Skies over Hangzhou and nearby areas turned pink and purple on the evening of 11 July, shortly before Typhoon Bavi made landfall, prompting widespread social media posts and video clips.
Some residents said the sky shifted through multiple colors within a short period, with one netizen describing the scene as "Hangzhou—four colors in 20 minutes." Photos and video captured a vivid pink and violet glow across the city's skyline.
This phenomenon is commonly known as a "typhoon glow"—a type of sunset coloration often seen as a sign that a typhoon is approaching.
Moisture and sea-salt particles carried by a typhoon's outer bands can be transported to higher altitudes, forming widespread thin cloud layers. As sunset light passes through a thicker section of the atmosphere, shorter-wavelength blue and violet light is scattered and filtered more strongly, while longer-wavelength red and pink light penetrates and spreads across the clouds, creating a broad pink-toned sky.
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