Thunderstorms

Thunderstorms can move very quickly and can cause severe damage. They may also cause wildfires and prolonged power outages. Thunderstorms often include high winds, lightning, and heavy rain. In certain conditions, thunderstorms can also produce hail, downbursts, and even tornadoes. Thunderstorms are typically a single cell with a life cycle of about an hour, but some supercell storms can last for hours. Every region of Canada is vulnerable to thunderstorms and lightning, but the regions of Canada most affected by thunderstorms are the Prairies, southern Ontario and southern Quebec.

Why prepare for thunderstorms

Thunderstorms and lightning can pose a risk to people and property. The May 21, 2022, derecho (a widespread, long-lived wind storm) in southern Ontario and western Quebec killed eleven people and caused over $1 billion worth of damages. Two other thunderstorms have caused over $1 billion worth of damages, making thunderstorms the cause of some of Canada's most expensive disasters.

What to do

Where to start

You can protect members of your household by learning more about thunderstorms and taking precautions to ensure your household is prepared.

• Prepare your emergency kit. Learn more about what items to put in your kit, including quick and easy steps you can take right away
• Make a household emergency plan. Consider the specific needs of all members of your household, including older adults, children, pets, and anyone with special health needs

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