With the formation of yet another low pressure area (LPA) over Comorin and its neighbourhood on Saturday, heavy rain lashed the State’s coastal areas and Puducherry.
Noting that a trough from the LPA extended to the coast of Tamil Nadu-south Andhra Pradesh, the Meteorological Department, in its bulletin, stated that most places of coastal Tamil Nadu and the Union Territory would, on Sunday, receive rain or thundershowers. Many interior pockets of the State were also likely to get rain.
The origin of cyclonic storm Phyan, which crossed the coast of Maharashtra between Alibag and Mumbai on Wednesday, could be traced to the formation of an LPA over the same Comorin region on November 6.
This was responsible for Tamil Nadu receiving widespread rainfall during November 7-10.
The spell of rain, which resulted in the death of around 80 people, including 43 in the Nilgiris district, led to realisation of 19 cm rainfall all over the State. The normal amount of rainfall for the week ending November 11 is usually around 4 cm.
All the districts recorded excess rainfall in the week, with the Nilgiris leading. The western district registered 54 cm against the normal 4 cm, a deviation of 1,245 per cent. Chennai and Nagapattinam received 41 cm each (normal: 8.4 cm and 10 cm); Cuddalore — 40 cm (7.5 cm) and Kancheepuram — 36.3 cm (7.8 cm).
Tiruchi and Madurai recorded 15 cm and 16 cm (normal: 3.3 cm and 4 cm). The Union Territory of Puducherry received about 39 cm (10 cm).
As regards the season’s rainfall (October 1 to November 11), the State, as a whole, received 27.5 cm against the normal 25.6 cm, a deviation of seven per cent.
By meteorological standards, deviation in the range of minus 19 per cent to plus 19 per cent is considered normal. While seven districts each registered excess and deficient rainfall, 17 came under the category of normal.