Chennai Rains: Schools, offices shut, Orange alert in Chennai; Heaviest rain since 2015

Chennai recorded the heaviest rainfall on record since 2015. Know what caused heavy rains in Chennai, Tamil Nadu? 

source https://www.jagranjosh.com/current-affairs/chennai-rains-know-key-updates-highest-rainfall-recorded-in-chennai-since-2015-1636358957-1