Some also watch from the river on boats, docked in positions auctioned off for charity. An average of 625,000 people have attended each year since 1997, lining the banks of the Ohio River in Louisville, and across the river in Jeffersonville and Clarksville, Indiana. Thunder generally starts in the afternoon with an air show, followed by the fireworks show starting at 9:30 pm, along with a synchronized soundtrack through PA and radio. It officially began in its current location along the Ohio River in 1991 with fireworks, and an annual air show was added in 1992. 1990 brought the first nighttime fireworks event. It is the largest annual fireworks display in North America and began as part of an opening ceremonies event in 1989 with daytime fireworks. In years where Easter Sunday falls on the usually scheduled weekend, Thunder is moved a week earlier. It is generally held each April, about two weeks before the first Saturday in May. Thunder Over Louisville, the annual kickoff event of the Kentucky Derby Festival, is an airshow and fireworks display in Louisville, Kentucky. Annual kickoff event of the Kentucky Derby Festival Thunder Over Louisville

Horseshoe casino louisville ky