“It will become much more humid,” said Frank Giannasca, meteorologist with the Cobb-based Weather Channel. “It’s that really thick, tropical air.”
The area could see rain move in as early as Monday night and last until Thursday or Friday. National Weather Service meteorologist Matt Sena said between 1 and 3 inches of rain could accumulate in that time.
While the worst rain is expected in Louisiana, southern Mississippi and southeastern Alabama, the storm could always change course.
“People just need to keep constant attention on any changes in the forecast,” Sena said.
Certain localized areas could even see flooding, Giannasca said. But it is too early to say where that will be.
“When you get under something, it could come down very hard,” he said.
Austell Mayor Joe Jerkins, whose city suffered major flood damage after 20 inches of rain fell in a matter of days in 2009, said he was keeping an eye on Isaac. But with Sweetwater Creek, which went more than 20 feet over its banks in some areas in that flood, at a low water level currently, he said it would take a powerful storm to cause major damage.
“I don’t think we’re going to get eight inches of rain,” Jerkins said. “We’d have to get eight inches of rain before we’d even have to close the road.”
Isaac was expected to make landfall as early as Tuesday, possibly in Louisiana, south of New Orleans. A hurricane warning was in effect from Morgan City, La., east to the Alabama-Florida state line. Hurricane forecasters had posted a tropical storm warning further east to Destin, Fla.