Meteorology may say it is a depression in the Bay of Bengal called La Nina which is responsible for the rains, but to those well versed in Astro Meteorology, it is the Sun's transit of Scorpio and the constellation of Delta Scorpi, which is the cause, as heavy rains lashed Trichur. From 0500 PM it was raining till 1100 PM, when I went to sleep.
According to Meteorology, La Nina is a coupled ocean-atmosphere phenomenon of El Nino, as a part of the El Nino Southern Oscillation Climate pattern. La Nina is defined as the dialectial opposite of El Nina !
These depressions happen only during the Monsoon season, when the Sun transits the constellations from Eta Tauri to Alpha Scorpi ! So Astro Meteorology is right !
Why do these depression not happen during the summer season?
Climate Change, triggered by Global Warming, is creating havoc throughout the world. Sea levels rose by 1.8 mms from 1961 to 2003. All snowy mountains are melting. Co2 levels are increasing. Forest fires increased. When hot air creates lightning, forest fires are more. More cyclones and thunderstorms. Extreme climatic patterns are produced. More floods and more draughts than usual.