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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.
[15] [16] Southern districts of Odisha were also to receive heavy rainfall due to the cyclone, and the Odisha Disaster Rapid Action Force were deployed to assist local authorities. [17] Heavy rain and strong winds battered the coastal areas. [18] Persistent rains caused widespread flooding and inundation in Chennai, the capital of Tamil Nadu. [19]
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.
Three years of failed monsoon in 2016, 2017, and 2018. The 2018 monsoon season was one of the driest ever recorded in Chennai, as only 343.7 mm of rain had fallen compared to an average of 757.6 mm, which was a 55% rainfall deficit. Additionally, the entire state of Tamil Nadu had recorded a 23% rainfall deficit in that season. [11]
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 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]
[70] [71] Some places have recorded extreme rainfall, notably Orathanad, Thanjavur district where over 660 mm of rain fell within a period of 24 hours and broke the 65-year-old record of highest rainfall registered in 24 hours in Tamil Nadu. Previously the highest amount of rainfall in a day was 570 mm registered by Cuddalore on May 18, 1943. [72]
Heavy rains associated with the depression caused extensive flooding in Tamil Nadu. [46] Daily accumulations exceeded 150 mm (5.9 in) in many areas, including 190 mm (7.5 in) in Sathankulam. [47] Officials issued extreme rainfall warnings for six districts and more than 21,500 trained volunteers were placed on standby.