India, Oct. 19 -- The unseasonal downpour last week has left a trail of death and destruction in Kerala, but a closer look at the weather condition in the state shows that there is a clear shift in rain pattern in the last five years. From the 2018 flood of the century to the October 2021 flash floods, the change is quite visible.

Experts say a rise in sea surface temperature in the Arabian Sea is one of the reasons for it and they cite frequent cyclonic circulations over the Arabian Sea to emphasise their point.

"The temperature over the Arabian Sea has gone up by 1.2 to 1.4 degrees Celsius in the last two decades increasing the frequency of cyclonic events along the western coast," said Roxy Mathew, planet scientist with the Indian In...