October ended with extra rainfall over Tamil Nadu for the second consecutive yr amid an lively northeast monsoon. After a couple of days of dry climate, rainfall exercise is prone to decide up marginally within the State from November 5.

The State has logged an total rainfall of 23.3 cm, which is 36% above its regular share (17.1 cm) for October. Most districts ended the month with regular to above regular rainfall, whereas a couple of, together with Ranipet, Tirunelveli, and Vellore, recorded largely extra rainfall following spells of heavy downpour.

In October 2024 too, Tamil Nadu had acquired 21.4 cm of rainfall, which was 25% above common for the month. This October, Chennai district too recorded surplus rainfall for the second consecutive yr.

Chennai’s Nungambakkam climate station registered the second highest October rainfall of the last decade with 32.4 cm. Final yr holds the file for the best October rainfall in Nungambakkam in the course of the decade.

B. Amudha, Head (Further in-charge), RMC mentioned the NE monsoon has carried out properly over the previous 5 years, bringing both regular or extra rainfall to the State. “This October, the State acquired rainfall nearly day by day apart from the previous few days. Lively monsoon section contributed to the surplus rainfall,” she mentioned.

Noting that the primary few days of November will convey solely dry climate over T.N., she mentioned fashions indicated a rise in rainfall from November 5, with extra readability anticipated in a single or two days.

In the meantime, the India Meteorological Division (IMD) has forecast November rainfall within the State to be possible under regular rainfall. In its month-to-month rainfall and temperature outlook, the division has predicted rainfall to be under regular over most districts. The State is prone to expertise an above-normal temperature apart from a couple of districts alongside the western ghats.

In a long-range forecast primarily based on the South Indian Ocean Convergence Zone mannequin, a crew of former meteorologists of the IMD, together with Onkari Prasad, indicated a likelihood of regular rainfall in November. Districts akin to Kallakurichi, Erode, and Tiruvarur might expertise surplus rainfall.

Y.E.A. Raj, former Deputy Director Normal of Meteorology, mentioned southwest monsoon rainfall within the first fortnight of October and early onset of northeast monsoon helped the State clock extra rainfall. The climate system in Arabian sea that continued for over 10 days additionally accentuated the monsoon rainfall in T.N.

Whereas the State has already recorded almost half of its NE monsoon quota in October, the season, recognized for its alternating moist and lengthy, dry spells might even out the general rainfall distribution, he added.