Went outside my workplace building to the parking lot to have a smoke with a clear view of the northern and western sky looking beyond the freeway from Lakeland Blvd. The north and west is currently overcast with dark clouds which allowed me at first glance to spot, via contrast, what initially appeared to be a white bird, possibly a seagull, following a western trajectory well above the tree line. This initial observation was proven false by comparing the tree size to the object as the object was much larger than a bird in relation to distance and nearby objects. The white object appeared to be moving at a high rate of speed with erratic up and down movements (zig-zag pattern) until finally disappearing into the clouds in the west. This lasted approximately one minute. It also appeared to be followed by a second object, but the power lines obstructed my view and it disappeared as suddenly as it appeared. To the north is Lake Erie which is approximately 4 miles from my location. To the west is Downtown Cleveland. This is not my first sighting of unexplained phenomena in the sky. This is, however, my first reporting of such an occurrence.