(CBS/AP) Isaac is passing over the mid-Mississippi and lower Ohio Valleys bringing threats of heavy rain and isolated tornadoes.
To the south, flood waters are receding. Hundreds of homes and businesses remain flooded and hundreds of thousands of people are without electricity.
The storm is blamed on at least seven U.S. deaths - five in Louisiana and two in Mississippi.
Now comes what is certain to be an expansive and long cleanup.
Isaac touched down in Louisiana on Wednesday and lingered over the Plaquemines Parish state for days.
Much of Isaac's remnants have tracked out of Arkansas, which received three to six inches of rain, but National Weather Service senior forecaster Brian Smith said thunderstorms from the outer bands of the storm system could affect the northern half of the state on Saturday.
The storm knocked out power to thousands of people in Arkansas, and Ohio hotel operators said their holiday weekend business was already taking a hit as families canceled planned outings to theme parks.
The storm cut power to 901,000 homes and businesses in Louisiana alone, or about 47 percent of the state, but that was down to fewer than 620,000 by late Friday.
More than 15,000 utility workers began restoring power to customers there and in Mississippi, but officials said it would be days before power was fully restored.
Waters recede in Louisiana, leaving sopping mess
Isaac: Significant flooding, power outages on Gulf Coast
