If one day you look up at the sky and see clouds painted with rainbow-like colors, don't immediately assume it's an illusion, because this is a genuine natural phenomenon called " Iridescent Clouds ", one of the atmospheric light phenomena that is beautiful and seldom seen.
Though they resemble a rainbow, iridescent clouds form through a different mechanism and are another natural wonder that meteorologists find very interesting.
Iridescent Clouds or "Iridescent Pileus Clouds" (English: Iridescent Pileus Cloud) are a phenomenon where clouds display multiple rainbow-like shades such as pink, green, blue, yellow, or purple spread across their surface, usually near the sun.
The main cause is " diffraction of light " when sunlight passes through very small water droplets or similarly sized ice crystals within the cloud. The different colors of light spread apart, creating rainbow hues on the clouds as seen from the ground.
Iridescent clouds usually appear when there are thin, translucent clouds near the sun's position, which can happen in the morning, afternoon, or evening.
Meteorologists have found this phenomenon often occurs with certain thin clouds like cirrus, altocumulus, or newly forming clouds because they contain many similarly sized water droplets or ice crystals — key conditions for rainbow colors to appear on clouds.
The colors seen are not the clouds' own colors but are sunlight separated into different wavelengths. When white sunlight passes through tiny water droplets or ice crystals, each color bends differently, splitting light into red, orange, yellow, green, blue, indigo, and violet—similar to the colors on soap bubbles or oil slicks—making the clouds appear beautifully rainbow-colored.
Scientifically, iridescent clouds are simply a light phenomenon explained by physics principles of diffraction and light scattering. However, in many cultures, " iridescent clouds " are seen as symbols of good luck, hope, or positive omens because they are beautiful and rarely observed.
Some believe they signal positive changes, and those who happen to look up and see this phenomenon are thought to encounter good fortune. Yet, these beliefs are personal and lack direct scientific evidence.Nevertheless,iridescent clouds
demonstrate how nature can create beauty through complex scientific principles. Simply sunlight, water droplets, and the right viewing angle can transform ordinary clouds into a spectacular sky display. If one day you notice unusually colored clouds near the sun, pause and look closely because you might be witnessing one of the most beautiful natural phenomena in the sky: " Iridescent Clouds
" itself.