UPDATE at 9:15 p.m.
The worst of the storm has left the Times Free Press coverage area. The Severe Weather Warning and Significant Weather Advisory are over.
UPDATE at 8:15 p.m.
Southern Hamilton County, Southwestern Polk County and Bradley County are now under a Significant Weather Advisory until 9 p.m. as a Wednesday evening storm continues to move through the area.
7:30 p.m. The Chattanooga area is under a severe thunderstorm warning until 8:15 p.m.
The alert was issued at 7:12 p.m. for Hamilton, Marion and Sequatchie Counties.
Some of the area could experience wind gusts up to 60 miles per hour causing damage to roofs, siding and trees, according to AccuWeather.