The thunderstorm forecast is issued daily from April 1 to September 30.

The thunderstorm forecast has ended for the season and will resume on April 1, 2021.

To learn more about the terms used in the thunderstorm outlook, visit our glossary.

 

In Canada, there are two types of severe thunderstorm alerts. Severe thunderstorm watches and severe thunderstorm warnings.

A watch is issued when: conditions are favourable for the development of severe thunderstorms with one wind gusts of 90 km/h or greater, which could cause structural wind damage; hail of two centimetres (cm) or larger in diameter; or heavy rainfall, as per rainfall criteria, excluding those for winter and during thaw.

A warning is issued when: there is evidence-based on radar, satellite pictures, or from a reliable spotter that any one or more of the following three weather conditions is imminent or occurring: wind gusts of 90 km/h or greater, which could cause structural wind damage; hail of two centimetres (cm) or larger in diameter; or heavy rainfall, as per rainfall criteria, excluding those for winter and during thaw.

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