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📘 How does lightning choose its path?

Lightning begins before anyone sees a bolt. Inside a strong thunderstorm, turbulent updrafts move ice crystals, supercooled droplets, and graupel through regions with different temperatures. Collisions transfer charge between the particles,

5
lessons
~25 min
to learn
Adults
level
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What you’ll learn

  1. A storm separates chargeExplain how collisions and motion create separated charge and a strong electric field.A thunderstorm builds the electrical conditions for breakdown.
  2. The stepped leader exploresDescribe branching stepped leaders and upward streamers as competing path-forming channels.The first path is faint, discontinuous, and exploratory.
  3. The return stroke is the flashDistinguish the connected channel from the bright upward return stroke.The visible bolt is the luminous surge after attachment.
  4. One channel can fire againExplain dart leaders, repeated strokes, and lightning types that do not reach ground.A flash can reuse a temporary channel several times.
  5. Read the flash as a sequenceSynthesize charge, field, channel growth, connection, heating, and thunder into one explanation.Lightning's path emerges from an evolving electric field and channel network.

Questions this course answers

What creates the electric field that drives a lightning discharge?

Charge separation creates a voltage difference and electric field.

Put the broad storm process in order.

Collisions and motion build the field before air breakdown.

What is the main role of a stepped leader?

The faint stepped leader develops the channel used by the return stroke.

Match each path feature to its role.

These parts describe how a discharge grows toward connection.

Which process produces most of the visible flash?

The return stroke rapidly heats and illuminates the channel.

Why can lightning look as if it travels downward?

Human vision cannot separate the faint leader from the much brighter return stroke.

Grounded in trusted sources

  • NOAA JetStream, How Lightning Is Created, https://www.noaa.gov/jetstream/lightning/how-lightning-is-created
  • NOAA JetStream, The Lightning Process: Keeping in Step, https://www.noaa.gov/jetstream/lightning/how-lightning-is-created/jetstream-max-lightning-process-keeping-in-step
  • National Weather Service, Understanding Lightning: Negative Flash, https://www.weather.gov/safety/lightning-science-negative-charged-flash
  • National Weather Service, Understanding Lightning: Subsequent Dart Leaders and Return Strokes, https://www.weather.gov/safety/lightning-science-dart-leaders
  • NOAA National Severe Storms Laboratory, Severe Weather 101: Lightning FAQ, https://www.nssl.noaa.gov/education/svrwx101/lightning/faq/
  • UCAR Center for Science Education, Lightning, https://scied.ucar.edu/image/lightning
  • Wikimedia Commons MediaWiki API, https://commons.wikimedia.org/w/api.php

Every Wunder lesson is built from real, reputable sources — never invented.

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