Non-severe thunderstorms are possible across Southern Ontario during the day on Saturday. This will begin with some storm activity in Northeastern and Central Ontario during the morning with some isolated pop-up storms later in the day. It’s unlikely these storms will reach severe levels, but flooding could be an issue in areas that see multiple storms throughout the day.
Thunderstorms are currently not expected in the forecasted region on this day.
A few isolated storms may cross into Extreme Southwestern Ontario during the afternoon and evening on Friday. However, at this time it appears very questionable and if the storms develop they should be quite weak so a forecast isn’t being issued at this time. More organized thunderstorm activity is possible overnight into Saturday which will be covered in Saturday’s outlook.
Thunderstorms are currently not expected in the forecasted region on this day.
Isolated pop-up storms are possible in parts of Southern Ontario during the afternoon and evening on Thursday. The areas most likely to see the storm activity includes London, Hamilton, Niagara and Kingston/Brockville. These storms should remain non-severe for the most part, however, severe thunderstorm warnings may be necessary from Environment Canada due to the potential for some heavy rainfall. Regardless, the storms will be quite weak so flooding will be the biggest threat along with strong wind gusts and small hail. The risk will come to an end late in the evening.
Isolated storms may develop through parts of Northeastern Ontario along the Quebec border on Wednesday. This could bring the threat of damaging wind gusts, large hail, heavy downpours and maybe even an isolated tornado. The strongest threat is during the afternoon and into the evening. We should see the storm threat come to an end by late evening.
The environment is favourable for some severe thunderstorm development throughout the day on Wednesday for parts of Southern Ontario. However, there is some uncertainty if storms will actually be able to develop. Some models aren’t showing much in terms of storm activity during the afternoon when the environment is the best for severe weather. While others are showing storms but earlier in the day during the morning when the environment will be weaker.
If we do see a few pop-up storms (latest data suggests areas around Lake Simcoe have the best chance), they could quickly become severe with strong wind gusts, large hail and heavy downpours. It should be noted that these storms will be extremely isolated so not every location in the risk zone will see a storm. The tornado risk is present and an isolated tornado can’t be ruled out, but we aren’t seeing any specific areas of concern so we haven’t included it in the map and it’s not super strong.
Storms will come to an end by the evening hours as the daylight heat that helped fuel these storms disappear after sunset.
Some isolated thunderstorms are expected to develop over Southeastern Manitoba and Northern Minnesota, tracking into Northwestern Ontario by the late afternoon on Tuesday. These storms could have an isolated severe risk associated with them including large hail, damaging wind gusts and heavy rainfall. The tornado risk isn’t absolute zero, but it’s not strong enough to pinpoint on the map. An isolated tornado can’t be ruled out. The storm risk will continue overnight, but the severe risk will quickly dissipate after sunset.
Thunderstorms are currently not expected in the forecasted region on this day.
Thunderstorms are currently not expected in the forecasted region on this day.
Another day of isolated pop-up storms are possible in parts of Southern Ontario during the day on Monday. This time the focus will be on Central and Eastern Ontario for these slow-moving storms that have the potential to produce small hail, strong wind gusts and very heavy downpours. Flooding could be an issue in some areas should a storm become nearly stationary over a particular location. The storm threat will come to an end later in the evening after the sun goes down.
Thunderstorms are currently not expected in the forecasted region on this day.
Another humid and hot day will lead to some pop-up storms across Southern Ontario during the day on Sunday. These storms should be non-severe for the most part, however, like Saturday we could see a flooding threat and moderate size hail with some of stronger storms. Given that, we’ve decided to add an isolated severe risk through Central and Eastern Ontario, but important to note that most of the locations in this zone won’t even see a drop of rain. Any storms that have developed will start to weaken after sunset.
A few thunderstorms might be possible through North-central and Northeastern Ontario on Saturday although they should be rather weak and isolated.
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.
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.
Thunderstorms are currently not expected in the forecasted region on this day.
Thunderstorms are currently not expected in the forecasted region on this day.
Thunderstorms are currently not expected in the forecasted region on this day.
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.
