Early-morning storms set the stage for an unsettled day across southern Ontario on Tuesday, with multiple rounds of thunderstorms pushing through. How we communicate severe weather in CanadaBe sure to keep up with the latest watches and warnings in your area. Baron - Ontario Tuesday risk - July 21Rounds of severe thunderstorms move through on TuesdayAn associated frontal boundary has moved into southern Ontario. While the highest tornado risk is expected to remain stateside, southern Ontario's primary threats include heavy rainfall and damaging winds. Baron - Ontario precipitation 5 pm - July 21This rainfall will provide some beneficial moisture to parts of central and southern Ontario following recent dry conditions.