Enkil,
It was strong. I live in the West Island and the storm passed directly over our area! Thr rains were heavy and the lightning was strong, but not frequent like the big one we had in August, plus there were loud thunderboomers. It was vibrating. I also know that it went to the greater Montreal area right after and intensified. All I have to say is that it was a pretty good storm to end off the summer! I watched from my usual spot. I saw a fork-like lightning shape! Then the thunder went!
If you only were hearing it, that means that you could either see it from a distance or it just clipped your area. Did you see any impressive lightning bolts from your house?
As for the "surprise display," I guess no one was notified about it, so I guess people in the streets of Montreal at the time were fortunate enough to see it.
BTW, today is the last day of Summer.

However, tomorrow's forecast is looking summer-like!

But, then a cool down for the rest of the week, so enjoy tomorrow, because this may be the last time we will experience this kind of weather, well not definitely, I hope!
Trav.
