While, the circulation persist over Sri Lanka, Gulf of Mannar and extreme South Peninsula on 18th and 19th Dec, coincidentally an easterly wave will move across, overlapping and enhancing the weather activity. Prolonged wet spell for all the 5 sub divisions of northeast monsoon is likely between 18th and 23rd Dec.
Under the influence of this system, all 5 sub divisions of northeast monsoon namely, Tamil Nadu, Coastal Andhra Pradesh, Rayalaseema, South Interior Karnataka and Kerala will experience wet spell between 18th and 23rd Dec.