CHENNAI: Chennai’s northeast monsoon debut has delivered an extraordinary burst of rainfall , with North Chennai recording more than 300 mm in 24 hours at individual rain gauges, raising questions about the limits of weather forecasting and the ability of disaster management agencies to prepare for hyperlocal extreme events. The heaviest rainfall was concentrated around Parrys, Kathivakkam, Sathangadu, Ennore and Kargil Nagar on Saturday evening and night. The Greater Chennai Corporation’s rainfall dashboard recorded 361.9 mm at its Zone 5 Parrys gauge. The event was particularly northworthy...