Why rain-bearing clouds are thinning out over India


The India Meteorological Department (IMD) has predicted that this year’s monsoon rainfall will be around 98 per cent of the long-period average, which is good news in this drought-prone era. But another study by the same IMD shows a more worrying trend. It has found that rain-bearing clouds have been thinning out across the country over the last 50 years. The study, published in the IMD journal Mausam, shows that between 1960 and 2010, annual mean low cloud cover (responsible for the bulk of the rainfall) over India has been decreasing by 0.45 per cent per decade on average. Low clouds are declining over various seasons as well, the most significant one being during the monsoons. The study has found that the decline during the monsoon has been 1.22 per cent per decade on an average. India gets around 70 per cent of its annual rainfall and snowfall during the monsoon, from June to September. According to the study, the number of rainy days is also declining during the monsoon season at an average rate of 0.23 days for every decade. (MR, Inputs: Agencies).


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