Thunderstorms are possible during the afternoon and evening on Monday. A few of these storms could be severe mainly through parts of Central and Eastern Ontario with flooding as the main threat. However, the confidence in this event is low at this time.
Non-severe thunderstorms are expected to develop along the Manitoba border and track into Northwestern Ontario during the late afternoon and evening hours on Sunday. The main threat with these storms will be strong wind gusts, small hail and heavy rainfall. All storm activity should come to an end by late evening.
Thunderstorms are currently not expected in the forecasted region on this day.
Thunderstorms are possible through Northwestern Ontario especially along the international border later in the day on Sunday. A few of these storms could approach severe levels, but confidence is low at this point.
Thunderstorms are currently not expected in the forecasted region on this day.
A very small localized zone through Eastern Ontario extending from north of Lake Ontario through Peterborough/Bancroft and up into Pembroke along the Quebec border could see a few pop-up showers and maybe one or two non-severe thunderstorms during the afternoon on Saturday. These storms will quite weak and won’t pose much of a threat besides lightning and heavy rainfall. It will be extremely isolated so not every location within the risk zone will see rain or thunderstorms. The threat will come to an end by midnight.
Friday, July 2nd, 2021:
We’re closely watching for the likely development of severe thunderstorms this afternoon, evening, and into the overnight hours. There is a fairly strong environment in place and we could see hail up to 6cm in size, 120km/h+ damaging wind gusts, frequent lightning, and perhaps even some isolated flooding. There is also the risk for tornadoes to develop with these storms and if Environment Canada does end up issuing a Tornado Warning, we’ll of course be posting it to our Facebook and Twitter accounts automatically and sending it out instantly on our free app; Instant Weather.
Environment Canada has issued a Severe Thunderstorm Watch for some of the areas with potential:
Severe thunderstorm watch for CALGARY, RED DEER, and surrounding areas (click the image for further details)
Environment Canada also issued an experimental forecast map with similar locations highlighted to the watch regions and they have mentioned the risk for 1-5cm hail, 120km/h wind gusts, and the risk for a tornado:
Environment Canada’s experimental forecast map
PLEASE READ: For those wondering, these "prototype" maps are not yet available on EC's website. However, they will become operational soon and shared directly on their site. These forecasts and maps are issued by the same Environment Canada Meteorologists that issue all Watches and Warnings for the Alberta. They're also shared on Environment Canada's Twitter account and you can find it by searching for @ECCCWeatherAB.
Environment Canada's disclaimer says:
"Disclaimer: These products are part of an experimental initiative at Environment and Climate Change Canada (ECCC). These are not official ECCC products and therefore may not be available on a daily basis. Please continue to monitor weather forecasts as well as watches and warnings via http://www.weather.gc.ca/. Please address any questions, concerns and/or feedback regarding these products to the Decision Support Meteorologists at the Prairie and Arctic Storm Prediction Centre, available by email at ec.soutienmeteoouest-weathersupportwest.ec@canada.ca."
Long story short, please keep an eye out this afternoon, evening, and into the overnight for any alerts from Environment Canada and once again, you can get notified instantly of these alerts by downloading our free app; Instant Weather. Thank you so much to those who have downloaded it and a huge thank you to those who have subscribed to remove ads and upgrade to have 5 hours of future radar as you’re the reason that we’re able to offer our app for free to everyone else. Thank you! More details, ASAP.
Scattered thunderstorms are yet again possible across parts of Eastern and Central Ontario along with the GTA during the day on Friday. These storms should be non-severe for the most part although some localized severe storms with moderate-size hail and flash flooding like we saw on Thursday can’t be ruled out. At this time, the risk isn’t strong enough or focused on a specific location for us to introduce an isolated severe risk zone. All storm activity should come to an end quickly after sunset.
Thunderstorms are currently not expected in the forecasted region on this day.
A few thunderstorms are possible across Southern Ontario mainly during the morning and afternoon hours on Friday. The location of these storms is unclear at this time.
Thunderstorms are currently not expected in the forecasted region on this day.
Non-severe isolated pop-up thunderstorms are possible throughout Central, Eastern, Extreme Southwestern Ontario and around the GTA/Niagara region during the afternoon and evening on Thursday. These storms will be extremely isolated and not everyone will see them. Locations that do see the storms could be dealing with some flash flooding as there is the potential that these slow-moving storms could ‘train’ over a region for hours bringing 50-100mm locally. Other risks include strong wind gusts, small hail and frequent lightning strikes. Rain with embedded thunderstorms could continue into the overnight hours for Eastern and Central Ontario.
Thunderstorms are currently not expected in the forecasted region on this day.
Isolated non-severe thunderstorms are possible during the afternoon and early evening on Wednesday from Northeastern Ontario and into Eastern Ontario. Another zone for some storms that are more questionable exists from the GTA and along the Lake Erie shoreline. The main risk will be strong wind gusts, heavy rainfall and some small hail. The storms should quickly weaken after sunset.
Thunderstorms are possible throughout Southern Ontario during the day on Wednesday, but the exact area affected and how strong these storms will be is currently uncertain.
Isolated non-severe thunderstorms are possible across parts of Northern Ontario stretching from Thunder Bay through Kapuskasing and along the Quebec border during the day on Thursday. These storms will be quite weak and some might not be even strong enough to produce lightning. A few still could produce strong wind gusts, small hail and torrential downpours. The storm threat will come to an end just after midnight.
There is a fairly strong risk for severe thunderstorms on Tuesday throughout parts of Southwestern, Central and Eastern Ontario along with the GTA. The first round of storms will come in the morning which should be mainly non-severe. There is a questionable morning severe risk along the Lake Huron shoreline with damaging wind gusts, moderate-sized hail and heavy rainfall.
The main story will come later in the day as several isolated storms are expected to pop up in a zone stretching from Lake Huron through Lake Simcoe just to the north of the GTA sometime during the afternoon. The environment is favourable for any storm that develops to quickly become severe with damaging wind gusts, large hail and heavy rainfall.
There is also the potential for one or two tornadoes with the strongest storms although it’s not guaranteed. The biggest tornado threat exists through Simcoe County and around the Lake Huron shoreline. Wouldn’t be out of the question to see a waterspout develop over Lake Huron or Georgian Bay and come on land somewhere in the above-mentioned region.
We’ll see the mature storms track eastward as they move into the GTA and through Eastern Ontario north of Lake Ontario during the late afternoon and early evening hours. The main threat later in the evening will be strong wind gusts as the tornado risk diminishes and the storms will fully move out of the region by the early overnight hours.
Isolated thunderstorms are possible across much of Southern Ontario during the afternoon and evening on Tuesday. The exact strength of these storms is currently unclear although it appears that most should remain non-severe. There is a questionable severe risk through parts of Southwestern Ontario, but there are indications that storm development will be further to the north through Central and Eastern Ontario missing out on the prime environment to the south.
Isolated thunderstorms are expected to develop during the day on Monday in parts of Northern Ontario stretching from Kenora through Thunder Bay and up into the Cochrane/Moosonee region. These storms should remain non-severe with heavy rain, strong wind gusts and small hail. The risk will come to an end by the late evening as any lingering storms will quickly weaken and dissipate.
Thunderstorms are currently not expected in the forecasted region on this day.
