In October of 2010, while visiting my sister and her husband in Loomis, California I was sitting by their backyard pool. My sister was inside making lunch sandwiches and her husband had just gone in also, when I noticed what at first resembled a jet fuselage in the southeast sky above the large empty adjacent field. Then I realized that there were no windows, no wings, only a dull gray surface with a few apparent seams or lines. It was stationary, no sound, daylight so no lights were noticed. It seemed that as soon as I realized that this was a UFO, it suddenly wasn't there! It didn't shoot off into space, as I've seen before, but disappeared in an instant, like it had "cloaked", or slipped into another dimension? I ran in to get my sister and husband, but it was too late of course.