A formerly tornadic supercell that developed in Wyoming, crossed a small part of Nebraska, became tornadic, crossed a lot of northeastern Colorado, and was headed for Nebraska again, became heavy-precip in character and sparked prolifically along the way. This flash traveled along the very edge of the rear-flank hook core from the cloud base almost to the ground, then went inside the rain foot.
8 SSE Iliff CO (28 Jun 23) Looking NE
40.6503, -103.043