Tropical Storm Rafael is passing south of western Jamaica and is forecast to strengthen into a hurricane possibly by Tuesday evening.Rafael, which formed Sunday and was previously known as Potential Tropical Cyclone 18,

Tropical Storm Rafael was rapidly picking up steam on Tuesday afternoon as it chugged toward the Cayman Islands in the Caribbean, and will likely become a hurricane in the next few hours, according to the U.

Tropical Storm Rafael is expected to strengthen into a hurricane before making landfall in Cuba Wednesday, according to the National Hurricane Center.