On and off pre-Monsoon rains have been lashing the southern state of Kerala for the last many days. During the month of May, it rained almost every day with varying intensity. The day used to begin on a sunny note, becoming cloudy during the late afternoon hours and finally raining during the late evening hours.
In general, the pre-Monsoon activities over Kerala is influenced by two weather systems. The first is the north-south trough extending across interior parts of Southern Peninsular India. The second is any weather system moving from east to west in the Indian Ocean in the form of a cyclonic circulation or low-pressure area mostly over the Comorin region.
Somewhat similar weather was prevailing in Kerala for the last three to four days.The last system that gave good rains over the state was a low-pressure area that brewed in Southwest Arabian Sea. This system is at present seen over the Gulf of Aden and Somali coast.