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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Northern Focus Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
A weather warning is issued by Environment and Climate Change Canada when hazardous conditions—such as heavy snow, freezing rain, or high winds—are imminent or occurring. Knowing what a warning means and how to prepare can keep you safe during severe weather.
What qualifies as a weather warning?
Warnings are the highest level of alert, more urgent than watches or advisories. They are triggered when conditions pose an immediate threat to life, property, or travel. For example, a snowfall warning requires at least 15 cm within 12 hours in most regions, while a wind warning demands sustained speeds of 70 km/h or gusts above 90 km/h. These criteria vary slightly by province and terrain, but the core message remains: take action now.
Which warnings affect Canadians most often?
Winter warnings dominate from November through March, especially across southern Ontario and the Ottawa Valley. Heat warnings are increasingly common in summer months, and severe thunderstorm warnings can strike suddenly from May to September. For current conditions, check Canada weather warnings today—they update every ten minutes during active events.
What’s the difference between a watch and a warning?
A watch means conditions are favourable for severe weather to develop—stay alert. A warning means the hazard is imminent or already happening; you should take protective measures immediately. Watches usually cover a larger area and longer time frame.
How do I get weather warnings for Ottawa or Toronto?
For Ottawa weather warning today, visit weather.gc.ca and select your region. You can also subscribe to free email alerts from Environment Canada or use the Weatheradio Canada service for instant broadcasts. Mobile apps like WeatherCAN provide push notifications for your location.
Are weather warnings issued for Southern Ontario today?
Yes—southern Ontario weather warning today often covers snow squalls, freezing rain, or high winds. Check weather.gc.ca or The Weather Network for local updates. Warnings for this region are typically issued by the Ontario Storm Prediction Centre.