"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 chugged toward the Bahamas on Tuesday after making landfall in Cuba as a Category 1 hurricane, killing at least six people as it unleashed heavy rains on an island also hit by an unrelated massive power outage.

The NHC is also tracking tropical depression Nadine, which is expected to bring heavy rain to southern Mexico.

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.

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

Hurricane Oscar made landfall in Cuba late Sunday, just hours after striking the Bahamas. The system has since weakened to a tropical storm, but it is still expected to bring heavy rainfall and "life-threatening flash flooding,