Cyclone Montha, located 560 km from Chennai, has triggered an orange alert in northern Tamil Nadu. Heavy rainfall (up to 20 cm) is expected in Chennai, Kancheepuram, Tiruvallur, and Ranipet for 24 hours, while Villupuram, Chengalpattu, and Puducherry could see 12 cm of rain. Authorities advise caution and preparedness for potential flooding and disruptions.