UFO sighted at 9pm cst flying due north at approx. 100-200 mph inverted cone 3'-5' diameter approx. 400' up in the sky, with no sound.Two of us where watching a large cumulus clowd to the south of Wichita, Kansas at approximately 9PM CST when a dark ufo like object appeared. It flew straight north at a high rate of speed, probably 100-200 mph. It was gone in approximately one minute. It was probably 3 feet in diameter on the top and maybe 5 feet in diameter at the bottom, this could only be seen from the side, when it was directly south of us. When it flew over it was circular from the bottom. It had to fly right over the Wichita airport, because we live 4 miles directly north of the airport. It was somewhere between 200 to 300 yards above the earths surface, and did not have any noise coming from it. It wasn't a bird, balloon or plane. I, have a science education, geology, and have worked for Boeing and Raytheon in the past (7 years total). We, myself; and my girl friend whom works directly for another aviation company, have lived here for approximately 3 years and have seen many airplanes, and birds (the sedgwick county park is nearby and is full of ducks and geese which fly over our neighborhood daily). Furthermore, I grew up on the farm, and have hunted and raised all kinds of birds, I', 41 years old. What flew over tonight was definitely not a bird, or a plane or a balloon. It was flying at a very high rate of speed, and was probably flying under radar, without sound. I seen it first while I was laying in the pool looking at the beautiful cumulus cloud directly to the south. As soon as I seen it, I told Susan, "look a UFO", jokingly, and moments later, the joke was not a joke no more, it was a real UFO. The first I have ever seen, and I have been looking, but have never seen any thing like this.