As have been reiterated by Skymet, the onset of Monsoon is a complex phenomenon involving research for weeks and sometimes months. Before declaring the onset of Monsoon in Kerala we should follow certain guidelines, which revolve around changes in rainfall, wind pattern, humidity and outgoing longwave radiation (OLR).
As and when Monsoon starts knocking at the door, we watch out for more than 2.5 mm of rainfall for consecutive two days in at least 60% of the stipulated 14 weather stations across Kerala, coastal Karnataka and Lakshadweep. These stations are Minicoy, Aminidivi, Kollam, Thiruvananthapuram, Kannur, Punalur, Alappuzha, Kottayam, Kochi, Thrissur, Kozhikode, Thalassery, Kasargode and Mangalore.
As of now, more than 60% of the available 14 stations have already received more than 2.5 mm of rain for the last 2 days. As for the masses, Monsoon-like rainfall activity has already commenced in the region. The following rainfall figures (in millimeters) recorded over the last 3 days suffice for the above statement.
However, we have to wait and watch if the other criteria, such as wind field and OLR, are in line for the declaration of Monsoon or not.
Image Credit - Indian Express
Please Note: Any information picked from here must be attributed to skymetweather.com