At 10:54 am Environment Canada issued the following:
Risk of severe thunderstorms and isolated tornadoes developing this afternoon. This is an alert to the potential development of severe thunderstorms capable of producing tornadoes.
A line of thunderstorms is expected to develop over Michigan this afternoon then track rapidly eastward into Southern Ontario. Some of these storms are expected to be severe with large hail damaging winds torrential downpours and frequent lightning. These storms will also be capable of producing tornadoes. The threat for severe weather is expected to reach areas near Lake Huron near mid afternoon and the remainder of the regions in the late afternoon or early evening.