There is a lot of discussion happening on the impact of global warming on climate. While some still are of the opinion Global Warming is an unnecessary myth created by researchers it is fairly obvious earth is warming up. It also appears that the seas are heating up as well.
If one tabulates the most intense cyclones of North Indian Ocean 6 of the 16 most intense cyclones have happened in the last 10 years or so.
So why does this happen, is there a connection between Global Warming and the Indian Sub continent facing more intense cyclones over the last decade or so.
The Nino 3.4 region in the Pacific Ocean which pretty much indicates the ENSO status is showing some clear signs of higher than average temperatures over time.
The same is the case with Nino 3.0 region which is also showing a warmer than average sea surface temperature trend.
It is quite clear the last few years have confirmed the seas are warmer than normal thanks to the global warming.
While it might appear the rise in Sea Surface Temperatures over Pacific is unconnected to the Indian sub-continent, the weather over earth is always interconnected right through the globe. The success of Northeast Monsoon for Tamil Nadu depends on the Siberian High, a high pressure system further north a few thousands kilometres away.
The El Nino type conditions that has been frequently happening over the Pacific seems to create a ripple effect over the Indian Ocean. Both Western and Eastern Indian Ocean seems to be warming up consistently over years. This possibly is providing more frequent intense cyclones over the Indian Ocean Basin.
This article http://indiaclimatedialogue.net/2014/11/03/indian-ocean-warming-curious-case/ also talks about possibly the oceans are absorbing more of the green house gases thereby heating abnormally. All in All a case of global warming playing a crucial role in the Cyclones of Indian sub continent.