Saw a metallic, daylight disk that left a wake in the clouds.

My UFO Sighting  On a Sunday morning in February of 1994, I saw an Unidentified Flying Object (UFO) from the window of my twenty-first floor apartment in Toronto, Ontario, where I was living at the time. I had just gotten home from working the night shift as a security alarm monitoring station shift supervisor and was preparing to go to bed to rest up for my next shift when I heard the sound of a helicopter flying by at some distance from my building. As a lifelong aviation enthusiast who takes notice when any aircraft flies close by, I got out of my bed and went to the window to see if I could see the helicopter, which I did. It was a Bell Huey, flying from east to west along the north shore of Lake Ontario – which was approximately 2 kilometers from my location – at an altitude of roughly 800 to 1,000 meters at a speed I estimate to have been 80 to 100 knots. From what I could see, the helicopter was predominantly light, possibly white in colour, but I could not tell what subtype of Huey it was from my distance (eg., a UH-1D, UH-1H, UH-1N or Twin Huey). The weather conditions at the time were overcast (approximately 9-10ths to 10-10ths cloud cover) but reasonably bright, with the cloud ceiling at roughly 2,000 to 3,000 meters, and there was a brisk wind at ground level.
 As I watched the Huey fly along the lake, I caught some motion out of the corner of my left eye and looked up. There, just below the cloud deck, was a small, round, metallic-looking, “discoid” shape that very much resembled the head, or nub, straight pin, moving in a stable, straight line course almost directly south towards the lake. It was moving a good deal faster (speed roughly 200 - 300 knots) than the helicopter and looked to be about the size of a head of a pin when held ten or twelve centimeters in front of your face, so I’d estimate it’s size to have been eight to ten meters in diameter at the altitude it was flying at. It showed no irregular motion or changes in altitude or direction. But what was remarkable was the fact that the brisk wind – which I think was from the northwest – didn’t seem to affect it’s flightpath at all; it maintained a straight and steady bearing south to the lake without exhibiting any drift. At one point, it passed through a slightly lower bank of clouds and produced a straight line wake in the clouds that lasted no more than two seconds. When I looked away to the Huey for a second, which was continuing on it's own course, then looked back to the object, it was gone. The sighting lasted less than 10 seconds and it was absolutely astonishing.
 As I mentioned before, I have a lifelong interest in aviation and flying, and am fairly expert at identifying a wide variety of aircraft of all types from military to civilian, antique to modern. I am also an amateur astronomer and also have an interest in meteorology, so I am very familiar with what’s in the sky on a daily basis. I cannot speculate on what it was because I could not identify it, but I can say that it was no conventional aircraft, helicopter, or balloon in any way, shape, or form, nor was it any celestial object such as a meteor or a weather-induced optical effect such as a “sundog” simply because the conditions did not exist to observe sundogs or anything similar. I don’t know what it was, but I’ve never seen anything like it.
((initials deleted))  Whitby, Ontario
Witness indicates that date of sighting is approximate.  PD