Lightning Strikes Across the US (IMAGE) University of California - Berkeley Caption This graphic shows the intensity of lightning flashes averaged over the year in the lower 48 states during 2011. Credit Data from National Lightning Detection Network, UAlbany, and analyzed by David Romps, UC Berkeley. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.