Southern Ontario: Thunderstorm Outlook for Saturday, August 21, 2021

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Forecast Discussion

A few pop-up thunderstorms are possible throughout the day on Saturday across Eastern and Central Ontario. These storms should remain non-severe with small hail, strong wind gusts and heavy rainfall. Flooding could be an issue given how slow these storms are expected to move although it will be extremely localized. There may also be a few funnel clouds that develop during the day and while they rarely touchdown, an isolated landspout can’t be ruled out. The storm risk will come to an end late in the evening.

Northern Ontario: Thunderstorm Outlook for Friday, August 20, 2021

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Forecast Discussion

Strong to severe thunderstorms are expected to develop over Eastern Manitoba and track across the border into Northwestern Ontario during the afternoon and evening on Friday. These storms could bring damaging wind gusts, large hail and heavy downpours. There is also the risk of some tornadoes particularly through Kenora, Red Lake, Pikangikum and Sandy Lake. Storms will continue past midnight and into the early morning on Saturday, but they should be non-severe for the most part.

Northern Ontario: Thunderstorm Outlook for Wednesday, August 18, 2021

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Forecast Discussion

Thunderstorm activity including a few isolated severe storms is expected across parts of Northern Ontario stretching from the Manitoba border through to the Quebec border on Wednesday. The main risk will be during the afternoon and evening hours, but we could see some quite strong storms in the morning as they track into the province from Manitoba. There is also the risk of an isolated tornado for parts of Northwestern Ontario including Ear Lake, Sandy Lake and Fort Hope. Thunderstorms may continue overnight and into Thursday morning, but it’s unclear how strong they will be.

Southern Ontario: Thunderstorm Outlook for Wednesday, August 18, 2021

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Forecast Discussion

There is the potential for some isolated pop-up thunderstorms through Southwestern and Eastern Ontario on Wednesday afternoon and evening. These storms should remain non-severe with strong wind gusts, small hail and heavy downpours being the main threats. The risk for storms will dissipate by midnight although rain will continue overnight for some parts of the region.

Southern Ontario: Thunderstorm Outlook for Tuesday, August 17, 2021

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Forecast Discussion

There is the potential for some thunderstorm activity through parts of Southern Ontario on Tuesday. The main focus will be on the morning hours with some non-severe thunderstorms tracking through Southwestern Ontario, GTA and Eastern Ontario. Could also see some pop-up storms later in the day, but it’s questionable and any activity will be super isolated so unlikely most locations will see anything.

Southern Ontario: Thunderstorm Outlook for Friday, August 13, 2021

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Forecast Discussion

Some pop-up thunderstorms are expected to develop during the afternoon and early evening on Friday through parts of Central and Eastern Ontario along with around the Golden Horseshoe. These storms will be rather weak for the most part although two areas of concern including the Lake Erie shoreline and the Ottawa Valley may see some isolated marginally severe storms. The main risk will be strong wind gusts, small hail and heavy rainfall. We aren’t expecting that strong of a tornado risk although these pop-up storms do tend to bring some funnel clouds and maybe even a brief landspout. There is also a strong risk for waterspouts over Lake Erie. The risk will come to an end after sunset as the storms fizzle out.

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Southern Ontario: Thunderstorm Outlook for Thursday, August 12, 2021

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Forecast Discussion

A line of nocturnal storms over Michigan could bring some isolated severe risk to Deep Southwestern Ontario during the early morning on Thursday. The main threat will be damaging wind gusts up to 90km/h along with lots of lightning. Later in the day, there could be some popup isolated thunderstorms through parts of Eastern Ontario although it’s very questionable. It’s possible that we see no storm activity on Thursday besides the morning storms. If we do see some storm development in Eastern Ontario then we can’t rule out the potential for one or two storms to briefly reach severe levels with moderate-sized hail and strong wind gusts. The tornado risk is pretty low, but as usual, we can’t rule it out with any severe weather. There could be some more storms early Friday morning and later in the day, but the exact location is unclear at this point.