Sign up for our NewslettersPTC 18 in the western Caribbean SeaPotential Tropical Cyclone 18 is a broad area of low pressure in the South Central Caribbean Sea. According to the NHC, the system is expected to become Tropical Storm Rafael in the next day or two as it moves toward Jamaica,

The National Hurricane Center has issued advisories for Potential Tropical Cyclone 18, an area of disorganized showers and thunderstorms in the Caribbean Sea.A

The National Hurricane Center has started advisories on PTC 18, which is likely to become the next named storm of the season.