Canadians checking the forecast will now see a significant change aimed at making severe weather easier to understand at a glance.
Screenshot: Weather Alerts on Nov 27; Credit: weather.gc.ca
Environment and Climate Change Canada has rolled out a new colour-coded alert system, designed to quickly signal how threatening an incoming weather event may be. The update is part of a broader modernization effort that aligns Canada’s approach with international standards set by the World Meteorological Organization.
What the Alert Colours Mean
Yellow Alerts
Yellow is expected to be the colour Canadians see most often. It signals hazardous weather that may cause damage, disruptions, or health concerns.
Officials describe the expected effects as generally moderate, localized, and short-lived. Examples could include temporary power outages or broken tree branches during a windy spell.
Orange Alerts
Issued less frequently, orange alerts indicate severe conditions likely to cause significant damage or widespread interruption.
Impacts may last several days, and the risks to people and property are noticeably higher than in yellow situations.
In an orange-level wind event, for instance, communities could face widespread outages, snapped trees, and some roof damage.
Red Alerts
The rarest and most serious category, red alerts are reserved for very dangerous, potentially life-threatening weather. These events bring the potential for extensive destruction and long-lasting disruption.
Historical examples that would have qualified as red alerts include the 1998 ice storm in Ontario and Quebec, the 2020 “snowmageddon” in St. John’s, and the 2021 atmospheric river in British Columbia.
How Meteorologists Will Decide
To assign colours, forecasters will use an “Alert Colour Matrix” that merges atmospheric data—such as real-time observations and weather models—with new Impact Guides. These tools help determine what a storm is expected to do, not just what it will be, factoring in local conditions, timing, and population vulnerability.
Multiple alerts can still be issued for the same area, but the system will now display the highest-risk colour first.
Every watch, advisory, and warning issued in Canada will now come with a corresponding colour.
Canadians looking for updates can visit Canada.ca/Weather or use the WeatherCAN app for Android and iOS. The department says additional improvements are planned over the next year, including more context in daily forecasts and extended outlooks for potential extreme weather.