May 13, 2024

Elevated Severe Thunderstorm Risk in Parts of Southern Ontario on Monday

May 13, 2024/ Brennen Perry

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After a damp and somewhat chilly weekend across Southern Ontario, the heat has returned to kick off the week. Many areas in Southwestern Ontario, extending into the Golden Horseshoe and Central Ontario, are expecting daytime highs in the mid-20s on Monday. There's even a slight chance that those in Deep Southwestern Ontario, including Windsor and Chatham, could hit 30°C for the first time this year!

However, this heat will also provide the fuel for some thunderstorm activity during the afternoon and evening hours. Some of these storms have the potential to become severe, with the main threat being large hail up to the size of toonies or ping-pong balls. Marginally severe wind gusts around 90 km/h are also possible, and an isolated tornado cannot be ruled out.

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The threat for severe weather stretches from the Lake Huron shoreline, eastward through the Greater Toronto Area and around the Lake Simcoe area. There could also be some severe storms in Eastern Ontario, especially around the Peterborough, Bancroft, and Tweed regions.

We expect storms will begin to fire sometime between 3 to 6 PM along a line extending from Lake Huron to Bancroft. Keep in mind that these cells will be extremely localized, and most areas may not even see a storm today. However, based on the expected environment, any storms that develop will have the potential to quickly become severe and will likely start producing severe hail, which is the main concern with these pulse-like storms.

Current indications suggest two main clusters of storms will develop, with the first cluster located over Lake Huron and tracking through Huron, Grey, Bruce, Dufferin, and Wellington counties. The other cluster will be located around Kawartha Lake, Halliburton, Peterborough, and Bancroft. These storms will likely weaken as they track further into Eastern Ontario where the environment is less favorable to support severe weather.

By the early evening hours, the cluster of storms east of Lake Huron will continue to mature with all severe threats on the table including very large hail, strong wind gusts, and maybe even an isolated tornado. They are expected to track into Simcoe County and York Region around Lake Simcoe by 6 to 8 PM.

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By the mid to late evening, daylight will begin to fade, reducing the daylight heating that is fueling these storms. They are expected to track into Central Ontario, including Kawartha Lakes and Halliburton, as they gradually weaken once nightfall occurs. We could still see some small hail and strong wind gusts with these storms throughout Eastern Ontario until around midnight.

Non-severe thunderstorms are expected to continue along that same corridor throughout the overnight hours. While we don’t expect any severe threats overnight, flooding could become an issue as multiple rounds of storms train over a particular region.

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May 07, 2024

Severe Storms Could Bring Golf Ball-Sized Hail & Isolated Tornado Risk to Parts of Southwestern Ontario Late Tuesday

May 07, 2024/ Brennen Perry

Are Tornado Tuesdays making a comeback this year in Southern Ontario? It seems that the first full week of May will begin on a stormy note, with a looming severe thunderstorm risk starting Tuesday evening in Deep Southwestern Ontario.

However, the severe threat will be very localized, focusing on Windsor, Amherstburg, Pelee Island, and Leamington. Based on the latest data, the environment in these areas could support the development of storms capable of producing large hail.

Severe wind gusts are also possible, but the main concern is hail, as these storms are expected to be fairly elevated. The hail could be quite large, potentially reaching the size of ping-pong balls or even golf balls.

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Regarding the tornado threat, the elevated nature of these storms should limit the potential for any rotation to reach the surface and produce a tornado.

However, there is a fairly strong environment stateside that could support tornadic activity, and we can’t completely rule out a rogue storm. This is especially true around Leamington and Pelee Island, where the environment is strongest.

Isolated storms are expected to begin popping up over Indiana, Michigan, and Ohio sometime during the late afternoon and early evening. This is where the severe risk will be the strongest, likely leading to several tornadoes and very large hail.

As these storms mature later in the evening, they will track towards Deep Southwestern Ontario around 8 to 11 PM. There is some uncertainty about how well these storms will maintain their strength due to the lack of daylight heating and the cold waters of Lake Erie, which prevent the environment from extending too far north into our region. If the storms arrive earlier than expected, the severe threat could increase, as daylight heating will still be in effect and help fuel the storms.

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Widespread non-severe thunderstorm activity is expected to spread across Southwestern Ontario and into parts of the Golden Horseshoe around midnight. At this point, the storms are not expected to pose any severe threats, but small hail and strong wind gusts cannot be completely ruled out.

Those around Georgian Bay and into Northeastern Ontario, including Sudbury and North Bay, could be awakened by some noisy storms early Wednesday morning. These storms are also expected to remain non-severe.

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April 29, 2024

Severe Thunderstorm Risk to Kick Off the Week in Southwestern Ontario on Monday

April 29, 2024/ Brennen Perry

It has been quite an active few days when it comes to severe weather across the U.S., with a multi-day tornado outbreak leading to devastating scenes in Nebraska, Iowa, and Oklahoma.

Now, the severe weather threat shifts northeast, including the potential for strong storms in Southwestern Ontario starting Monday afternoon and continuing into the evening hours.

Thankfully, the threat here doesn’t appear to be as severe as what was experienced over the weekend in the U.S. However, we could still see damaging wind gusts of 90 to 100 km/h, hail up to the size of quarters, and there's a low chance of an isolated tornado.

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Storms have already started popping up over Michigan as of the early afternoon, and the latest data suggests that the environment is favourable for continued strengthening as they track northeast.

These storms are expected to cross over Lake Huron sometime between 2 to 5 PM and make landfall between Grand Bend and Kincardine. Strong wind gusts and an isolated tornado risk are the main threats with this cluster of storms.

Further south, there may be a second cluster of storms moving into the Windsor area sometime in the early to mid-evening hours. Some models suggest this won’t occur until after sunset, which would lead to a lower severe threat as the effects of daylight heating diminish.

If the storms arrive earlier than expected, the environment would be capable of supporting storms with damaging wind gusts and small hail as the main threats. Again, the tornado risk is low, but we can’t completely rule out a brief spin-up.

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Non-severe thunderstorms will continue throughout the overnight hours into Tuesday morning. This risk extends from Southwestern Ontario through the Golden Horseshoe and into Eastern Ontario along the Lake Ontario shoreline.

April 17, 2024

Severe Thunderstorms Target Parts of Southwestern Ontario on Wednesday With Tornado Threat

April 17, 2024/ Brennen Perry

The saying "April showers bring May flowers" certainly holds true this year in Southern Ontario, where continuous heavy rainfall over the past few weeks has led to flood watches in various parts of Central and Eastern Ontario due to rising water levels.

Even more rain is expected in the coming days. Rainfall totals over the next few days are predicted to range between 10-20mm, potentially reaching 20-40mm in areas affected by thunderstorms.

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This impending rainfall also carries a risk of severe thunderstorms, particularly on Wednesday in Southwestern Ontario, driven by a surge of warm air that could push temperatures into the 20s in some locales.

This increase in temperature will play a crucial role in the development of severe weather conditions starting Wednesday afternoon. However, this will be primarily localized to Deep Southwestern Ontario, including Windsor, Chatham, and Sarnia, limiting the severe threat to these areas. In contrast, temperatures in Central and Eastern Ontario are expected to struggle to reach double digits.

A line of storms has already started forming in Western Michigan, extending from Grand Rapids to Kalamazoo. This line is anticipated to continue its eastward movement, reaching the Canadian border between 3 to 5 PM.

According to the latest data, conditions seem favourable for these storms to potentially become severe, featuring wind gusts over 100 km/h and large hail, possibly the size of ping-pong balls. The chance of a brief tornado cannot be entirely dismissed.

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Environment Canada has issued a severe thunderstorm watch that notably includes potential tornado risks for the following areas:

Chatham-Kent
Eastern Lambton County
Essex County
Komoka
Leamington
Petrolia
Pinery Park
Rodney
Rondeau Park
Sarnia
Shedden
Strathroy
Watford
Western Elgin County
Western Lambton County
Western Middlesex County
Windsor

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As the storm line advances towards London and subsequently the Niagara region by early evening, the severe weather threat is expected to wane due to diminishing environmental support. Nevertheless, isolated wind gusts still could reach 90+ km/h, and small to quarter-sized hail remains a possibility.

While Southwestern Ontario and the Greater Toronto Area might experience a few storms later tonight into early Thursday morning, these are likely to be non-severe.

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April 09, 2024

Severe Thunderstorm & Isolated Tornado Threat on Tuesday for Southern Ontario

April 09, 2024/ Brennen Perry

After experiencing a chilly start to April, Southern Ontario is finally feeling the warmth, bringing a more spring-like atmosphere to the region. This warmth will be especially noticeable on Tuesday as temperatures are expected to climb into the upper teens or even low 20s in some areas.

This warming, combined with an approaching cold front later on Tuesday, will set the stage for the development of thunderstorms.

A potent environment conducive to thunderstorm development is expected to materialize across Southwestern and Central Ontario during the afternoon, fueled by ample daylight heating from the warmer temperatures.

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As the cold front sweeps through the province starting in the late afternoon, a line of storms is anticipated to form, extending from North Bay towards Georgian Bay and into regions east of Lake Huron. According to the latest model data, these storms have the potential to become severe, with all types of severe thunderstorm threats being possible.

A slight severe thunderstorm risk extends from Kitchener through Orangeville and Simcoe County into Central Ontario, with a particular emphasis on the corridor from Orangeville to Bracebridge, where models indicate the most conducive environment for severe storm development. The primary window for these storms is between 3 to 8 PM, varying with the arrival time of the cold front.

These storms could bring large hail, up to the size of quarters or ping pong balls, wind gusts of up to 100 km/h, and the possibility of an isolated tornado cannot be ruled out.

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Areas within the isolated severe risk zone might experience a few storms, but the confidence is lower compared to those within the slight severe zone. As the evening progresses, the risk will evolve into a wind threat as the storms merge into a main squall line, advancing towards the Golden Horseshoe and Eastern Ontario.

In Eastern Ontario, non-severe thunderstorms are anticipated around midnight as the weakening line of storms moves through. Although the severe weather risk is expected to be low by the time the storms arrive, small hail and strong wind gusts are still possibilities.

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For Northeastern Ontario, an isolated severe storm threat is forecasted near the North Bay area as storms develop off Georgian Bay. The severity of the storms is expected to lessen further north, with non-severe thunderstorms predicted for the majority of Northeastern Ontario.

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February 26, 2024

Rare February Severe Thunderstorm Risk for Parts of Southern Ontario on Tuesday

February 26, 2024/ Brennen Perry

As we bid farewell to February, Southern Ontario is set for a wild weather ride, with a rapid-fire succession of seasons in the span of just a few days. This climatic roller coaster is set to take off on Tuesday, bringing an influx of temperatures that are notably higher than what we're used to this time of year. Alongside the warmth, we brace for another hallmark of spring: the threat of thunderstorms.

Looking ahead, we have two distinct thunderstorm risks within a 48-hour window. The early birds in Southern Ontario might be in for a surprise with the first bout of storms expected during Tuesday's morning hours. Coming later in the day, there's the potential for more storm activity that could approach severe levels in the late afternoon and evening.

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As dawn breaks on Tuesday, we expect to see scattered showers and thunderstorms bubble up during the mid to late morning in Southwestern Ontario. Given the environment and minimal energy, these initial storms aren't likely to reach severe thresholds, but they may still pack a punch with lightning, potential for small hail, and strong wind gusts.

These storms will continue to track to the northeast toward Central Ontario and around Georgian Bay, lasting through the morning and into the early afternoon. Throughout the day, a surge of warm air from the southwest will see temperatures soaring into double digits across Southern Ontario.

While everyone across Southern Ontario will feel the heat on Tuesday, the highest temperatures will be found in Deep Southwestern Ontario, affecting locations like Windsor, Chatham, and Sarnia. The extent of this warm spell varies across the different weather models, but don't be shocked if Windsor sees its first 20°C day of the year on Tuesday!

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Progressing into the late afternoon, the escalating heat is likely to stir up atmospheric instability, setting the stage for thunderstorms starting late Tuesday afternoon. These storms are forecasted to pop up to our west, over Michigan and neighbouring states, where a robust environment for severe storms could take shape. However, this forecast remains up in the air, with some of the latest models suggesting storm development could be pushed back to the evening or even overnight which would lead to a lower severe threat.

If storms do materialize, we can't dismiss the possibility of an isolated severe storm tracking into Deep Southwestern Ontario. The primary hazards would be large hailstones, possibly as big as quarters, wind gusts reaching 90 km/h, and heavy downpours. While the tornado risk is not entirely absent, it's expected to remain primarily a concern on the American side of the border.

Another consideration is the lake temperatures this early in the season. While this winter hasn’t been cold by any measure, the lakes are still fairly cold compared to what we would see in the late spring or summer. Colder lakes have a tendency to drain storms of their energy as they cross over the lake and into our region. However, the stretch between Sarnia and Windsor is less shielded by the lakes, leaving it more vulnerable to severe storms crossing the border with little hindrance.

Storms are expected to persist across Southern Ontario into the overnight hours, leading into Wednesday morning. There is a questionable isolated severe risk for the Lake Erie shoreline and into the Niagara region just after midnight that is being picked up by some models.

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Apart from thunderstorms, Tuesday night is shaping up to be unusually mild, rolling into Wednesday morning with temperatures climbing overnight to remain in the double digits for much of Southern Ontario.

But don't be deceived by the unseasonably warm start to your Wednesday. A stark cold front is scheduled to slice through Southern Ontario from the northwest to the southeast beginning late Wednesday morning. This will result in a drastic drop in the temperature from the mid-teens to sub-zero levels in a matter of hours.

The potential for a flash freeze is particularly concerning, especially considering the preceding rain from the storms. Roads are expected to swiftly transition to treacherous sheets of black ice, complicating Wednesday afternoon's commute.

Stay tuned for more comprehensive details on the flash freeze threat, along with an update on the potential for snow as we move into late Wednesday and Thursday.

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February 26, 2024

Weather Whiplash in Ontario With Record-Breaking Heat, Severe Thunderstorm Risk & Flash Freeze This Week

February 26, 2024/ Brennen Perry

Get ready for a wild weather ride, Ontario! The old saying will hold true this week: "If you don't like the weather in Ontario, just wait five minutes—it'll change!" And change it will, with a full spectrum of seasons unfurling over the next 48 hours.

As we previously hinted, a ‘heatwave’ is set to roll in for Tuesday and Wednesday, with temperatures climbing into the teens. Parts of Deep Southwestern Ontario are even teasing the 20°C mark, according to some models!

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Thunderstorms are on the agenda for Tuesday, starting with morning storms and a potential severe risk by the afternoon and evening.

Fog, a recurring theme this season, is slated to make a comeback in certain areas on Tuesday and Wednesday. This will be accompanied by heavy rain, dumping 15-30mm by Wednesday morning. For parts of Northern Ontario, we could be looking at significant snowfall totals as the cold air hangs on there. This includes Kenora, Dryden, Kapuskasing, Cochrane and Timmins.

Take a look at Windsor's 10-day forecast—it's a real temperature roller coaster. We're climbing to the first high on Wednesday with temperatures soaring over 15°C, then taking a dive back to near seasonal norms by Thursday.

But hold on tight! We're heading back up for another warm spell this weekend, with the mercury potentially flirting with the 20°C mark by Monday.

For some perspective, the average high for Windsor at this time of year hovers around 3°C. However, the upcoming forecast anticipates highs that will consistently top the seasonal average. And this pattern of temperature swings? It's set to stick around into the early days of March.

Download our free app to view your local forecast.

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But don't pack away your winter gear just yet!

Remember, it's still February, despite what the balmy temperatures might suggest. Winter is gearing up for a comeback by Wednesday morning and afternoon. A sharp cold front will sweep through the province, one of the steepest we've seen in quite some time, with temperatures plummeting from the teens to below freezing in just a few hours.

Given the expected rain and mixed precipitation during this cooldown, we're likely to see road conditions turn treacherous with ice on Wednesday. A tricky commute is on the cards for Wednesday afternoon, and we can't dismiss the potential for school bus cancellations if the flash freeze risk materializes as the models predict.

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From late Wednesday into Thursday, snow squalls are expected to revisit the usual snowbelt regions, with wind chills plunging to near -20°C—a stark contrast to Tuesday's near-record warmth.

And the temperature roller coaster doesn't stop there. As we look towards the weekend and into early next week, another significant warm-up is on the horizon. Because these rapid temperature fluctuations are definitely healthy for our ecosystem! 🫠

We're putting together a detailed forecast, complete with several maps to navigate this complex weather pattern. It's a bit of a task, so bear with us as we compile all the necessary information. Stay tuned!

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February 24, 2024

Severe Thunderstorm Risk on Tuesday Close to Southwestern Ontario

February 24, 2024/ Brennen Perry

The Storm Prediction Center (SPC) in the United States has identified a 15% severe risk area in their Day 4 thunderstorm outlook for Tuesday, February 27, 2024.

This 15% severe risk zone is approaching Deep Southwestern Ontario, including Windsor. Currently, it stops just shy of Detroit, but the SPC's trend has been to extend it progressively northeast with each new forecast update.

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The SPC's forecast states, “As thunderstorms develop ahead of the front during the late afternoon and early evening, a severe threat is expected from the Ozarks northward into the southern Great Lakes. Wind-damage, and perhaps a few tornadoes would be possible with supercells and/or the stronger bowing line segments.”

Although it's unlikely for the severe threat to cross the border at this stage, the proximity to Windsor will make it something to watch. The potential for an isolated storm, primarily presenting strong wind gusts as a threat, cannot be entirely dismissed.

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Regardless of the severe threat, we're on the cusp of a welcome warm-up, accompanied by a few non-severe thunderstorms expected between Tuesday and Wednesday.

Stay tuned as we continue to monitor the situation and will provide updates as it evolves.

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December 09, 2023

Southern Ontario Basks in Unusually Warm Temperatures With a Rare December Thunderstorm Risk on Saturday and Sunday

December 09, 2023/ Brennen Perry

Don't be surprised if you hear a few rumbles of thunder or catch a glimpse of lightning later today into Sunday morning.

Southern Ontario is currently experiencing an exceptionally warm weekend for December, with numerous areas reporting double-digit temperatures.

The hottest spots in all of Canada are presently Windsor and St. Catharines, both registering a temperature of 14.5 °C as of 12:50 PM on Saturday. Notably, this might set a temperature record for Windsor, considering the highest recorded temperature on this day is 14.4°C from 1946!

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This warmer weather will lead to some instability later today, with scattered thunderstorms developing this afternoon. While the majority of these storms are expected to be relatively weak and not reach severe levels, the latest data suggests a questionable severe risk around Windsor and Chatham during the mid to late afternoon hours today.

An isolated storm could emerge over Michigan and track into the Windsor area in the next few hours. It's highly unlikely for any storms to become severe today, but we believe it's worth mentioning as it can't be entirely ruled out.

The main risks would be strong wind gusts, small hail, and heavy rainfall. Some parts of Southern Ontario could witness between 10-20mm of rainfall by Sunday morning.

This thunderstorm risk will persist to the northeast, affecting the Golden Horseshoe, Central, and Eastern Ontario later this evening and into the overnight hours.

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You might have heard discussions about a significant storm over the last few days for Southern Ontario. We refrained from discussing it earlier, as models were inconsistent. Some models earlier this week suggested a widespread snowstorm with up to 50cm of snow in some parts of our region! However, that is no longer the case.

The latest model data indicates a potential snowmaker tracking up the US Northeast late Sunday into Monday. It seems that accumulating snow will likely miss Southern Ontario, but it's a close call. There's a possibility of heavier snow along the American border in Eastern Ontario (Brockville, Cornwall, etc.), but even that is uncertain.

Some lake-effect snow activity is also possible early this week around Lake Huron and Georgian Bay. We are monitoring the situation and will provide a comprehensive forecast later this weekend if necessary.

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September 07, 2023

Thunderstorm Risk Shifts East on Thursday With Severe Storms Possible in Central Ontario & Ottawa Valley

September 07, 2023/ Brennen Perry

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE WHICH WILL BE EASIER TO READ.

The recent intense heatwave in Southern Ontario is coming to an end, but not without some thunderstorm activity. This has caused a noticeable cooldown in Southwestern Ontario and around the Golden Horseshoe. As a result, Environment Canada has lifted the heat warning for many regions in Southern Ontario. However, part of Eastern Ontario is still experiencing hot weather and the warning remains in place for them for one more day.

Similar to yesterday, relief from the warm temperatures will come in the form of isolated pop-up thunderstorms throughout the afternoon and early evening hours. The focus of this activity will be from just north of the GTA through Lake Simcoe and up into Central Ontario. Later in the day, the Ottawa Valley could also see some storm activity.

While these storms are expected to remain non-severe for the most part, the environment is favourable for a few isolated storms to reach severe levels. The main risks include 90 km/h wind gusts and hail up to the size of quarters. An isolated tornado can’t be ruled out, but the risk is fairly low. If there is a tornado risk, it will likely be highest around the Lake Simcoe and Bancroft area.

The storm risk is expected to come to an end by later this evening. In the wake of the storms, we will see much cooler air flow in overnight with parts of Central Ontario potentially touching the upper single digits by Friday morning. This will set the stage for a much cooler weekend with weather more usual for this time of the year.

September 06, 2023

Severe Thunderstorm Risk Returns to Southern Ontario on Wednesday and Thursday

September 06, 2023/ Brennen Perry

VIEW THURSDAY'S FORECAST HERE

The first full week of September has begun with unusually warm temperatures, bringing some of the hottest weather we've experienced all summer in Southern Ontario. This hot and humid air is a crucial ingredient in thunderstorms, and it will certainly play a significant role over the next two days, with the risk of severe storms returning to our region later this afternoon and again on Thursday.

As of early Wednesday afternoon, we are currently seeing the development of storms over Michigan, which are tracking into Southwestern Ontario. These storms will continue tracking to the northeast, with more pop-up activity anticipated around Georgian Bay by late afternoon. The daylight heating that fuels these storms will begin to wane in the early evening once the sun sets, leading to a gradual weakening in the storm activity around 8 or 9 PM.

For the most part, these storms should remain non-severe; however, we can't rule out the possibility of a few isolated severe storms. The primary concern will be damaging wind gusts exceeding 90 km/h, and there is also a chance of small hail up to the size of dimes along with heavy rainfall. While the tornado risk for all of Southern Ontario is relatively low, we can never entirely dismiss the possibility of an isolated tornado if the right conditions come together.

It's crucial to note that while we have an expansive isolated severe risk, not all areas within the forecast will experience severe weather. The environment is conducive to severe storms, but pinpointing exactly where these storms will occur remains challenging.

Similar dynamics will be in play on Thursday afternoon and evening. The focus of tomorrow's risk will be in Central and Eastern Ontario, although the development of storms is less certain. The storm mode is expected to be more discrete, increasing the potential for hail and tornadoes compared to today.

There are still many uncertainties, so we are awaiting more data before putting together a forecast for the storms on Thursday. Stay tuned for a detailed forecast, which we will provide either later today or early tomorrow.