IMD has issued a red alert for several districts of Tamil Nadu and predicted heavy to very heavy rainfall today (Friday) and tomorrow (Saturday) amid Cyclone Fengal. The affected districts include Chengalpattu, Viluppuram, Cuddalore, Mayiladuthurai, Nagapattinam, Chennai, Tiruvallur, Kancheepuram and Kallakurichi. Several other districts, including Ariyalur and Ranipet, are under orange alert.