 Thereafter, Dora fluctuated significantly in intensity due to changes in water temperatures and wind shear, with the storm ranging from peak intensity as a Category 4 hurricane to a low-end Category 1 hurricane over a period of four days.While passing well south of the island of Hawaii on August 16, Dora briefly regained major hurricane status.On August 18, the cyclone passed just south of Johnston Atoll as a Category 1 hurricane.