It's not just you -- Tuesday's storms were absolutely electric. Nearly 4.5 million lightning events were detected, which is the busiest the skies have been since May 20, 2017, according to experts who follow the charge. "Based on research that I've done looking at lightning counts across the United States, the top 1% of lightning days produce about 3.1 million lightning events, so this was truly a high-end day," Chris Vagasky, lightning applications manager at Vaisala, told CNN. The last time the skies were this electrified was nearly four years ago, when more than 4.5 million lightning events were detected. Satellites capture imagery of the busiest lightning day in years