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📘 The sky flashes before it speaks

Watch from shelter: the white flash arrives, and only later does the window shake. That delay is the first clue.

3
lessons
~15 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. At the flashExplain how a lightning channel heats air and launches the pressure wave called thunder.Thunder begins with explosive heating and expansion along an extended lightning channel.
  2. The sound spreadsDescribe why different parts of a flash arrive at different times and how air reshapes the sound.Distance, absorption, reflections, wind, and temperature layers turn one shock wave into a rumble.
  3. What the rumble tells youUse thunder's timing and texture as rough clues while applying safe storm behavior.A crack or rumble contains information about distance and path, but hearing thunder is a reason to stay sheltered.

Questions this course answers

What creates the initial thunder shock wave?

The lightning channel heats air so quickly that it expands and compresses surrounding air.

Why can one lightning flash make a long sound?

Each part of the extended channel sends a pressure wave that can arrive at a different time.

Why does distant thunder sound lower and more rumbling?

Distance filters out sharper high-frequency components faster than deeper ones.

What can make thunder carry or sound unusually loud?

A warm layer above cool air can bend sound waves back toward the surface.

What is a safe use of the flash-to-thunder delay?

The delay gives a rough distance, but hearing thunder means you should already be in a safe place.

Grounded in trusted sources

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