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The heavy to very heavy rain episode over Coastal Tamil Nadu subsided on Wednesday, but the presence of a trough extending from the South Arabian Sea to North Madhya Maharashtra would provide room for a prevailing active easterly wave from the Bay of Bengal to spring surprises further into January.
India Meteorological Department (IMD) said scattered to fairly widespread precipitation accompanied with thunderstorm and lightning may continue to impact parts of the South Peninsula until the weekend as they contend with rampaging moist easterly winds from the Bay. An extended outlook said that isolated rain/thundershowers may break out over the southern parts of Kerala and Tamil Nadu from Monday to Wednesday.
Heavy rainfall recorded
The 24 hours ending on Wednesday morning heavy to very heavy and even exceptionally heavy rain being unleashed over Tamil Nadu in an unusual January pattern. Main stations recording rain (in cm) are Kelambakkam-21; Anna University and Tambaram-16 each; MGR Nagar-15; Sholinganallur and DGP Office-14 each; Chembarambakkam, Poonamallee, Korattur, Taramani ARG and Chennai Airport-13 each; Perambur-12; Alandur, Ambathur and Sriperumbudur-11 each.
Evening satellite pictures revealed clouding/rain over Tiruchirappalli, Salem and Tiruvannamalai in Tamil Nadu and Chittoor and Tirupathi in Andhra Pradesh. Most of the coastal parts of Kerala as also the adjoining Arabian Sea also saw clouds, rain or thundershowers accompanied by lightning.
Also read: Chennai gets its wettest January in decades
Cold wave over N-W
Meanwhile, weakening of a western disturbance over Afghanistan earlier than expected is slowly drying up the plains of North-West India. The cold air filling the region replacing clouds and associated precipitation, may cause minimum (night) temperatures dip by 4-6 degree Celsius during the next 4-5 days.
Cold wave conditions may head back to the plains of North-West India from Monday to Wednesday next, while the lingering moisture fanned in from the Arabian Sea by south-westerly winds associated with the western disturbance, would hang over the region in the form of dense to very dense fog from the morning hours of Thursday to Monday, the IMD said.
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