The trough of low pressure in the south west Bay of Bengal over Sri Lanka has intensified into a well marked low pressure area over the Comorin sea, as observed by the weather officials in Chennai. The India Meteorology Department, Deputy Director General Dr Balachandran told reporters in Chennai, the weather system is expected to further concentrate in to a Depression in the next 24 hours and into a Deep Depression in the subsequent 24 hours.<br />''<br />''Under its influence, all the southern districts of Tamil Nadu and a  few northern districts of the state are expected to witness light to moderate rain for the next two days with the possibility of heavy rain at isolated places. Fishermen have been asked not to venture into the Kanyakumari sea, South West Bay of Bengal, the Gulf of Mannar, Lakshadweep and the Maldives till the 31st of this month.<br />''<span style="color: #222222;"><br />''Meanwhile, several parts of the state witnessed scattered rainfall in the last twenty-four hours, as the North East Monsoon is vigorous over the Region.</span><br />