HONOLULU (AP) — Iona strengthened to a Category 3 hurricane several hundred miles south-southeast of Hawaii, but poses no threat to the islands, the U.S. National Hurricane Center said Tuesday. Iona is one of two major weather systems in the central Pacific Ocean. In its latest advisory, the Miami-based center said Iona was about 790 miles (1,271 kilometers) off Honolulu, with maximum sustained winds near 115 mph (185 km/h).