cyclone was headed toward Hawaii on Wednesday morning Hawaii time, according to the latest advisory from National Hurricane Center. The system, which forecasters are tracking with the name “One-C,” is expected to become the next ...

The National Weather Service in Honolulu says the Big Island and islands of Maui County currently have the highest potential for heavy rainfall, although that forecast could change as the system develops and its track becomes clearer. The disturbance is ...