Chennai's Manali and nearby areas witnessed a cloudburst and heavy rainfall on Saturday night, IMD said. The cloudburst occurred over the Manali area and its neighbourhood, with Zone 2, Manali (Division 19) recording 106.2 mm-rainfall between 10-11 pm IST and 126.6 mm-rainfall between 11 pm-12 am IST. Authorities have issued a red alert for the Manali area and Wimco Nagar.