The National Weather Service in Nashville has issued a flash flood watch for all of Middle Tennessee through 10 a.m. on Sunday.
Meteorologist Bobby Boyd said 1-2 inches of rain are possible just during the overnight hours tonight.
That brings the total expected rainfall through Sunday to three inches or higher in Nashville and some local rainfall amounts could be higher.
"We've just got too much going here," Boyd said. "If we get what I think we're going to get tonight, it could be bad."
At 1:36 p.m., a flooding report came in from Waller Road about two miles northwest of Brentwood in Williamson County.
Al Creek is flooding, causing water to run over driveways on Waller Road, the report said.
While heavy rainfall is possible, Boyd does not see a repeat of the May 2010 flood in our future.
"One thing we don't have with this event is the tropical connection," he said. "We had a tropical connection out of Guatemala that year, which basically means a moisture feed was coming in from South America.
"We don't have that this time. We are going to get heavy rain and we are going to get flash flooding, but it's not going to be the magnitude of May 2010."