At 8 a.m. Saturday, the National Hurricane Center issued an advisory stating that Tropical Storm Melissa is in the Caribbean Sea, 160 miles southeast of Kingston Jamaica and 235 miles southwest of Port Au Prince Haiti. The system, with maximum sustained winds of 70 mph, is moving west-northwest at 1 mph.

Dozens of people were already in shelters in the Dominican Republic, and schools, businesses and government agencies were closed.

Melissa is currently the only active tropical system in the Atlantic basin. As of Friday night, the storm remains nearly stationary, drifting north at just 2 mph. Maximum sustained winds are around 65 mph—just below the 75 mph threshold needed to reach Category 1 hurricane status.

At 5 a.m. Saturday, the National Hurricane Center issued an advisory stating that Tropical Storm Melissa is in the Caribbean Sea, 180 miles southeast of Kingston Jamaica and 245 miles southwest of Port Au Prince Haiti. The system is moving northwest at 3 mph, with maximum sustained winds of 65 mph.

Melissa had 65 mph winds early Friday. It could strengthen into a hurricane Saturday and a major hurricane later in the weekend.

Forecasters warned it could strengthen and swipe Jamaica as a powerful hurricane and dump a staggering amount of rain.

According to the National Hurricane Center's 5 p.m. Saturday advisory, Tropical Storm Melissa is in the Caribbean Sea, 155 miles southeast of Kingston Jamaica and 235 miles southwest of Port Au Prince Haiti. The system is moving to the west-northwest at 1 mph, with maximum sustained winds of 70 mph.

Tropical Storm Sonia is churning in the Pacific Ocean and isn’t threatening land. The U.S. National Hurricane Center says the storm formed over the weekend and on Monday was about 965 miles southwest of the southern tip of Mexico’s Baja California peninsula.