New Delhi: India Meteorological Department (IMD) expects rains to lash the deluged city of Chennai for the next three days.

Tamil Nadu, which has already recorded 50% more than normal rainfall since October, will not get any respite due to a weather system forming in the Bay of Bengal.

Chennai experienced rainfall that was 89% more than normal. The worst-affected districts were Kancheepuram with 154% excess rainfall, Vellore with 136% and Tiruvallur with 139%. According to IMD Chennai, heavy rainfall and thundershowers can be expected in coastal Tamil Nadu till 6 December.

IMD director general L.S. Rathore said IMD, the National Disaster Management Authority and government officials in Chennai were in regular contact.

Meanwhile, flights from Chennai airport were cancelled on Wednesday as water flooded its runways. Prime Minister Narendra Modi tweeted that he spoke to Tamil Nadu chief minister J. Jayalithaa on the flood situation. “Assured all possible support & cooperation in this unfortunate hour," he added.

Torrential rains in Chennai, the heaviest in a century, have also worried IMD.

“These are not good signs. Every year, we are breaking records of warmest temperatures and the variability of rainfall in terms of quantity, duration and wet spells is increasing," said Rathore.

The IMD chief further added that there is a definite increase in the number of extreme weather events and reduction in the number of rainy days.