How to prevent lightning disaster in strong convective weather season？ A set of hand-drawn animation tells you!

CCTV News:With the arrival of summer, strong convective weather is frequent, and lightning disasters also need attention. So how is the lightning disaster produced and how to prevent it? Let’s get to know the relevant knowledge through a set of hand-drawn animations.

Lightning is an ultra-long distance discharge process in the atmosphere. Lightning has powerful current, scorching high temperature, strong electromagnetic radiation and violent shock wave, which makes it instantly become a "wreck-it ralph", causing lightning disasters. Cloud — Lightning, that is, when there is a discharge between the cloud and the earth, will have a great impact on human activities. Lightning strike can also change into a pattern, and it can be attacked by direct lightning strike, contact voltage, side lightning strike and step voltage. Lightning electromagnetic radiation may also interfere with and destroy the computer system and its data storage.

How do I know how far this dangerous lightning is from me?

Lightning and thunder were born at the same time, but they didn’t run as fast. Light can travel about 300,000 kilometers per second, while sound can only travel about 340 meters per second. Therefore, if you see lightning and hear thunder every 10 seconds, this thunderstorm is about three or four kilometers away.

If you are not sure of the time, you can also listen to the sound to feel it. When the lightning is close, it hears a sharp crack, and when it is far away, it is a rumbling sound. Generally speaking, if thunder can be heard, it will be within 10 kilometers. When encountering lightning weather, it is best not to use the solar water heater on the roof again, because water can conduct electricity and there is a hidden danger of lightning strike.

If you can’t find a suitable and safe lightning protection place outdoors for a while, you can try to squat down, bow your head, put your feet together and tuck your knees in your hands to avoid the "step voltage" damage caused by lightning. Because, when lightning is released from the cloud to the earth, it will produce a potential field, and the closer it is to the lightning point on the ground, the higher the potential is. If the site potentials of the two feet are different when lightning strikes, this potential difference will generate a voltage between the two feet and a current will pass through. The greater the distance between the feet, the greater the step voltage.

As the saying goes: it is not advisable to get off the bus to avoid the rain, and the car entertainment should be closed; All the windows should be closed tightly, and it can’t ride a bicycle or motorcycle; Don’t walk too high with an umbrella, and remove all metal ornaments; If lightning and thunder are similar, squat down and tuck your head to avoid.