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 Sometimes the sky displays a breathtaking spectacle where a rainbow appears to stretch across the clouds like a streak of fire. This rare phenomenon is often called a “ fire rainbow .”  This rare phenomenon, often called a fire rainbow , is actually a scientific event known as a circumhorizontal arc . Nature produces many mysterious phenomena, from the blue fire volcano at night to the strange river flowing beneath the ocean . Despite its dramatic appearance, this glowing arc is not actually fire, and it isn’t a true rainbow either. It is a fascinating atmospheric optical effect known as a circumhorizontal arc . What Is a “Fire Rainbow”? A fire rainbow, scientifically called a circumhorizontal arc , is an atmospheric phenomenon created when sunlight passes through ice crystals in high-altitude clouds. These arcs appear as bright bands of color that run parallel to the horizon and often resemble flames spreading across the sky. Although the name suggests otherwise, th...