The odds of being struck by lightning in Canada are lower than one in a million. Yet each year, six to 12 Canadians are killed by lightning and many more are injured.
A lightning guideline is the "30-30" rule: (http://sirc.ca/resources/weather, SIRC and Environment Canada)
- When you can count 30 seconds or less between lightning and thunder, head for safe shelter
- Remain sheltered for 30 minutes after the last clap of thunder.
When there are fewer than 30 seconds between the flash of lightning and the rumble of thunder, you should seek immediate shelter in a well-constructed building. If no such building is nearby, then the best choice is to get into a hard-topped vehicle such as a car, van or RV. If you are caught outside and cannot quickly get to a building or vehicle, then you should do the following:
- Avoid being the tallest object around;
- Avoid being NEAR the tallest object around (i.e. an isolated tree);
- Avoid being near objects that conduct an electrical charge (metal fence, power lines, golf clubs, fishing rod, etc.);
- Get out of, or off, the water
Maintain lightning safety precautions for 30 minutes after the last flash of lightning or rumble of thunder. There have been a number of documented cases of lightning striking the ground many kilometres away from a thunderstorm, even though the storm may be moving away.
Canadian Lightning Danger Map - Ontario; Government of Canada
Lightning Safety; Environment and Climate, Canada