Chennai, Nov 26 (UNI) The deep depression over south-west Bay of Bengal today intensified into a cyclonic storm ''Nisha'' and lay centred close to Vedaranyam in Nagapattinam district.
A special bulletin issued by the weather office here said ''Nisha'' is likely to move in a north-westerly direction and cross the Tamil Nadu coast near Vedaranyam later today.
Under its influence, rainfall would occur at most places with heavy to very heavy falls at few places. Isolated extremely heavy falls is also likely over Tamil Nadu and Puducherry during the next 24 hours.
Rainfall would occur at many places with isolated heavy to very heavy falls over Kerala, south interior Karnataka and Lakshadweep during the same period.
Gale winds with speed reaching 65-75 kmph gusting to 85 kmph are likely along and off Tamil Nadu and Puducherry coasts during the next 12 hours.
The condition of the sea would be rough with high tides along and off these coasts. Storm surge of about one metre above the astronomical tide is likely over coastal areas of Tiruvallur and Nagapattinam districts of Tamil Nadu at the time of landfall.
Fishermen have been advised not to venture into the sea.
The cyclone was expected to cause damage to thatched huts, besides snapping the branches of trees and causing minor damages to power and communication lines in the coastal districts of Tamil Nadu and Puducherry.
The bulletin said danger signal number seven was hoisted at Nagapattinam Port, danger signal number six at Cuddalore and Puducherry ports and danger signal number five at Pamban port.
Local cautionary signal number three was hoisted at Chennai, Ennore, Rameswaram, Tuticorin and Kolachel ports.
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