It seems Vaughn (York Region) was hit the hardest.
We're in Brooklin (Durham) and the storm hit around 7:30PM. The skies were very creepy, a lovely shade of dark green/grey. Oddly enough, I found the storm a few weeks ago worse.
We haven't had anything this bad in Ontario since the Barrie tornado back in the early 80's. But I agree with the PP, I think we'll have more of this in the coming years as the climate changes.