Erin strengthened into a hurricane on Friday as it approached the northeast Caribbean, prompting forecasters to warn of possible flooding and landslides. The storm is expected to remain over open waters,

Erin, the first hurricane of the season, is now forecast to become a Category 4 by Sunday. Here's where it could head in the week ahead.

Heavy rains were forecast to start late Friday in Antigua and Barbuda, the U.S. and British Virgin Islands and southern and eastern Puerto Rico.