This is a pretty infamous video catching a microburst event on camera https://www.youtube.com/watch?v=b_WmjWAGkLI (no injuries),

/r/aviation conversation on this video: https://www.reddit.com/r/aviation/comments/295ape/a_not_so_m...

I doubt there was a thunderstorm in the area in the middle of the winter

We’ve had thunderstorms in winter during snowfall Toronto.

https://en.wikipedia.org/wiki/Thundersnow

But the snow rates were slow enough yesterday that I don’t think that was happening.

yeah, "middle of winter" wasn't quite right, but the chances of a microburst during what is an otherwise already windy/gusty winter day are basically none