Hurricane Ike has pounded north-eastern Cuba with 120mph (195km/h) winds, torrential rains and massive waves that have rolled through coastal towns, killing four people.
State-run television showed waves slamming into sea walls and in the city of Baracoa surging as high as five-storey apartment buildings.
Officials said more than 800,000 people were evacuated as Ike approached.
Hurricane Gustav damaged about 100,000 homes on the east of the island and emergency officials say they have never had to deal with two storms in such close succession.
Although better-equipped to deal with storms than Haiti, with which it shares the island of Hispaniola, the Dominican Republic has reported more than a dozen deaths from this year's storm season.
More than 40,000 people were driven from their homes by Ike, and one man was crushed by a falling tree.
Earlier, Hurricane Gustav had battered the nation, which lies to the east of Haiti, leaving eight people dead.
The most deadly storm of the season so far has been Hurricane Gustav, which killed a total of 26 people in the US.
The entire city of New Orleans was evacuated amid fears of a repeat of Hurricane Katrina, which wrecked the city in 2005.
A disaster of that magnitude was averted, with 19 people killed in Louisiana, four in Georgia and three in Mississippi.
Earlier Tropical Storm Fay left at least 10 people dead in Florida after hugging the state's coastline for days, making landfall several times.
Although spared the worst of the hurricane season this year, Jamaica was battered by Gustav when it was at tropical-storm strength.
Winds of up to 110km/h (70mph) ripped the roofs off houses and left the capital, Kingston, deserted.
Nine deaths were blamed on the storm.
Turk & Caicos: