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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Scope Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
If a weather warning is active for your area, modify plans and stay indoors if possible. These official alerts mean hazardous conditions—such as heavy snow, freezing rain, or extreme wind—are occurring or imminent, and Environment and Climate Change Canada issues them to protect life and property.
What defines a weather warning?
A weather warning is the highest level of alert from Environment and Climate Change Canada. It signals that dangerous weather is happening or expected shortly. Unlike a watch (which means conditions are possible), a warning demands immediate attention. Practical takeaway: check your local forecast on the Canada weather hub and follow the recommended safety steps for the specific hazard.
How do warnings differ from watches and advisories?
Watches indicate conditions are favourable for severe weather but not certain; advisories are for less severe events that still cause inconvenience. A warning, however, means the danger is confirmed. For example, a Canada weather warnings page will show active warnings for your region, including weather warning Toronto and Ottawa weather warning today updates. Always treat a warning as immediate action needed.
What is the difference between a warning and a watch?
A watch means severe weather might develop; a warning means it is happening or about to happen. For example, a tornado watch advises preparation, while a tornado warning requires immediate shelter. Always act on warnings without delay.
How often are weather warnings updated?
Warnings are updated whenever the forecast changes significantly or new information arrives. For southern Ontario weather warning today and ontario weather warnings today, Environment Canada issues revisions as storms evolve. Check frequently if you are in the affected zone.
Are weather warnings issued for winter storms only?
No. Warnings cover all severe hazards—thunderstorms, tornadoes, blizzards, freezing rain, extreme heat, and more. Each has specific criteria. For instance, warning ottawa and weather warning today for heat waves are common in summer. Always know the hazard type.