The Red Sky Phenomenon
Cyclone Arnab turned Chhattisgarh's evening sky blood red. The science behind it is beautiful, but so is the warning it carries.
Imagine walking in the evening and the sky above you turns a deep, blood red. You pinch yourself, realising you are not trapped in Hawkins from Stranger Things. This is precisely what residents across Chhattisgarh, from Dhamtari to Bastar, experienced during Cyclone Arnab. While the viral visuals invited otherworldly and superstitious theories, the sky's transformation was an extraordinary wonder of nature, albeit one that demands caution.
The phenomenon is driven by Rayleigh scattering, the exact process that makes our daytime sky appear blue. Earth's atmosphere is filled with gas molecules whose dimensions are far smaller than the wavelength of incoming sunlight. Sunlight consists of a spectrum of colours, but because blue light has a shorter wavelength, it scatters in all directions far more efficiently than other colours; hence the sky appears blue.
At sunrise or sunset, sunlight enters at an angle where it has to travel a significantly longer path through the atmosphere to reach the human eye. Along this extended journey, short blue wavelengths scatter out and dissipate long before reaching us. Consequently, only the longer wavelengths, reds and oranges, cover the distance.
During a severe cyclone, this path becomes denser. Intense storms lift vast amounts of atmospheric moisture and dust high into the troposphere. Rather than creating physical friction, these dense, elevated particles act as a massive screen, scattering away any remaining mid-spectrum light and leaving only the deep red wavelengths.
Yet beneath this captivating spectacle lies a stark warning. In awe of the sky above, we risk ignoring what is brewing beneath. Rising global temperatures and climate change are rapidly warming ocean surface waters. This intense heating fuels deep low-pressure zones, driving increasingly severe cyclones across tropical regions.
The red sky may be a stunning atmospheric display, but it is also a grave reminder of the devastating climate disasters awaiting us.
This is an opinion piece. The views expressed are the author's own and do not necessarily reflect those of The Declaration. Spotted an error? Tell us. Corrections log.