Tropical Storm Oscar doused Cuba on Monday, three days after a massive power failure plunged more than 10 million people into the dark as the island worked to restore its decades-old power grid.

"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 is 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 was heading toward the Bahamas late Monday after dumping heavy rain across eastern Cuba. A tropical storm warning was in effect for the central and southeastern Bahamas.

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

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.

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.

Forecasters predict Oscar to bring "heavy rainfall" leading to areas of "life-threatening flash flooding" across eastern Cuba.

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.