The National Weather Service has issued a flash flood warning for DeKalb, Fulton and Gwinnett counties in effect until midnight.
Sunday's weather system has brought with it high winds, flash flooding and the potential for flooding of area creeks and rivers, in addition to delays at Hartsfield-Jackson Atlanta International Airport.
At 7:30 p.m., the Federal Aviation Administration reported some arriving flights were delayed an average of 4 hours.
There is a "traffic management program in effect causing" the delays, the FAA reports, including some departure delays.
They advise travelers to check with their airlines to determine if their flight is affected.
Heavy rains caused a Delta flight from Wichita to Atlanta to be diverted to Huntsville, Sunday afternoon. It was expected to land in Atlanta around 2 p.m.
At 6:30 p.m. the flight was re-boarding in Huntsville after refueling.
Now that the "worse of the storm" has passed, they are not expecting Sunday's delays to have any effects on flights Monday, Heather Faulkner, Delta spokeswoman told the AJC.
"We are now in recovery mode," she said. "Due to the storm we could not get in or out, but we are pretty confident that we will be able to get caught up tonight."
The weather system has brought with it high winds, flash flooding and the potential for flooding of area creeks and rivers, said forecasters.
The tornado watch issued earlier today by the National Weather Service expired just before 6 p.m., but flood watches, warnings and a wind advisory are expected to last throughout the evening and early morning Monday.
Storms rolling in from the west were expected to bring 1 to 2 inches of rain accompanied by wind gusts up to 25 miles per hour, forecasters said. The flood watch extends through 10 p.m. In addition, a flood warning has been issued for Big Creek in Alpharetta and Suwanee Creek in Gwinnett County.
Yellow River in Conyers is expected to rise above flood stage by Monday morning, reports the NWS. At 11 a.m. Sunday, the stage was at 4.4 feet and rising. Flood stage is 11 feet and is expected to rise to near 12.9 feet by Monday.
As of 4 p.m. Sunday, Big Creek near Alpharetta is at 4.5 feet and expected to rise near 9.5 feet by early Monday, said the NWS. The flood warning in effect until Tuesday afternoon. Flood stage is 7 feet.
Suwanee Creek is at 2.3 feet as of 4:45 p.m. and expected to rise to close to 8.2 feet by Monday morning, .2 feet above flood stage.
Areas such as Cherokee, Cobb, DeKalb, Rockdale, Coweta and Clayton are under a flood watch until 10 p.m. Sunday.
Gwinnett is under a flood warning until 3 p.m. Monday and Forsyth and Fulton until Tuesday.
The Georgia Department of Transportation has received unconfirmed reports of flooding on the Downtown Connector through Atlanta.
The agency's information management center said just before 5 p.m. that they'd gotten a call from a motorist about flooding in the right lane of the southbound roadway near Langford Parkway.
HERO officials checked the area and reported there was no flooding in the area.
The wind advisory for most of north and central Georgia was canceled at 7 p.m. and a high wind warning was canceled at 3 p.m.
There's a risk of large hail and isolated tornadoes, according to forecasters.
Sunday's rain should give way to mostly sunny skies on Monday, with the next chance of rain coming on Thursday.
-- Staff writer Ty Tagami contributed to this article.
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