Case 111184: Traci [last name withheld] and Lawrence were taking photographs of the Pacific ocean from Coronado Island, California. 

She noticed something strange in the upper left corner of the photo, but as soon as she realized that it was an odd, it disappeared.  The disc appeared to have a gray surface and simply hovered over the ocean. She estimated the size to be between 30 feet and 100 feet in diameter.  The sighting only lasted approximately three minutes.