NEW ORLEANS—Hurricane Ida rapidly grew in strength early Sunday, becoming a dangerous Category 4 hurricane just hours before hitting the Louisiana coast while emergency officials in the region grappled with opening shelters for displaced evacuees despite the risks of spreading the coronavirus. As Ida moved through some of the warmest ocean water in the world in the northern Gulf of Mexico, its top winds grew by 45 mph (72 kph) to 150 mph (230 kph) in five hours. The system was expected to make landfall Sunday afternoon, set to arrive on the exact date Hurricane Katrina ravaged Louisiana and Mississippi 16 years earlier. Ida was centered about 60 miles (95 kilometers) south of the mouth of the Mississippi River, and 75 miles (120 kilometers) south-southeast of costal Grand Isle, Louisiana. It was traveling northwest at 15 mph (24 kph). Ida threatened a region already reeling from a resurgence of COVID-19 …