Strange black/silver object seen flying in front of storm.There was a storm today in Minnesota and a grandfather figure of mine and myself love watching storms so we were hanging out in his garage to observe. Occasionally stepping out to observe the sky better.We stepped out to look more and were focused on a morning dove on the power line. But then we saw this strange, black object gliding across the sky. There was no sound, no visible lights, it did not look like any known object to me or the person with me, it was clearly not a weather balloon, and it was under the storm clouds.It seemed to be just a black sphere-like object, but then it made a slight turn (or it was spinning the whole time) and we saw curves on it and it had a metallic silver color on it as well. We kept our eyes focused on it as long as we could until it got too far away for us to see. Immediately afterwards, rain started pouring on us. It's almost as if it was riding straight in front of the storm.My grandfather figure used to be a helicopter engineer for many years and he said that in his fifty-four years of living that he has never seen an object shaped like that in the sky. The way it glided across like nothing and made absolutely no sound seemed so unusual. Me and him both strongly believe that we have seen a UFO.I, in no way, have had as much experience as him when in comes to aircrafts, but I want to be an astronomer, so there has been many nights were I have observed the sky with my telescope and I have done a lot of research, but I have never seen anything quite like this. I thought it was worth sharing.