Environment Canada has issued a severe thunderstorm watch for Barrie, Collingwood, Hillsdale, Innisfil, New Tecumseth, Angus, Midland, Coldwater, Orr Lake, Orillia, Lagoon City and Washago.
Conditions are favourable for the development of dangerous thunderstorms that may be capable of producing torrential rain.
Scattered thunderstorms are expected to develop this afternoon across southern Ontario. Given the high heat and humidity, a few of these thunderstorms could be intense, resulting in localized torrential downpours. These thunderstorms are expected to be slow moving, so some locations could receive in the order of 25 to 50 millimetres of rain over a short period of time. Localized wind gusts up to 90 kilometres per hour will also be a concern.