Chennai rain: What caused the overnight deluge that flooded Tamil Nadu’s capital?

Chennai rain: What caused the overnight deluge that flooded Tamil Nadu’s capital?

In one of Chennai’s heaviest rain episodes in 2015, the city recorded rainfall of 24.6 cm in 24 hours on November 15 and 16, breaking a November 2005 record of 14.2 cm.
Check the source here –Source, Financial Express.
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