Heavy rain tomorrow is expected to exacerbate flooding in Louisville, but the full effects won't be seen until later in the week.National Weather Service hydrologist Mike Callahan says rain will fall off and on tonight and pickup tomorrow shortly after sunrise. It will continue throughout the day, bringing enough water to raise the Ohio River to 33 and a half a feet, more than ten feet above flood stage. But, Callahan says the rise will happen slowly and likely peak Friday."Actually, the river might drop a little bit between now and then. Just an inch or two," he says. "That heavy rain is going to push it to 33. Right now the river is running about 30 feet."Callahan says the river will recede very slowly. Flooding is worse downstream of Louisville.