A recent phenomenon in Chhattisgarh, where the sky turned blood red during Cyclone Arnab, has sparked curiosity about its cause. The explanation lies in the way sunlight interacts with the atmosphere. Sunlight is composed of all colours, but when it travels through a longer stretch of atmosphere, shorter wavelengths like blue and violet are scattered more, while red and orange light pass through more easily, resulting in striking colourful sunsets. During a cyclone, changing atmospheric conditions and increased moisture and airborne particles can influence light scattering, creating red and orange skies. This phenomenon is connected to Rayleigh scattering, which explains why sunsets often appear red. The blood-red sky is not a warning sign, but rather a fascinating demonstration of the science behind light and atmosphere interaction.