BIRMINGHAM, Ala. – The National Hurricane Center outlines Potential Tropical Cyclone 18 in the Caribbean Sea ahead of its impacts on Jamaica and the Cayman Islands. This system will likely develop into Tropical Storm Rafael on Monday before impacting Jamaica and the Cayman Islands on Tuesday. Tropical storm warnings encompass Jamaica, and hurricane watches surround the Cayman Islands. Heavy rain could cause local flooding and mudslides across the regions.