1:13 PM update: Pembroke getting hammered now. A few popcorn storms are appearing in advance of the main line.
As I postulated on Tuesday, there is a strong cold front coming through later today bringing cooler temperatures for a few days.
However, its approach will also stimulate some feisty weather. Env. Can. has issued a Tornado Watch. I think is interesting because they haven't issuing a Severe Thunderstorm watch and, as you know, one begets the other. Anyway, it is unlikely but not out of the realm of possibility that a tornado will spin up.
The main line of severe weather is crossing Georgian Bay right now but individual storm may pop up in advance of it.
Just be aware.