Lightning the 'deadliest summer weather threat' in Canada

It's been atumultuous yearfor thunderstorms.

Big stormshave caused damage across the country this season. Just last weekend, much of southern Ontario wasunder asevere thunderstorm warning. In July, 20,000 Nova Scotia Power customers were left in the darkas lightning strikes fried transformers. That same month, intense thunderstorms swept across the Prairies, causing $48 million in insured damage.

• Scroll to the bottom to see the most common myths surrounding lightning

"It's been a very active year for a summer severe weather point-of-view across all of the Prairies, and specifically in southern Alberta," said Environment Canada meteorologist Brian Proctor.

Alberta is always an active area, andon average gets 400,000 lightning strikes over the summer. Last year there was 358,753 lightning strikes in the province, but this year that number wasup to 576,721 as of Sept. 9.

The number of severe thunderstorm warnings and watches more thandoubledin southernAlberta this summer, and summer stormsfelt like a daily occurrence in Calgary.

• Calgary's July wettest on record in nearly 90 years
• Lightning strikes houses,treesashailstormpounds southern Alberta

The public doesn't always take weather alertsseriously, but Proctor says they should.

"Lightning is by far the deadliest summer weather threat," he said, adding that's followed by flooding, then "straight-line" wind events.

Tornadoes are at the bottom of the fatality list for summer weather events because they are not as frequent. Alberta has one of the most active seasons, and sees on average 10 to 20 tornadoes a season with many not causing damage.

Fatal flashes

"It doesn't have to be a severe storm to potentially kill you, or have impact on you," said Proctor.

"Every thunderstorm or lightning storm by definition is potentially deadly, but we need a super cell thunderstorm to generate tornadoes."

Environment Canada says on average nine to 10 people die in Canada each year because of lightning, and another100 to 150 people are injured.

Proctor saysthat number jumps to 57 fatalities in the United States, with roughly 400 a yearbeing struck by lightning. In an average year, lightning kills about the same number of people as tornadoes and more people than hurricanes.

John Jensenius with theU.S. National Oceanic and Atmospheric Administration (NOAA)told Environment Canada'sCanadianLightningDetection Network that"2016 now ranks as the deadliest year for lightningsince 2007."

The NOAA tracks lightning fatalities across the States, but deaths in Canada are a little trickier to find.

Lyn Mainwaring with the Canadian Lightning Detection Network says she collects as much data as she can, but she says hospitals often classify deaths as a heart stoppage or electrocution.

Public health organizations, like Alberta Health Services, also don't keep track of the number of injuries or deaths from lightning instead pointing to the office of the Chief Medical Examiner.CBC's request for information fromHealth Canada did not get a reply.

There were several people injured in Alberta this year. Proctor says that includesa group of roofers in Calgary and a member of an Edmonton paving crew who sought shelter under a tree (more on why that's bad later on).

Environment Canada does collect historical stories of lightning victims, which you can read at length on its website.

Let me count the ways...

Environment Canada's adviceis,"When thunderroars, goindoors."

The national weather agency even provides a lightning danger mapthat represents the areas most likely to see lightning in the next 10 minutes.

That's because there aremany ways thatlightning can kill you, and with an average of two million lightning strikes in Canada each year, there are plenty of chances.

Environment Canadasays that a direct hit from lightning is responsible for only a small percentage of injuries. There are also ground currents, side flashes, being in contact with an object struck by lightning, upward leaders orstreamers and shockwaves.

"Research shows that a lightning strike that hits the ground is hazardous out to 10 metres," saysEnvironment Canada on its website, whichexplains each type of danger.

"Some people have been injured 15 to 30 metres away from where a lightning strike has hit the ground."

That's because of shockwaveson the ground that can throw a person up to two meters, andbecause of blunt trauma fromfalling objects, fires andexplosions.

Ever heard of surface arc? That's another concern.

"Ultimately, it is two types of lightning strikes (ground current and side flash) that account for 60 to 80 per cent of all the lightning strikes that see people being killed or injured," says Environment Canada.

Fact or fiction?

One of the most common conceptions is that rubber tires will save you from lightning, which Environment Canada saysis untrue. It's actually the steel cage of your vehicle that protects you from the current (another reason toskip that convertible ride in a storm) because it provides a pathway for the charge to flow around the vehicle into the ground.

Proctor says that's actually a problem now for many farmers, as tractors and other large farm equipment traditionally made out of steel arebeing replaced withmaterials like fibreglass and plastic.

Don't stand under a tree in a storm. Insteadseek shelter in a structure that hasplumbing(as ithelps dissipate the charge into the ground).

If you're in a field or camping, and have no access to shelter, Proctor suggests youget low with yourfeet close together, crouching on the balls of your feet, with your hands tucked behind your head.

Here are some of the other most common myths surrounding thunderstorms from Environment Canada:

• Rubber bootswon't save you:Rubber-soled shoes and rubber tires provide no protection from lightning. The lightning strike between the cloud and the ground has potentially travelled thousands of meters through thin air, therefore rubber soled footwear or tires are inconsequential.
• If it's not raining, there is no danger:Lightning often strikes outside of heavy rain and may occur more than 16 kilometres away from a storm. If you can hear thunder, you are at risk of being struck by lightning and should take shelter immediately.Remain sheltered for at least 30 minutes after the last rumble of thunder.
• People struck by lightning carry an electrical charge:Lightning-strike victims carrynoelectrical charge and thereforecanand shouldbeattended to immediately.
• "Heatlightning" occurs after hot summer days and is not a threat:"Heatlightning" is actually just lightning from a thunderstorm that is too far away for thunder to be heard. However, it does mean that the storm may be moving in your direction.
• Blue skies mean no threat: If you hear thunder, then the lightning is close enough to pose an immediate threat.
• Being indoors guarantees your safety:Stay away from electrical appliances that means your computer, TV or gaming console ifplugged inand equipment, doors, windows, fireplacesand anything else that will conduct electricity, such as sinks, tubs and showers.Only use a corded telephone in an emergency.