An orange alert indicating heavy rainfall has been issued for parts of Tamil Nadu and the capital, Chennai, due to the presence of an upper-air circulation — a low-pressure system that has formed over the Bay of Bengal. According to the weather agency, heavy to very heavy rainfall is expected in the southern state over the next four days.

Which districts are under the orange alert?

Chengalpattu, Chennai, Kancheepuram, Villupuram, Cuddalore, Ariyalur, Mayiladuthurai, Nagapattinam, Thanjavur, Tiruvarur, Pudukkottai and Ramanathapuram districts of Tamil Nadu, along with Puducherry and the Karaikal region, have been placed under an orange alert.

Where has a light to moderate rainfall warning been issued?

Light to moderate rainfall has been forecast for Tiruvallur, Kallakurichi and Pera

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