Violent Thunderstorm Alert Across Quebec: Dangerous Weather Hits Hard This Sunday
As I speak right now, all eyes in southern Quebec should be turning to the sky—and not with optimism. We are currently under an official alert for violent thunderstorms , and the forecast paints a serious and unsettling picture for this Sunday. We're not just talking about rain showers or a breezy summer storm. This system carries with it the full force of nature: powerful wind gusts, hail, flooding rains, and even the slight possibility of tornado activity .
It all starts with an intense mix of extreme heat and suffocating humidity. For the third consecutive day, temperatures across the southern part of Quebec—including cities like Montreal, Gatineau, Sherbrooke, and even as far north as Saguenay—are soaring past 30°C, with humidex values making it feel like over 40°C. That level of heat and moisture? It’s pure fuel for thunderstorms.
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And that fuel is about to ignite. A cold front is sweeping west to east across the province, acting like a spark in this unstable atmosphere. When cold, dense air pushes against the hot, humid air mass already in place, it forces that warm air to rise rapidly. This process—called convection—is what leads to frontal thunderstorms. And unlike their scattered, summer-storm counterparts, these are more violent, better organized, and highly capable of causing damage .
Regions along the Saint-Lawrence Valley, from Montérégie up to Quebec City, are at high risk. The Outaouais, Saguenay, and Charlevoix regions are also under watch. Areas west of Lac Saint-Jean and La Tuque were the first to be placed under warning around midday, and now it’s spreading. Winds could reach up to 90 km/h, large hail is a real threat, and the rain? It could fall in torrents—overwhelming drainage systems and causing flash floods .
Environment Canada strongly advises against any outdoor or water activities this afternoon and evening. The suddenness and severity of the winds on lakes and rivers could make boating or swimming highly dangerous. In fact, there’s already been a dramatic incident where pressure from overloaded sewers caused a street to erupt violently—underscoring the seriousness of flash flooding in urban areas.
Let’s also not forget another invisible danger today: smoke from wildfires in western Canada is being carried into parts of northern Quebec and Abitibi-Témiscamingue. A special air quality statement is in effect for those areas, adding respiratory risks to an already hazardous weather day.
As we move through the evening, storms are expected to ease by late night—but the heat wave continues. Temperatures over 30°C are expected to persist at least through midweek in Montreal and surrounding regions.
So please, take this alert seriously. Stay indoors, monitor updates, and check in on vulnerable family members and neighbors. Weather like this isn’t just inconvenient—it can be life-threatening. Let’s all stay safe, stay cool, and ride out this turbulent Sunday together.
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