Thunderstorms, lightning, heavy rain and hail

Learn about storms and ways you can protect yourself and your loved ones.


Thunderstorms, lightning, heavy rain and hail can develop quickly and threaten life and property. Severe storms occur frequently across Alberta and can be unpredictable.


All thunderstorms are potentially deadly electrical storms, whether or not there is a severe weather warning in effect. Severe weather can bring damaging conditions such as strong winds, hail, lightning, heavy rain and tornadoes.

  • A series of thunderstorms can last for several hours.
  • Severe thunderstorms or heavy winds cause the most damage in Alberta, not tornadoes.
  • Thunderstorms can bring hazards such as heavy rain, lightning and hail.

What to do before and during

  • Before a thunderstorm, pay attention to local news and weather reports for up to date information on thunderstorm conditions, weather warnings and storm maps.
  • Secure loose objects outdoors in case of strong wind and cover your vehicle in case of hail.
  • During a thunderstorm, move to a safe place that is away from windows and doors. Avoid using electrical equipment and telephones.


Each year lightning kills approximately 10 Canadians and injures many more. On average, lightning causes more fatalities in Canada than hail, rain, flooding, wind, tornadoes and hurricanes combined.

What to do before and during

If you can see lightning or hear thunder:

  • Consider it a threat.
  • Seek shelter in a fully enclosed building with wiring and plumbing.
  • Unplug electrical appliances and stay away from outlets.
  • Avoid windows, doors, fireplaces, sinks, tubs and showers because these areas are more likely to pass electricity.
  • Wait 30 minutes after you hear the last rumble of thunder before going outside.

If stranded outdoors:

  • Avoid standing near tall objects or anything made of metal.
  • Avoid water and take shelter in a low-lying area, such as a ditch.
  • If you are out on a lake or other body of water, make way for shore immediately and then follow the instructions above.
  • If possible, avoid sheltering in your vehicle. It does not offer significant protection from lightning.

Heavy rain

Heavy rainfall can cause floods in a short period of time, especially when the ground is frozen or already wet. A heavy downpour warning is issued when 50 mm or more of rain is expected within one hour.

What to do before and during

Before heavy rainfall:

  • Check the drainage around your home to see if there is any possibility of your basement flooding.
  • Take preventative measures such as grading your property so water does not collect or flow towards your home.
  • Ensure you have reliable drainage or a working sump pump in your basement.

If outdoors during heavy rainfall:

  • Avoid roadway underpasses, drainage ditches, low lying and water collection areas. These areas can flood and overflow very quickly.
  • Stay away from power lines and electrical wires.


Hail forms in storm clouds and is most common in summer, but can also occur during colder times of the year. Hailstones range in size, from small peas to grapefruits, with large hail occurring more in the warmer season.

  • Hailstones can fall at speeds of up to 100 km/h or more, and can cause significant damage to homes, property, cars and crops.
  • When combined with heavy rains, hail can clog storm drains leading to flooding.

What to do before and during

  • Immediately take cover when hail begins to fall.
  • Keep yourself and your loved ones away from windows, glass doors and skylights.
  • If outdoors and there is no shelter close by, crouch down with your face away from the wind. Protect your neck with your hands.

Financial preparedness

  • Speak to an insurance agent about your specific needs.
  • Know your insurance options and policy limits. Make sure your home, vehicle, business and belongings are protected. Talk to your insurance agent to learn about what is not covered in your insurance policy.
  • If possible, consider an emergency savings account to cover temporary expenses while you are out of your home.
  • If you can, keep emergency cash handy in case banking services are unavailable.
  • If you are evacuated, keep all receipts for additional expenses.
  • Prepare a detailed list of all your belongings. For more information, see Home Inventory.
  • Know the 7 steps for making a home insurance claim. For more information, see Claims Management.
  • The Disaster Recovery Program may provide assistance for uninsurable loss and damage.

Staying informed

Staying informed during emergencies can save your life. Protect yourself and your loved ones by downloading the Alberta Emergency Alert app to receive critical, life-saving alerts.

You can also find out more information by contacting your community directly to find out where they post updated information during emergencies.

Before you travel, check Alberta 511 for current road conditions to help you arrive to your destination safely.

Helping others

Check with your community to learn how to help others during severe weather events. If you’re concerned for someone’s safety, call:

  • 211 if someone is in distress or in an unsafe place
  • 911 if they’re unconscious or need medical help

Resources and translations

Education material you can read, print and download to share online and within your community. Translated versions are also available in українською (Ukrainian), عربي (Arabic), 简体中文 (Simplified Chinese), 繁體中文 (Traditional Chinese), ਪੰਜਾਬੀ (Punjabi), Deutsch (High German), Plautdietsch (Low German), Español (Spanish), Français (French) and Tagalog (Tagalog).



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Connect with the Alberta Emergency Management Agency:

Hours: 8:15 am to 4:30 pm (open Monday to Friday, closed statutory holidays)
Phone: 780-422-9000
Toll free: 310-0000 before the phone number (in Alberta)
Email: [email protected]