Tamil Nadu and Chennai Weather Alerts: Nine districts including Chennai are predicted to get heavy rains on Tuesday, December 17. The Regional Meterological Centre has issued an orange alert for Chengalpattu, Cuddalore, Villupuram & Mayiladuthurai districts today. However, Chennai, Kancheepuram, Tiruvallur, Thiruvarur, Nagapattinam districts are on orange alert.