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.

As of Saturday morning, Hurricane Erin had strengthened into a Category 5 storm with maximum sustained winds of up to 160 mph, the National Hurricane Center said. The storm is currently located about 105 miles north of Anguilla and about 235 miles east-northeast of San Juan, Puerto Rico. Erin is moving west at 17 mph.

SAN JUAN, Puerto Rico — Hurricane Erin exploded in strength to a Category 5 storm in the Caribbean on Saturday, rapidly powering up from a tropical storm in a single day, the National Hurricane Center said.