Keep your brollies and wellies ready because the weather office on Friday warned of a weekend washout.
The pleasant spell of monsoon could give way to heavy showers on Saturday and Sunday with a trough touching base in Bihar. According to weather experts, heavy rainfall means rain between 64.5mm to 124.4mm.
For those planning a quiet weekend at home, enjoy the extended cool weather because the rain will keep the Celsius down to a comfortable 31 degrees — two degrees below normal.
“Low pressure over Bihar and parts of eastern Uttar Pradesh is drawing moisture from the Bay of Bengal. This is bringing rain-bearing clouds into the south Bengal districts,” said Gokul Chandra Debnath, the director of the India Meteorological Department in Calcutta.
Another weather scientist said: “The low-pressure trough has pulled monsoon back into the state and enhanced the chances of heavy rainfall. A similar system brought 110.6mm of rain in just two hours on June 20.”
“The monsoon trough had travelled to Gangetic Bengal from the Northeast almost 10 days ago. That’s when Calcutta experienced its highest rainfall of the season. It subsequently lost sting and pulled away southward to Odisha,” he added.
Now that the trough has become active again, the forecast has changed from moderate to heavy showers in Calcutta, North 24-Parganas, Murshidabad and Nadia.
The weather has been pleasant through June with the maximum temperature staying put at 33 degrees Celsius (average) for the past seven days because of the cloud cover and intermittent rain. The clouds ensured that the weather remained comfortable despite the relative humidity ranging between 90 and 70 per cent.
“By Sunday, the minimum temperature should slide to 26 degrees and the maximum to 31 degrees Celsius. But the mercury will rise from Monday onwards when the rainfall subsides once again,” a weather scientist said.
Monsoon has so far scored an impressive 315mm of rain, a surplus of 28 per cent, in Calcutta this month since its arrival on June 8. It is much above the normal average (283.5mm) for June. By contrast, monsoon arrived last year on June 17 and the city received 178.1mm till June 28.