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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.
Southwest monsoon clouds over Tamil Nadu. Alternatively, it can be categorized into two segments based on the direction of rain-bearing winds: Southwest (SW) monsoon; Northeast (NE) monsoon [Note 1] Based on the time of year that these winds bring rain to India, the monsoon can also be categorized into two periods: Summer monsoon (May to September)
On November 23, a low pressure area formed over east equatorial Indian ocean and south-east Bay of Bengal. It moved westward (Towards Tamil Nadu - Sri Lanka coasts) and intensified into a depression on November 25. [51] On November 29, the depression intensified into cyclone Fengal. [52]
It intensified further into a depression on 25 November, moving northwestwards towards Tamil Nadu and Sri Lanka coast. On 26 November, it intensified further into a deep depression, later moving into Sri Lanka. On 29 November, the system strengthened into a cyclonic storm and hence was named Fengal by the IMD. [61]
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]
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]
Though the unusually heavy rainfall in southern India during the winter of 2015 has been attributed to the 2014–16 El Niño event, in July 2018 the Comptroller and Auditor General of India (CAG) categorised the flooding across Tamil Nadu as a "man-made disaster", and held the Government of Tamil Nadu responsible for the scale of the ...