The India Meteorological Department (IMD) has observed that a persisting western disturbance would likely interact with a barrage of monsoon easterlies from the Bay of Bengal to extend rain cover into northwest India over the next two to three days.

Tuesday's twin systems to the east and west of the country continued to dictate terms weather-wise over west and central India, and to some extent, also over parts of northwest India.

SURPLUS RAIN

South peninsular India, central India and northwest India continued to return surplus rain figures while east and northeast India is slipping further into deficit (13 per cent as of Wednesday).

But the worst deficit was confined to Haryana-Chandigarh-Delhi with 32 per cent, closely followed by Assam and Meghalaya (30 per cent) in the northeast.

There is no indication of any significant recovery in the northeast, though some purchase could be expected to be had from the likely perturbation of the current wave of rains to the region.

That the monsoon would soon start withdrawing from the northwest, and the withdrawal line would cover east and northeast during the course of September, the last operative month for the season, doesn't help matters either.

600% MORE

The low-pressure area over northeast Arabian Sea off the coast of Gujarat is now expected to deepen into a well-marked ‘low' and move away to Karachi, Pakistan, and Sindh.

But it would have brought at least 600 per cent more rain than is usual for the week to entire Gujarat, Rajasthan and parts of west Madhya Pradesh, an outlook by the US National Centres for Environmental Prediction said.

Meanwhile, a weather warning from the IMD valid for the next two days said that isolated heavy rainfall would break out over Konkan, Goa, coastal Karnataka, Kerala, south Madhya Pradesh, Vidarbha, Telangana, south Chhattisgarh, north coastal Andhra Pradesh and Orissa.

LA NINA PATTERN

The tendency to rain it heavily down over central India, adjoining west India and the west coast is associated with La Nina conditions in the equatorial Pacific, the presence of which has been indicated by the Tokyo-based Regional Institute for Global Change.

An extended IMD outlook until September 5 (Monday next) said that the fairly widespread rainfall activity would continue over central and parts of northwest India and along the west coast.

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