Definition 1 of 2
Definition
A sudden, high-energy electrical discharge that occurs within a thunderstorm cloud, between clouds, or between a cloud and the ground. It results from the buildup and rapid release of opposing electrical charges generated by strong updrafts and the interaction of ice particles, water droplets, and hail inside a convective cloud.
Plain English
A powerful spark of electricity released by a thunderstorm. The storm builds up an electrical charge as air, ice, and water churn around inside it, and lightning is how that charge suddenly escapes.
Context Anchor
Seen in thunderstorm discussions, weather briefings, radar and visual weather avoidance, and in-flight decisions about staying clear of convective weather.
Derivation
From Old English 'leoht', meaning light. The word reflects the brilliant flash seen when the discharge heats the surrounding air to extreme temperatures.
Why Pilots Care
Lightning indicates severe thunderstorm activity that must be avoided; strikes can damage aircraft systems or ignite fuel vapors.
Grounding Statement
If you see lightning near your route, picture an active thunderstorm area that needs to be avoided, not just a flash of light in the distance.
Intuition Check
Do not treat lightning as only a visibility issue or as harmless because the flash looks far away. In aviation, lightning means an active thunderstorm is present, and the dangerous air around that storm can extend beyond the flash itself.
Example Sentence 1
The pilot diverted twenty miles south after seeing repeated lightning flashes in the buildups ahead.
Example Sentence 2
Frequent lightning near the airport confirmed the thunderstorm was still active.