Episode
113 - Reading the Sky: What Storm Colors Are Telling You
- Podcast
- Buzz Blossom & Squeak
- Published
- May 14, 2026
- Duration seconds
- 2272
- Processing state
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Summary
Why does the sky turn green when a tornado is coming? Why do storm clouds go black? And what does a 19th-century volcanic eruption in Indonesia have to do with one of the most famous paintings in the world? In this episode of Buzz, Blossom & Squeak, we finish our spectrometry series by bringing it closest to home — reading the colors of the sky itself, and learning what they’re telling us. The Blue Sky: Our Baseline A clear blue sky is the result of Rayleigh scattering — a process identified by British physicist Lord Rayleigh in the 19th century. Sunlight traveling through the nitrogen and oxygen molecules of the atmosphere scatters the short blue wavelengths far more powerfully than the long red ones. The result: blue light bounces in every direction, filling the sky, while red and orange travel a more direct path. Our eyes also favor blue over violet, which is why the sky appears blue rather than purple even though violet wavelengths exist. Sunsets, Sunrises, and the Long Path Through Air At sunset, the sun’s light must travel at a much longer diagonal through the atmosphere before reaching our eyes — roughly 30 times more atmosphere than when it’s directly overhead. That means more scattering. Blue goes first. Then green. Only the warm wavelengths survive: orange, crimson, deep red, pink, gold. Every sunset is Rayleigh scattering happening live. Krakatoa, “The Scream,” and Volcanic Purple When Krakatoa erupted in 1883 — one of the most violent volcanic events in recorded history — it injected billions of tons of sulfuric material into the upper atmosphere. For months afterward, sunsets around the world turned extraordinary shades of blood red, violet, and even green. In London, people thought it was a fire on the horizon. Fire departments were dispatched. And in…