Genuinely gutted I missed this, I've been following the Lake Michigan corridor for a while now because there's a noticeable cluster of triangular reports from that area going back to the early 90s.
Quick question for those who saw it - was the light configuration the classic three white corners with a central red or amber light, or something different? That distinction matters quite a bit when you're trying to separate the TR-3B style reports from the genuinely unexplained ones. Also trying to work out the altitude from witness accounts. The ones that get my attention are the ones that appear to be below commercial flight paths and moving too slow to generate conventional lift.
I'm based in Whitby so obviously couldn't get eyes on it myself, but I do document these things and this fits a pattern I've been compiling. If anyone has raw footage even phone footage with the timestamp intact, that would be massively useful. Even the metadata tells you something.