Northeast monsoon to arrive in Kerala only by mid-Oct
Kochi: Scientists stated that the rain accompanied by lightning strike experienced across the state is part of the southwest monsoon. The monsoon that started late is going through its last phase. People have been cautioned about the lightning accompanied by rain.
Many people have misunderstood the rain with lighting to be northeast monsoon. Dr. M. G. Manoj, scientist at Radar Research Centre of the Cochin University of Science and Technology (CUSAT), said that northeast monsoon will hit Kerala only by middle of October.
Southwest monsoon begins in Kerala by June first week and ends by September 30. This year, rainfall was low during June and July which is why it is continuing. There was a 14 percent increase in the rainfall as part of southwest monsoon this year.
About 2049 mm rain is supposed to be received in the state during southwest monsoon, but this was 2330 mm this year according to the rain gauged till Monday. Only Idukki and Wayanad experienced a drop in rainfall. It received only 11 and 6 percent rainfall respectively.
Cause of lightning
The Sun is passing through the middle of equator during this time heating up the atmosphere without the presence of rain clouds. As the atmosphere heats up quickly, thick clouds are formed.
Along with this, the depression formed on the Tamil Nadu coast also causes formation of thick Cumulonimbus clouds which are thick upto 10 km. The lightning is caused by the discharge of positive and negative charges in the clouds.