Hurricane Ernesto strengthened into a Category 2 storm late Thursday as it barreled towards the island of Bermuda, forecasters said, while nearly 300,000 people in Puerto Rico remained without power. John Cangialosi, a senior specialist at the U.S. National Hurricane Center (NHC), said Ernesto’s maximum sustained winds increased to 100 miles per hour (155 km/h) with higher gusts on Thursday night. Further strengthening is possible. As of 11 p.m. AST on Thursday, the center of Ernesto was located about 410 miles (660 kilometers) southwest of Bermuda, according to NHC. The hurricane is moving to…