T. Ramakrishnan

Continuing low pressure trough cited for Friday's downpour

CHENNAI: A persistent trough of low pressure, lying over the Gulf of Mannar,was responsible for the heavy rains in the State on Friday, paralysing life and flooding several areas, Met officials said.

According to a senior meteorologist, several areas of the State, particularly the northern coastal districts and the Cauvery delta, received intense rain on Friday.

During the 24 hours ending 8.30 a.m. Friday, fairly widespread rainfall occurred in the State. Parangipettai registered the highest quantum of 14 cm followed by Tiruvidaimaruthur (Thanjavur district) and Cuddalore 12 cm each, Kancheepuram, Chidambaram (Cuddalore) and Sirkazhi (Nagapattinam) 11 cm each.

Nagapattinam and Sathankulam (Tuticorin) received 10 cm each, Muthupet (Nagapattinam) 9 cm, Thiruthuraipoondi (Tiruvarur) 8 cm and Sriperumpudur (Kancheepuram), Panruti and Srimushnam (both Cuddalore), Kumbakonam (Thanjavur), Tuticorin and Perambalur 7 cm each.

So far, during the current season, which began on October 19, the rainfall was, by and large, confined to the northern coastal districts besides Kanyakumari, Ramanathapuram and Tirunelveli districts. In the last few days, the Cauvery delta too witnessed heavy rainfall.


After the downpour on Friday morning, the Meteorological department said widespread rainfall may occur over the entire State and the Union Territory of Puducherry with scattered heavy to isolated very heavy.

Rainfall pattern

The meteorologist pointed out that that the monsoon had become vigorous with a fairly widespread rainfall. But, during October 1 to 25, only six districts recorded excess rainfall while 14 districts registered normal rainfall and 10 deficient. Thanjavur, known for heavy rainfall in the season, was one of the "deficient districts." Tiruchi and Coimbatore too came under this category. Tuticorin, Ramanathapuram and Virudhunagar, known as dry regions, were part of the "surplus club."

Chennai and Madurai fell under the classification of "normal districts."

The State's overall figure was 15 cm, which was the anticipated amount of rainfall.