The Southwest monsoon has set in over Kerala on Sunday, three days ahead of the normal onset of June 1.
The India Meteorological Department (IMD) announced the arrival of the monsoon after the conditions set for declaration of onset of monsoon over Kerala are satisfied in the morning. There had been widespread rainfall activity over Kerala during the past 24 hours and out of 14 rainfall monitoring stations for declaring the onset of monsoon over Kerala, 10 stations had received rainfall of 2.5 mm or more, said an IMD bulletin.
Further, the strength of the westerly winds, another parameter, have increased over southeast Arabian Sea. Finally, cloudiness over southeast Arabian Sea and adjoining areas of Kerala have also increased, a parameter called outgoing longwave radiation (OLR) which is about 189.7 W/M2 (below 200 W/square metre).
