With thunderstorms and lightning breaking the Great British Heatwave, which saw the hottest day for seven years recorded - we take a look at how to stay safe during a such weather. The Met Office has issued a Yellow National Severe Weather Warning for thunderstorms and long spells of thundery rain across the UK today and tomorrow. The Chief Forecaster's statement describes thunderstorms continuing to move north across England and Scotland, with some very energetic storms producing frequent lightning.
The weather map on the left reveals where the rain has been falling across the UK this morning while the map on the right shows where the highest number of lightning strikes have been.
Where is the safest place to be during thunderstorms and lightning?
You guessed right - it's in your car.
Can you still be struck by lightning in a car?
Yes - you can still be struck by lightning in your car, but you're protected from it. Contrary to popular belief, the reason for this isn't because cars have rubber tyres which insulate you from the ground.
According to the USA's National Lightning Safety Institute, "Rubber tyres provide no safety from lightning. After all, lightning has traveled for miles through the sky: four or five inches of rubber is no insulation whatsoever. People should safely abandon this machinery and get into a safe shelter."
The reason you're protected in a car during a lightning storm is actually because the car acts like a faraday cage.
How does a Faraday cage protect you from lightning?
Electrical currents are generally carried on the outside of conducting objects. Anything inside the conducting object (the cage) will be protected from the external electrical current. The same holds true for lightning when it strikes metal vehicles - the outer surface carries most of the electricity. Faraday cages are named after the English scientist Michael Faraday, who invented them in 1836.
Are you completely safe from lightning in a car?
You can be - here's how to stay protected in your car during a lighting storm.
A complete metal shield is necessary for full protection - so if you're stranded during a lightning storm, take cover inside a car with the windows wound up.
- Convertibles do not afford sufficient protection, even with the roof closed. A cloth top will not form a complete Faraday cage either and won't be safe.
- Fibreglass bodied cars are not safe as the outside body needs to be conductive to form a Faraday cage and fibreglass is an insulator.
- The person in the car must not be touching any metal object in the car
- Door and window handles, radio dials, CB microphones, steering wheels, and other inside-to-outside metal objects should be left alone during close-in lightning events.
- Small riding mowers and golf buggies are examples of unsafe vehicles.
The USA's National Lightning Safety Institute also recommends pulling off to the side of the road in a safe manner, turning on the hazard lights, turning off the engine, putting your hands in your lap, and waiting out the storm.
However, the official UK Met Office line is that "Ninety per cent of lightning discharges go from cloud to cloud or between parts of the same cloud, never actually reaching the Earth", and "most of the discharges that do strike the ground cause little or no damage or harm."
What happens when struck by lightning in your car?
Recently the The Top Gear team created an experiment to find out what it would be like if you were struck by lightning while in your car. Richard Hammond was hit by 600,000 volts of nature’s finest whilst sitting in a Volkswagen Golf. Watch the video to see exactly what happened…
No sign of any storms near you? Still lucky enough to be enjoying a heatwave? Check our our 7 ways to stay cool in your car this summer instead.