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what is lightning

Lightning is a sudden, powerful electrical discharge in the atmosphere that happens when built-up positive and negative charges equalize between clouds, air, or the ground. It heats the surrounding air to tens of thousands of degrees, causing the rapid expansion that produces thunder.

What is lightning?

  • Lightning is a giant spark of electricity that occurs in the atmosphere during a thunderstorm, either within a cloud, between clouds, or between a cloud and the ground.
  • It is an electrostatic discharge that temporarily neutralizes regions of opposite electrical charge in the sky or between sky and Earth.

How does lightning form?

  • Inside a storm cloud, rising and falling air currents cause ice and water droplets to collide, separating electric charges so that parts of the cloud become strongly positive and other parts strongly negative.
  • When the electric field becomes strong enough to overcome air’s insulating properties, a rapid discharge follows a narrow path, creating the visible lightning bolt and equalizing the charges along that path.

Lightning, thunder, and heat

  • A lightning bolt can heat the air to about 30,000 °C (around 54,000 °F), which is several times hotter than the surface of the Sun.
  • This intense heating makes the air expand explosively and then contract, generating the shock wave we hear as thunder a short time after seeing the flash.

Types and impacts of lightning

  • Common types include cloud-to-ground lightning, cloud-to-cloud lightning, and in-cloud lightning, with most flashes actually occurring within or between clouds rather than striking the ground.
  • Lightning can start wildfires, damage infrastructure, and cause injuries or fatalities, especially through direct strikes or dangerous “step potentials” in the ground near a strike point.

Quick safety scoop

  • Lightning can strike miles away from the main rain core of a storm, so if thunder is audible, shelter in a fully enclosed building or metal-topped vehicle is recommended.
  • Staying away from open fields, tall isolated objects, wired electronics, and plumbing during a storm reduces the risk of lightning-related injury.

Information gathered from public forums or data available on the internet and portrayed here.