During the late morning of June 16, 2017, a line of supercells started forming across eastern Colorado, far eastern New Mexico, southeast Wyoming and southwest Nebraska. A supercell storm in western Kansas produced the first tornado at 12:41 PM CDT. The supercells continued producing tornadoes for the next eight hours before gradually consolidating into a MCS that brought widespread damaging wind gusts and additional tornadoes to areas farther east overnight. After the initial line of storms passed through, a weaker secondary line of storms formed behind it and produced about a dozen more tornadoes, some of which struck places that had already been impacted by the first wave of storms. This second wave quickly fizzled out after sunset. One particularly unusual supercell dropped seven torna