Thunder Over Louisville http://thunderoverlouisville.org will be held this year on April 16. It serves each year as the official opening of the Kentucky Derby Festival and is rated as one of the top 100 events in North America. More than 500,000 people are expected to attend the day-long event this year. The Thunder Air Show will dazzle the crowd with more than 100 planes, aerobatics teams, daring sky diving teams and breathtaking stunts. Then, when it gets dark, the Thunder rolls. The fireworks will feature the latest in pyrotechnic power from Zambelli Internationale, America's "first family of fireworks". Six barges that are 100-foot open top each will be assembled on both sides of the 2nd Street Bridge to form the stage from which the fireworks spectacular ignites. The breathtaking and mind-numbing 28-minute show includes Thunder's signature one-mile "waterfall" effect off the bridge, making the fireworks seem to rain down forever. And in the crowd's memory of the show, it certainly does! After more than a decade, the show remains the largest annual pyrotechnic display in North America.