Overview

• Shoppers in San Juan stock up on essentials, anticipating potential power outages.
• Puerto Rico's southeast may see up to 10 inches of rain, raising concerns of flooding and landslides.
• The island's power grid, weakened by past storms, faces another significant challenge.
• Authorities emphasize the importance of preparation, opening shelters and urging caution.
• The National Hurricane Center warns Ernesto could strengthen into a hurricane after passing Puerto Rico.