The Kolkata sky was overcast for most of Wednesday and the minimum temperature stayed on the higher side.
A cyclonic circulation over Bangladesh brought in the clouds, said a Met official.
The circulation is tipped to weaken in a few days and rain is unlikely in the city.
But the sky is likely to remain cloudy in phases till at least December 5. The nights are also going to be warmer than usual, according to the Met forecast.
A low-pressure area that took shape over the Bay of Bengal on Tuesday gained steam on Wednesday. It is headed towards the southern coast of India.
“It is likely to move west-northwestwards and intensify into a depression over the southeast Bay of Bengal on November 30. Thereafter, it is likely to move northwestwards and intensify gradually into a cyclonic storm over southwest and adjoining southeast Bay of Bengal around December 2,” said a Met update.
The Met office remained non-committal on the course of the storm after it reaches the northwest Bay.
“By December 2, it is likely to reach northwest Bay. If it does not take a recurve, it is likely to hit the Andhra (Pradesh) or Tamil Nadu coast. But if it takes a recurve, the destination is likely to change,” said G.K. Das, director of IMD, Kolkata.
The cyclone will be called Michaung, a name given by Myanmar.
The minimum temperature in Kolkata was 20.7 degrees Celsius on Wednesday. It was three notches above normal.
“The northwesterly winds are missing. Northerly and northeasterly winds are dominant now,” said a Met official.
The moisture content in the atmosphere is on the rise. On Wednesday, the minimum relative humidity was close to 60 per cent, up from around 45 per cent a week ago.
“The storm will have any direct impact on Kolkata only if it makes a sharp recurve from the northwest Bay. But even it does not do so, it will play a spoilsport to the chill," said the Met official.