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⚡ How lightning forms and strikes

Follow charge separation inside thunderstorms, the hidden leaders and brilliant return strokes of a flash, the many forms lightning can take, and why current spreads beyond the visible bolt.

4
lessons
~20 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Charge builds inside a stormExplain how turbulent ice and water particles separate charge inside a thunderstorm.Storm updrafts and collisions sort charge into regions, creating the electric field that can overcome air's insulating properties.
  2. Leaders find a pathTrace a typical cloud-to-ground flash from stepped leader to return stroke and repeated strokes.A faint branching leader prepares a channel, a streamer completes the connection, and the bright return stroke travels upward through it.
  3. Lightning comes in formsDistinguish cloud, ground, volcanic, and upper-atmosphere lightning phenomena.Lightning is a family of discharges whose paths and environments range from intracloud channels to sprites and eruption plumes.
  4. Why strikes reach the surfaceExplain why lightning reaches some objects and how current creates thunder and secondary hazards.Ground charge, object geometry, side flashes, ground current, conduction, rapid heating, and sound reveal why a strike is more than one visible bolt.

Questions this course answers

What creates the electric field that allows lightning to form?

Collisions and airflow sort charge into regions, strengthening an electric field until air can no longer insulate it.

What is the bright return stroke?

The return stroke follows the completed leader-streamer connection and produces most of the visible flash.

Which event occurs above a thunderstorm?

Sprites are transient luminous events in the upper atmosphere, often triggered by powerful positive cloud-to-ground strokes.

Why is standing under a nearby tree unsafe during lightning?

Current can jump from a struck tree or spread outward through the ground, so a tree is not substantial shelter.

Grounded in trusted sources

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