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,

The National Hurricane Center forecasts Tropical Storm Rafael to grow into the season’s 11th hurricane Tuesday as it moves toward Cuba with winds and storm surge expected to affect the Florida Keys this week.

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.