Tamil Nadu is bracing for widespread rainfall, with an orange alert issued for Chennai, Tiruchirappalli, Coimbatore and the Nilgiris on Monday. Tirunelveli and Madurai are under an orange alert for Tuesday, while heavy rain is forecast across 35 districts. Chennai: An orange alert has been issued for Chennai, Tiruchirappalli, Coimbatore and the Nilgiris on Monday, with the weather department forecasting heavy to very heavy rainfall in the four districts amid widespread rain.