Tropical Storm Ernesto is intensifying as it approaches Puerto Rico, with forecasts predicting it could reach hurricane strength within 24 hours. The storm is expected to bring heavy rainfall, with totals of 8 to 10 inches likely, raising concerns about flash flooding and mudslides, particularly in southeastern Puerto Rico. Hurricane watches and tropical storm warnings are in effect for the U.S. and British Virgin Islands, as well as Puerto Ricos' smaller islands, Vieques and Culebra. Governor Pedro Pierluisi has mobilized the National Guard and closed public schools, urging residents to prepare for potential power outages due to the fragile state of the island's electrical grid. The storm's winds have already risen to 65 mph, and coastal areas may face life-threatening storm surges. Preparations are being made across the region as Ernesto continues to impact Caribbean islands.