Black flying saucer over Oak Hill during a storm

On May 28, 2015, during a storm, a person has photographed a possible flying saucer since Oak Hill, in Kansas (USA). This UFO was dark and circular. What is it?

Witness statement:

I was taking pictures of the lightning during a storm with my cell phone. After viewing the pictures that I had saved I came across this picture that clearly has an object in it. I did not see anything with my eyes nor did I hear anything outside other than the thunder and light rain. I was sitting in the open doorway with no obstructions in front of me.