"Some additional weakening is likely while Oscar moves across the mountainous terrain of eastern Cuba, but Oscar is forecast to be a tropical storm when it moves north of Cuba late today and then moves near the southeastern and central Bahamas on Tuesday," the hurricane center said Monday morning.

Tropical Storm Oscar remained crouched over eastern Cuba, where it could drop more than a foot of rain as it crawls over the island nation at 3 mph. Oscar was a tiny, weak storm, with tropical-storm-force winds extending just 45 miles from the center and maximum sustained winds at 40 mph.

Up to 20 inches of rain is forecast in some regions of Cuba, which could trigger flash flooding and mudslides.

Oscar, which the National Hurricane Center characterized as "very small," is the 15th named storm of the hurricane season.

Hurricane Oscar crosses Cuba's eastern coast with winds and heavy rain as residents protest power and water outages.

Tropical Storm Oscar was moving across eastern Cuba after making landfall as a Category 1 hurricane on the island already beleaguered by a massive power outage.

Tropical Storm Oscar dumped heavy rain across eastern Cuba on Monday after making landfall as a Category 1 hurricane on the island already beleaguered by a massive power outage. Its maximum sustained winds blew at 40 mph on Monday as Oscar moved northwest at 6 mph.