CHENNAI: The Chennai and Tiruvallur district administrations have declared a holiday for all schools and colleges in their respective districts on Monday (Novem. The Regional Meteorological Centre (RMC) has issued an orange alert for Chennai and Tiruvallur districts, warning of heavy to very heavy rainfall.The India Meteorological Department (IMD) has forecast heavy rainfall across several northern Tamil Nadu districts over the next two days, as Cyclone Murasu moves towards the Andhra Pradesh.