The southwest monsoon is unlikely to set in over Kerala on Friday as expected, as the criteria set for the declaration of the arrival of monsoon are yet to be fulfilled.
According to the parlance of the India Meteorological Department (IMD), 60% of the listed 14 rainfall monitoring stations in Kerala should report a rainfall of 2.5 mm or more for two consecutive days for the declaration of the arrival of the monsoon. Further, the depth of westerlies should be maintained up to 600 hPa along with persistent convection (cloudiness indicated by Outgoing Longwave Radiation (OLR) values).
All these criteria are not met except outgoing long wave radiation, which is almost reaching but not consistent on all days.
