Erin, moving near the Leeward Islands, strengthened into a hurricane on Friday morning and is expected to pass north of Puerto Rico this weekend, the National Hurricane Center said.

Hurricane Erin is rapidly intensifying as it tracks above the northeastern Caribbean Saturday, churning up rough surf and sending rain and gusty winds to islands south of its path.

"There is even greater uncertainty in what impacts might occur in portions of the Greater Antilles, the Bahamas, the east coast of the United States, and Bermuda next week," the National Hurricane Ce...