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Widespread 20-30+ cm of significant snow expected in Ontario

by Rachel Morgan News Editor
written by Rachel Morgan News Editor

A significant winter weather event is forecast for much of Ontario, bringing the potential for heavy snowfall and extremely cold temperatures. Air temperatures expected to fall into the -10s and -20s will contribute to what forecasters describe as “fluffy snow,” which accumulates rapidly and may overwhelm snow removal efforts.

Did You Know? Lake-effect snow forms when cold, dry air passes over relatively warm lake water, picking up moisture and creating intense snowfall bands.

A cold easterly wind originating over Lake Ontario is expected to generate a concentrated band of lake-effect snow. While the exact location of this band remains uncertain, areas from Oakville to Toronto and Pickering are currently considered at risk. The highest snowfall totals – potentially exceeding 20-30 centimeters – and the risk of complete whiteout conditions are expected within this band.

Beyond the immediate lake-effect snow, communities north of Highway 407, including London, Barrie, and areas extending eastward toward Ottawa, could see accumulations of 10-20 centimeters through Monday morning. Any snowfall will likely remain on the ground, as temperatures are forecast to stay below freezing for the remainder of the month.

Expert Insight: The combination of extremely cold temperatures and significant snowfall presents a serious challenge for infrastructure and public safety. Rapid accumulation rates can quickly make travel hazardous and strain snow removal resources.

Looking ahead, next week is predicted to bring frigid conditions, with daytime highs mainly in the minus teens and overnight lows dipping into the -20s. These colder-than-normal temperatures are currently expected to persist into early February. While a brief return to seasonal temperatures is possible around February 5, conditions could shift back to below-normal temperatures by mid-February.

Frequently Asked Questions

What type of snow is expected?

Air temperatures in the -10s and -20s will lead to fluffy snow that accumulates quickly.

Which areas are most at risk from lake-effect snow?

Anywhere from Oakville to Toronto to Pickering is at risk from the band of lake-effect snow, with the highest impacts expected within that area.

How long will the cold temperatures last?

Colder-than-normal temperatures are anticipated to persist into the first few days of February, with a possible return to colder conditions by mid-February.

How will you prepare for the expected winter conditions in your community?

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World

What we know so far about possible Ontario impacts from significant U.S. winter storm

by Chief Editor
written by Chief Editor
Published on Jan. 22, 2026, 1:43 AM

Updated on Jan. 22, 2026, 2:05 AM

A looming winter storm impacting the U.S. is raising concerns about potential snowfall across southern Ontario. This article explores the evolving trends in winter storm patterns, the role of climate change, and how Canadians can prepare for increasingly unpredictable weather.

The Shifting Landscape of Winter Storms in Southern Ontario

The potential for a significant snowfall event in southern Ontario, linked to a major U.S. storm, isn’t an isolated incident. It’s a signal of evolving weather patterns. We’re seeing a trend towards more volatile winter conditions, characterized by intense bursts of snowfall followed by periods of relative calm. This isn’t simply about colder temperatures; it’s about atmospheric instability and how climate change is influencing storm tracks.

Historically, southern Ontario winters were reliably cold and snowy. However, data from Environment and Climate Change Canada shows a clear increase in the frequency of extreme precipitation events – both snowfall and rainfall – over the past two decades. This is consistent with global climate models predicting more energy in the atmosphere, leading to more intense weather systems.

The Polar Vortex and its Erratic Behavior

The buckling of the polar vortex, as recently highlighted, is a key driver of these changes. The polar vortex is a large area of low pressure and cold air surrounding both of the Earth’s poles. When it remains stable, the cold air stays contained. But when it weakens and becomes distorted – often due to disruptions in the jet stream – frigid air masses can plunge southward, bringing extreme cold and the potential for significant snowfall.

Recent research suggests that Arctic amplification – the phenomenon of the Arctic warming at a rate twice as fast as the global average – is contributing to a weaker and more unstable polar vortex. As the Arctic loses sea ice, it absorbs more solar radiation, warming the region and altering atmospheric pressure gradients. This, in turn, influences the jet stream and increases the likelihood of polar vortex disruptions.

Lake-Effect Snow: A Growing Concern

The interplay between these larger weather systems and the Great Lakes is also crucial. Lake-effect snow, already a significant factor in the snowbelts of southern Ontario, is becoming more unpredictable and potentially more intense. Exceptionally cold air flowing over the relatively warmer lake waters creates instability and generates heavy snowfall downwind.

The easterly flow off Lake Ontario, mentioned in the current forecast, is a classic setup for lake-effect snow. However, warmer lake temperatures due to climate change can extend the lake-effect season and potentially increase snowfall totals in localized areas. The GTA, in particular, is vulnerable to these localized bursts.

Beyond Snowfall: The Impact of Extreme Cold

It’s not just about the snow. The extreme cold that often accompanies these storms poses significant risks to human health and infrastructure. Temperatures dropping into the -20s, and even lower with wind chill, can lead to hypothermia and frostbite. Infrastructure, such as power grids and water pipes, is also vulnerable to freezing and damage.

A case study from the 2019 polar vortex event demonstrated the widespread impact of extreme cold, with power outages affecting thousands of homes and businesses across Ontario. The economic costs associated with these events are substantial, including lost productivity, damage to infrastructure, and increased healthcare expenses.

Preparing for the New Normal

Given these evolving trends, proactive preparation is essential. This includes:

  • Staying Informed: Regularly monitor weather forecasts from reliable sources like The Weather Network and Environment Canada.
  • Emergency Kits: Prepare emergency kits with essential supplies such as food, water, blankets, flashlights, and a first-aid kit.
  • Home Preparedness: Ensure your home is properly insulated and that your heating system is functioning efficiently.
  • Community Support: Check on vulnerable neighbours and offer assistance during extreme weather events.

Pro Tip: Consider investing in a generator to provide backup power during outages. Ensure it’s properly ventilated and operated according to manufacturer’s instructions.

FAQ

Q: Is climate change causing more winter storms?
A: Climate change isn’t necessarily *causing* more storms, but it’s increasing the intensity and unpredictability of winter weather events.

Q: What is the polar vortex?
A: The polar vortex is a large area of low pressure and cold air surrounding the Earth’s poles. Disruptions to the polar vortex can lead to extreme cold outbreaks.

Q: How does lake-effect snow form?
A: Lake-effect snow forms when cold, dry air passes over relatively warmer lake waters, creating instability and generating heavy snowfall downwind.

Q: What should I do to prepare for extreme cold?
A: Dress in layers, limit outdoor exposure, and be aware of the signs of hypothermia and frostbite.

Did you know? The Great Lakes hold approximately 21% of the world’s surface freshwater supply, significantly influencing regional weather patterns.

Stay tuned to our website for further updates on this developing storm and ongoing coverage of winter weather trends. Share your winter preparedness tips in the comments below!

Explore more weather forecasts and articles.

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Tech

Environment Canada issues blizzard warnings for parts of Southern Ontario

by Chief Editor
written by Chief Editor

Brace for Impact: Ontario’s Snowstorms and the Future of Extreme Winter Weather

Southern Ontario is bracing for another significant snowfall, with some areas facing potential blizzard conditions. But this isn’t just another winter storm; it’s a stark reminder of a growing trend: increasingly volatile and intense winter weather events. From lake-effect snow squalls to frigid Arctic air, Ontario residents are experiencing the front lines of a changing climate.

The Anatomy of a Lake-Effect Snow Event

The current storm, focused east of Lake Huron and around Lake Erie, is a classic example of lake-effect snow. Cold, dry air moving over relatively warmer lake water picks up moisture. As this air rises and cools, it dumps heavy snowfall on downwind communities. The intensity is amplified by strong westerly winds, creating localized, but significant, accumulations. Environment Canada’s warnings highlight the potential for 20-40cm of snow, with localized higher amounts, and dangerous visibility.

Did you know? Lake-effect snow is responsible for over 80% of the snow in the Great Lakes region, making it a crucial factor in winter weather patterns.

Beyond This Storm: A Pattern of Intensification

While lake-effect snow is a regular occurrence, climate scientists are observing a trend towards more frequent and intense events. Warmer lake temperatures, driven by climate change, provide more moisture to fuel these snowstorms. A 2022 study by the University of Waterloo’s Climate Institute found a clear correlation between rising Great Lakes water temperatures and increased lake-effect snowfall in recent decades. This means communities accustomed to winter weather need to prepare for potentially heavier and more disruptive snowfalls.

The Expanding Reach of Arctic Air

The current system isn’t just about snow. It’s bringing a significant influx of Arctic air, with wind chills expected to plunge to -20 to -25°C. This is part of a larger pattern: a weakening polar vortex. The polar vortex is a large area of low pressure and cold air surrounding both of the Earth’s poles. When it weakens, it can send frigid air masses further south, impacting regions like Ontario.

Recent winters have seen several instances of dramatic “polar vortex breakdowns,” leading to prolonged periods of extreme cold. For example, the winter of 2018-2019 saw record-breaking cold temperatures across much of North America due to a disrupted polar vortex. This trend is expected to continue as the Arctic continues to warm at a rate twice as fast as the global average.

Impacts and Adaptation: From Infrastructure to Public Health

These intensified winter weather events have far-reaching consequences. Infrastructure is strained by heavy snowfall and freezing temperatures, leading to power outages and transportation disruptions. The Niagara region, frequently impacted by lake-effect snow, has invested in upgraded snow removal equipment and power grid resilience measures. However, even with these improvements, the risk of outages remains high.

Public health is also a concern. Extreme cold increases the risk of hypothermia and frostbite, particularly for vulnerable populations. Cities like Toronto are proactively opening warming centres to provide shelter for those in need. (Find a list of Toronto’s warming centres here.)

Looking Ahead: Forecasting and Preparedness

Improving weather forecasting is crucial for mitigating the impacts of extreme winter weather. Environment Canada is continually refining its models to provide more accurate and timely warnings. However, forecasting remains challenging, particularly for localized events like lake-effect snow squalls.

Pro Tip: Stay informed about weather forecasts and warnings through reliable sources like Environment Canada (weather.gc.ca) and local news outlets. Have an emergency kit prepared with essential supplies like food, water, warm clothing, and a flashlight.

The Role of Climate Action

While adaptation measures are essential, addressing the root cause of climate change is paramount. Reducing greenhouse gas emissions is critical to stabilizing the Arctic and mitigating the risk of further disruptions to the polar vortex. Ontario’s commitment to reducing emissions, as outlined in its climate change plan, is a step in the right direction, but more ambitious action is needed.

Frequently Asked Questions (FAQ)

Q: What is a blizzard warning?
A: A blizzard warning is issued when sustained winds of at least 60 km/h and heavy blowing snow are expected to reduce visibility to 400 meters or less for at least four hours.

Q: How can I prepare for a winter storm?
A: Prepare an emergency kit, ensure your home is properly insulated, and have a plan for dealing with power outages.

Q: What should I do during a blizzard?
A: Stay indoors, avoid travel, and check on vulnerable neighbours.

Q: Is climate change causing more extreme weather events?
A: Yes, climate change is increasing the frequency and intensity of many extreme weather events, including winter storms and cold snaps.

This winter’s weather serves as a powerful reminder of the changing climate and the need for proactive preparedness. By understanding the science behind these events and taking steps to adapt, we can minimize the risks and build more resilient communities.

What are your thoughts on the increasing frequency of extreme winter weather? Share your experiences and preparedness tips in the comments below!

Explore more articles on climate change and weather preparedness on our website.

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