Hazards in Manitoba

Thunderstorms


Understanding a thunderstorm

Thunderstorms are a common occurrence in Manitoba. They are caused by a combination of warm, most air rising into the atmosphere and cooler air sinking down. Thunderstorms can bring the potential for lightning, heavy rain, hail, high winds, and the occasional tornado.


Thunderstorms are often accompanied by dark clouds and lightning and can pose unexpected risks. While they may be more common in certain regions, thunderstorms can strike anywhere.

Stay Informed:

  • Maintain awareness by monitoring information shared by your local authority.
  • Stay informed about weather conditions.

Planning and education:

Property protection strategies:

  • Check with your insurance company for thunderstorm related coverage.
  • Cover your vehicle to prevent hail damage.
  • Check your home's drainage for flooding risks. Visit our what to do before a flood webpage for more information.

Review the Natural Disaster Preparation Residential Checklist for more tips on how to protect your home.


Destructive hailstorm:

On July 14, 2017, a severe thunderstorm accompanied by large hailstones hit parts of southwestern Manitoba. The hailstones, some as large as golf balls, caused significant damage to crop, particularly in the agricultural sector. The storm also brought heavy rain and high winds.


In the middle of a severe thunderstorm, quick and informed action is essential. Whether at home, outdoors, or in various structures, identifying safe shelters and understanding location-specific safety measures is critical.

Stay Informed:

  • Listen to local radio, television, or other official news sources.
  • Pay close attention to updates and warnings.
  • Be prepared to evacuate or shelter in place at any time. Have your Emergency Go Kits or Home Emergency Supplies on hand.

Health and Safety:

    • In all thunderstorms:
      • Follow instructions from your local authority.
      • Move to a safe place away from windows, doors, fireplaces, sinks, bathtubs, and showers.
      • Avoid using electrical appliances and telephones during the storm.
      • Prepare for potential hazards, such as flooding or power outages.
      • Ensure the safety of your pets and any livestock.
    • If lightning is present:
      • Find shelter in a fully enclosed building with wiring and plumbing. These items can ground the lighting.
      • If you are driving, roll up the windows, stop the car, and sit with your hands in your lap. Do not touch any part of the metal fame or wired devices, including the steering wheel.
    • If heavy rain is present:
      • If you are driving, turn on your headlights, reduce the speed, and keep a safe distance from the vehicle in front of you.
    • If hail is present:
      • Cover your head and upper body when hail begins to fall.
      • If you are driving, stay inside your car. Look for a parking lot, gas station, or any covered area.

30-30 Rule

To estimate the distance of lightning, count the seconds between the flash and the clap of thunder. Each second is about 300 meters. If you count less than 30 seconds, take cover.


After a thunderstorm, caution is essential. The aftermath may present unpredictable hazards that require careful consideration. Stay away from potential hazards. Wear appropriate clean-up gear and wait for official safety advisories before entering damaged areas.

Stay Alert:

  • Stay calm and watch for road hazards, such as debris, downed trees, or downed power lines.
  • Wait for official authorization before re-entering the affected area.

Property evaluation:

  • Work with local authorities and professionals to evaluate the safety of your home.
  • Re-enter with caution and be aware of potential hazards.
  • Avoid touching downed power lines and report them to Manitoba Hydro (Downed power lines (hydro.mb.ca)).

Future preparation:

Recovery and financial assistance:

  • Check with your insurance provider first. Coverage is widely available.
  • Evaluate your property damage carefully, documenting with photographs.
  • Review the Financial Assistance section of this website to see if you are eligible.
  • Continue to follow the instructions of local authorities.

Additional Resources