Severe thunderstorms possible this afternoon and evening.This is an alert to the potential development of severe thunderstorms with large hail, damaging winds or heavy rainfall..
A very unstable airmass lies across Southern Ontario. Scattered thunderstorms are expected to develop this afternoon. Some of these storms will be locally severe. There is also the risk for isolated tornadoes. The greatest threat for isolated tornadoes will be over northern portions of Southern Ontario, including the Ottawa Valley. Hence a tornado watch has been posted for those regions.

This watch is in effect for Brantford, Paris, Woodstock, Ingersoll, Oxford, Cambridge, Kitchener, Hamilton, Brant, Waterloo, Ancaster.

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