Chennai: Even as the city is to yet to steady itself from the havoc created by rainfall, the US Climate Prediction Center's forecast that it will receive heaviest rainfall between 30 November and 6 December has shocked many.
Heavy rainfall is expected to strike the entire regions of Tamilnadu, Kerala and few other regions down south, said the US forecast .
It has also said it is going to be the most critical time for the State where rainfall will reach its peak. It also saw a well-marked low pressure area at work along the east coast which would particularly affect Tamilnadu.
Apparently choosing to play it safe, officials at the Regional Meteorological Centre (RMC), Chennai, said a trough of low pressure is likely to be formed on 27 November in south Andaman sea, due to which heavy to very heavy rainfall can be expected on 27, 28, 29 of November over Tamilnadu.
As per the latest forecast from the RMC, the low pressure that was present yesterday near Sri Lankan coast has become less marked now. Due to this, chances of rainfall in Tamilnadu is minimal and it is likely to receive only isolated rains in a few places over the State.
This is because the trough, which was initially lying over southwest bay and the adjoining equatorial Indian Ocean has moved towards the Sri Lankan coast with a cyclonic circulation aloft extending up to 1.5 km above mean sea level.
"Chennai will also receive minimal rainfall over isolated regions," said an official of the Met office.
As of now, clouds have moved out of Tamilnadu, Puducherry and coastal Andhra Pradesh and the city would experience a brief period without rainfall in some places and light rains in isolated regions. This would soon break away to heavy downpour, owing to the 'low' that might be formed by the end of this week, he said.