Later in the evening back in Toronto, the squall line continued through the city dumping heavy rain and this unfortunate driver lost control after his vehicle hydroplaned through a T intersection and crashed down an embankment. Fortunately him nor his passengers were injured.

Not bad, 399 km

Here's the radar shot at 7PM EST showing where the meso scale outflow boundary (gustfront) actually lies relative to the precipitation. You can see the outflow is a good 40 - 50 km ahead of the actual precipitation, that's why things were so deceptive. Usually outflow does not lay that far ahead of the main body of the squall line and if it does, the squall line is usually moving along at 100+ km/h