1997 Illinois–Wisconsin Triangular UFO Wave

Record summary

During 1997, investigators recorded numerous reports of large, dark or illuminated triangular objects in Illinois and neighboring Wisconsin, including cases near Chicago and Lake Michigan. The reports are often discussed alongside, but are not identical to, the Phoenix Lights. This lead matters for studying how a national media cycle can connect geographically separate sightings and encourage a “wave” interpretation. Individual reports vary substantially in witness quality, duration, and documentation, and many are available primarily through civilian case files rather than standardized government records.