Gustav was moving slowly, an ominous development for Haiti where hillsides have been stripped of trees and heavy rains frequently cause disastrous mudslides, the U.S. National Hurricane Center said.
At least two people were killed on Tuesday in a mudslide in Haiti.
In the neighboring Dominican Republic, eight people -- seven from the same family -- were buried under mud when a hillside collapsed just north of Santo Domingo.
There's nothing but cash induced adrenalin in the hearts of oil speculators as the price of oil wobbles with the Gulf filled with oil rigs and the potential for disaster to oil supplies making the prices jump like a wet cat.
Concerns that Hurricane Gustav would strike installations in the Gulf of Mexico in coming days sent energy prices higher. Crude futures climbed $1.16 to $116.27.
Gustav is "still a long way from oil and gas infrastructure, but gas traders will be keenly focused on direction/magnitude of this summer's first storm to potentially impact energy markets," securities firm Tudor Pickering Holt & Co. told its clients Tuesday morning.