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 on the cusp of strengthening into a hurricane, which it is expected to become later this Friday, as it bears down on the northern Caribbean islands.

Hurricane Erin has passed over the Caribbean’s northern Leeward Islands, including Sint-Maarten, Saba, and Sint-Eustatius, as a Category 4 storm, causing minimal structural damage but prompting widespread safety warnings,