Environment and Climate Change Canada has launched a new extreme weather alert system that meteorologists say could help reduce “alert fatigue.”
The new system allows forecasters to draw a specific polygon around areas affected by severe weather, rather than issuing warnings across an entire region.
Emergency preparedness meteorologists say the more targeted approach will reduce unnecessary notifications and allow forecasters to track storms in real time, including splitting or merging warning areas and upgrading portions of a storm when needed.
The update applies specifically to severe thunderstorm and tornado warnings. Other alerts, including heat warnings and thunderstorm watches, will continue using broader alert areas.
The system builds on Environment Canada’s colour-coded warning system introduced in November 2025. Yellow alerts indicate potentially hazardous weather with moderate, localized or short-term impacts. Orange alerts signal severe weather that could cause significant, widespread or longer-lasting impacts, while red alerts are reserved for very dangerous, potentially life-threatening weather with extreme and prolonged impacts.
Environment Canada will keep the colour-coded system alongside the new polygon system during a transition period, allowing third-party weather platforms time to adapt. The broader regional system will continue to be used for weather watches.
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