The National Hurricane Center is monitoring two disturbances in the Atlantic—the first poised to approach the northern Leeward Islands later this week and the second near the Cabo Verde Islands—while Hurricane Erin, now a Category 3, heads away from the Caribbean.

Tropical Storm Erin is forecast to rapidly strengthen into a hurricane this weekend as it nears the northeastern Caribbean and Bahamas, raising concerns for strong winds, heavy rain, and dangerous surf along the islands.

The Atlantic’s first hurricane of the season had maximum sustained winds of 160 miles per hour, forecasters said.