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Bay brews heat-beater

The soaring mercury will drop over the weekend because of a cyclonic circulation over the Bay of Bengal but heavy rainfall is not on the cards.

The Met office said the circulation near the Odisha coast is likely to intensify into a low-pressure area and move inland over the next 24 hours, resulting in downpour in the coastal districts of Bengal on Saturday and Sunday.

The city is in the outer reaches of the system and, hence, will get clouds but not much rainfall. Localised thundershowers can happen but the clouds will not bring heavy shower, said G.C. Debnath, director of the India Meteorological Department in Calcutta.

The cloud cover will shut out the sun and keep the Celsius down.

On Friday, the maximum temperature was 35.6 degrees Celsius, four notches above normal. It was the highest the mercury has risen in more than three weeks since June 17, when 36 degrees Celsius was recorded.

The discomfort index or real feel temperature read 62 degrees Celsius, five rungs above normal because of high relative humidity ranging between 92 and 52 per cent during the day. Its likely to reduce from Saturday.

For the past few days, the mornings have been hotter than afternoons, weather experts said. On Friday, the temperature at 11.30am was 33.6 degrees Celsius but by 2.30pm it had come down to 31.8 degrees Celsius riding a hint of rain in some areas.

Weather scientists said this was the result of a weak monsoon flow, particularly in Calcutta at the moment. A lot of water vapour gets trapped in the air during the monsoon. When the sun comes out in the morning, this moisture heats up and rises and ultimately condenses to form clouds. Because of this cloud cover, the temperature drops in the afternoons, said Debnath.

The clouding is not strong enough to cause heavy rain in the absence of a weather system in the vicinity.

Calcutta has, however, received 26 per cent surplus rain till Wednesday this monsoon whereas the districts nearby have got deficient rainfall.