The Regional Meteorological Centre (RMC), Chennai, on Tuesday forecast light to moderate rain at many places with isolated thunderstorms and lightning all over Tamil Nadu, Puducherry and Karaikal for the next four days.
It has forecast heavy rain at isolated places over Cuddalore, Mayiladuthurai, Thanjavur, Nagapattinam, Tiruvarur, Pudukkottai, Sivaganga, Ramanathapuram, Thoothukudi, Tirunelveli, Kanniyakumari, the Nilgiris, Coimbatore, Tiruppur, Dindigul, Theni and Tenkasi districts.
Addressing presspersons on Tuesday, S. Balachandran, Deputy Director General of Meteorology, RMC, Chennai, said over the next four days, light to moderate rain had been forecast for many places with isolated thunderstorms and lightning likely to occur over Tamil Nadu, Puducherry and Karaikal. He also said there was an east and west sheer zone where the Easterlies and Westerlies meet, a feature favourable for rainfall activity.
For Chennai, the sky condition is likely to be generally cloudy. Heavy to very heavy rain with thunderstorms and lightning are likely in some areas. The maximum and minimum temperature is likely to be around 26 degree Celsius and 22-23 degree Celsius respectively.
Mr. Balachandran said the city had witnessed widespread rain overnight that brought down the rainfall deficit from -48% to -29% for the last month. In place of the usual 27 cm, only 14 cm was recorded from October 1 to 31.
The Nungambakkam station recorded 8.4 cm of rainfall on Tuesday, which is the third-highest in the last 72 years and the highest in the last 30 years. In 1990, the station recorded 13 cm that one day and in 1964 it recorded 11 cm of rain.
Mr. Balachandran also advised fishermen not to venture into sea for the next two days since wind speed is expected to reach 40-50 km/hr.
The amounts of rainfall recorded at various observatories in the State from 8.30 a.m. to 7.30 p.m. on Tuesday are: Nungambakkam – 6.4 cm; Meenambakkam – 5 cm, Dharmapuri – 1 cm; Nagapattinam – 2.8 cm; Tirupattur – 1.3 cm; Kalavai – 1.8 cm; Thiruchendur – 3.45 cm; Thoothukudi port – 1.95 cm; Vriddhachalam – 1 cm; Kattupakkam – 11 cm; Nandnam – 4.2 cm; A.C.S. Medical college – 3.1 cm; Chembarambakkam – 4.05 cm; Sattankulam – 1.85 cm; and Villivakkam – 5.1 cm.