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Conditions ripe for weekend rain

Brace for a wet weekend and this winter’s final hurrah as a tempest from Gujarat has reached Bihar, on course to bring showers to Calcutta.

The weather office says the cyclonic circulation hurtling towards the city would keep the city under overcast skies on Saturday with the possibility of rain in the evening. Sunday is expected to follow the previous day’s pattern.

Rainfall will vary between drizzle and smart shower but bring the Celsius down when the sky clears up by Monday, after about 24 hours of cloud cover.

“The circulation is likely to bring light to moderate rain and rainfall will vary in different parts of the city,” said an official of the India Meteorological Department, Calcutta. “If the wind stops blowing and rain-bearing clouds hang motionless over a particular area, the place would get a little more rain,” he added.

“Moisture incursion has already started over eastern India because the atmospheric pressure within the circulation is lower than its surroundings. The system is sucking moisture-laden air from the Bay of Bengal,” said a weather expert.

The conditions would be ripe for a cloudy sky and showers by Saturday, he added.

The weather charts say the circulation is at a height of 3.1km from the ground, the kind of altitude that ideally brings light to moderate showers or rainfall between 2.5mm and 34.5mm.

The mercury jumped a bit on Friday because of the moisture-laced sea breeze raising the relative humidity, which blocked the cold wind from the north. The minimum touched 16.9 degrees Celsius on Friday, up from the previous day’s 16.3.

It may climb to 18 degrees on Saturday and 19 degrees on Sunday, before sliding to 17 on Monday and 15 on Tuesday. A cold wave in north India will keep the mercury in the lower teens at least till Thursday.