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A growing low pressure weather system over southeast Bay of Bengal and adjoining east Equatorial Indian Ocean is likely to reach Tamil Nadu coast sometime today, bringing fresh spell of intense rainfall across the state, especially over delta regions and north Tamil Nadu districts.
The Chennai Regional Meteorological Centre (RMC Chennai) issued orange and yellow alerts for various districts, considering the low pressure area continued to persist.
According to RMC Chennai, the associated upper air cyclonic circulation extended up to mid-tropospheric levels and is quite likely to continue to move west-northwest towards Sri Lanka-Tamil Nadu coasts.
The low pressure system could bring widespread rainfall across Tamil Nadu on Thursday and RMC Chennai is monitoring it for further growth. The low pressure area is likely to impact districts such as Cuddalore, Kallakurichi and Villupuram, that were earlier affected after Cyclone Fengal made its landfall.
Heavy rain is expected to start in Nagapattinam, Tiruvarur, Thanjavur, Mayiladuthurai, Cuddalore, and Karaikal. Rainfall could intensify, with up to 20 cm (very heavy rain) expected in some places within the delta districts and Karaikal. North Tamil Nadu districts and Puducherry may experience heavy rain.
For today, December 11, orange alert has been issued in several districts with very heavy rain likely in Cuddalore, Mayiladuthurai, Nagapattinam, Thanjavur, Tiruvarur, and Pudukkottai districts, as well as Karaikal, Puducherry.
Yellow alert has been issued in districts such as Sivaganga, Ramanathapuram, Tiruchi, Perambalur, Ariyalur, Kallakurichi, Villupuram, Chengalpattu, Kancheepuram, Chennai, and Tiruvallur districts, along with Puducherry.
The meteorological department predicts light to moderate rain in many areas of north Tamil Nadu, Puducherry, and Karaikal, with thunderstorms and lightning at a few places.
Very heavy rain is likely in isolated spots in Thanjavur, Sivagangai, Pudukkottai, and Tiruchi districts.
Heavy rain may also occur in Nilgiris, Coimbatore, Tiruppur, Kallakurichi, Cuddalore, Ariyalur, Thiruvarur, Nagapattinam, Mayiladuthurai, Villupuram, Chengalpattu, Kancheepuram, Chennai, Tiruvallur, Theni, Madurai, Ramanathapuram, Karur, Perambalur, Thoothukudi, and Dindigul districts, as well as Puducherry and Karaikal.The RMC predicted rain across Tamil Nadu until December 16. So far, Tamil Nadu has received 44.7 cm rainfall since October 1, which is 15 per cent more than the seasonal average of 38.9 cm.
