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Regional Meteorological Centre, Chennai is one of the six regional meteorological centres (RMCs) of the India Meteorological Department (IMD) and is responsible for the weather-related activities of the southern Indian peninsula comprising the states of Andhra Pradesh, Telangana, Karnataka, Kerala, Tamil Nadu and the union territories of Andaman and Nicobar, Lakshadweep Islands and Puducherry.
The Climate of Tamil Nadu, India is generally tropical and features fairly hot temperatures over the year except during the monsoon seasons. The city of Chennai lies on the thermal equator , [ 1 ] which means Chennai and Tamil Nadu does not have that much temperature variation.
Only part of the northeast monsoon passing over the Bay of Bengal picks up moisture, causing rain in Andhra Pradesh and Tamil Nadu during the winter months. However, many meteorologists argue that the monsoon is not a local phenomenon as explained by the traditional theory, but a general weather phenomenon along the entire tropical zone of Earth .
The city gets most of its seasonal rainfall from the north-east monsoon winds, from mid-September to mid-December while smaller amounts also come from the south-west monsoon winds from mid-June to mid-September. Cyclones in the Bay of Bengal sometimes hit the city. Highest annual rainfall recorded is 2,570 mm in 2005. [10]
During the Triassic period of 251–199.6 Ma, the Indian subcontinent was the part of a vast supercontinent known as Pangaea.Despite its position within a high-latitude belt at 55–75° S—latitudes now occupied by parts of the Antarctic Peninsula, as opposed to India's current position between 8 and 37° N—India likely experienced a humid temperate climate with warm and frost-free weather ...
The storm brought heavy rainfall over the coastal districts of Tamil Nadu. Neyveli , a mining township southwest of Puducherry, recorded 139 mm (5.5 in) of rainfall on November 9 and 483 mm (19.0 in) of rainfall on November 10 [ 63 ] of which 450 mm (18 in) fell within a span of 9 hours. [ 64 ]
Though rainfall from the earlier low-pressure system ended on 24 November, another system developed on 29 November, bringing additional rain and the India Meteorological Department predicted heavy rainfall over Tamil Nadu until the end of the week. [31] [32] On 1 December, heavy rains led to inundation in many areas of Chennai. [33]
The flatlands are irrigated by the South Pennar River. The eastern part of the district experiences a hot climate and the western part contrastingly has a pleasant climate. The average rainfall is 830 mm per year. March - June is the summer season. July - November is the rainy season and during December - February winter prevails.