LAMB COUNTY, TX - MAY 9: Cloud to ground lightning strikes during a supercell thunderstorm, May 9, 2017 in Lamb County, Texas. Tuesday was the group's second day in the field for the 2017 tornado season for their research project titled 'TWIRL.' With funding from the National Science Foundation and other government grants, scientists and meteorologists from the Center for Severe Weather Research try to get close to supercell storms and tornadoes trying to better understand tornado structure and strength, how low-level winds affect and damage buildings, and to learn more about tornado formation and prediction. (Photo by Drew Angerer/Getty Images)