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Indonesia’s ‘Rainbow Clouds’ Are Real, Weather Agency Confirms

Experts call the display cloud iridescence caused by uniform droplets bending sunlight near the sun.

Overview

  • Videos from West Java showed pastel bands on cloud tops over Jonggol in Bogor and nearby Bekasi, and the clips drew massive attention on social media.
  • Indonesia’s BMKG said the footage is genuine and natural and rejected claims that the images were generated by AI.
  • Meteorologists explained that the colors form when sunlight diffracts through very small, nearly identical water droplets or ice crystals in thin clouds.
  • Analyses linked the scene to a smooth pileus cap sitting over a rapidly growing thunderstorm cloud, a setup that often makes iridescence vivid at certain sun angles.
  • BMKG noted the sight signals growing convective clouds and a chance of local rain rather than an imminent severe storm, and observers were urged not to look near the sun to view it.