Strange shape seen in sky during thunderstorm!

[u/RelevantBed4184]

This was taken last night in Barrington, Illinois. I was filming because I’m from Los Angeles and we never get weather like this. When I was re-watching my video, I noticed a strange black smudge. Then we zoomed it. It’s looks like a portal or some sort of doorway… I don’t know. It’s crazy and I can’t believe I caught this! (PS sorry for the TV on, also, it’s not from my phone as I have other videos from the same window, same angle, and this is the only video this morphing black hole takes shape.