Two Cloud like Oval objects came out of the Clouds over the Wasatch Mountains, Salt Lake City, Utah!!!

About 8:00 P.M. cooking hamburgers on my porch and my friend noticed something above the Wasatch Mountains and I looked up and could clearly see a Oval Cloud like structure moving around left to right and up and down.  From my vantage point it was slighlty above a whispy thin cloud.  As the object moved around it would change from the same color as the cloud below (which was white) to a dark gray (looked like a storm cloud color), but remained mostly white during the 2 min.  After about a minute and a half of watching this object and trying to make sense of what it might be another object, the same size but slightly grayer color came out of the cloud that the original object was floating over.  They both continued to move left and right and up and down for a few seconds and then they headed South over the Wasatch Mountains behind a tree in my view and I couldn't see them anymore.  All I know is my burgers were burnt and my Wife, my Best Friend and I could not believe what we were seeing and I have spent all night looking for some explaination of waht we had seen.