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

SAN JUAN, Puerto Rico (AP) — Tropical Storm Rafael chugged toward the Cayman Islands on Tuesday and was forecast to strengthen into a hurricane en route to Cuba. The storm was located 105 miles (170 kilometers) southwest of Kingston, Jamaica, early Tuesday.

A broad area of low pressure in the western Caribbean Sea is becoming better organized and the National Hurricane Center is initiating advisories on the system as of 4 p.m. Sunday. The disturbance is being called Potential Tropical Cyclone Eighteen,