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Updated: May 11, 2019 07:36 IST

Pre-monsoon rainfall has been 21% below the long-period average (LPA) of 82.5mm between March 1 and May 8, according to the India Meteorological Department (IMD). North-west India, with a rain deficit of 37%, and peninsular India, with a shortfall of 39%, bore the brunt.

Rainfall triggered by cyclone Fani earlier this month managed to bridge the deficit in central, east and north-east India, which have now recorded normal pre-monsoon rains, according to data put out by IMD in its weather status report released on Friday. Central India has experienced 15% surplus rain over the LPA, mainly due to showers in the past one week.

Even so, extreme heat waves in most parts of India would mean large swathes of the country will remain dry before sowing begins in June for the Kharif crop with the onset of the south-west monsoon, which is critical in India, where nearly half the population is dependent on farming and 60% of the net-sown area does not have any form of irrigation.

Millions of farmers wait for the rains to begin summer sowing of major crops, such as rice, sugar, cotton, coarse cereals and oilseeds. Half of India’s farm output comes from summer crops dependent on these rains.

Many parts of Maharashtra, Andhra Pradesh and Tamil Nadu are facing a drought-like situation despite the 2018 south-west monsoon bringing ample rainfall, experts said.

Also read: Dust storm, light rain may lower temperature over the weekend

“The water level in big dams this year is 10-15% less than previous years despite many of the regions receiving good rainfall last year,” said Himanshu Thakkar, coordinator of the South Asia Network on Dams, Rivers and People.

According to figures released by the Central Water Commission on Friday, 91 of the major reservoirs across the country are holding an average of 25% of their capacity.

Concerns of a weak monsoon this year have been fanned by a lingering El Niño, a weather phenomenon characterised by warm ocean temperatures in the equatorial Pacific Ocean that is associated with poor rainfall and more episodes of heat waves in the subcontinent.

An update by private weather forecaster Skymet Weather said on Thursday that after tapering down slightly during April, El Niño indices have risen again in the last two weeks although the increase has been marginal.

“During the beginning of monsoon, there is a 60% chance of El Niño conditions remaining steady. This is why we are expecting monsoon rain to be below normal in June and then gradually becoming normal in the latter part of July and August,” said Mahesh Palawat, vice president (meteorology and climate change), Skymet Weather. Deficient pre-monsoon rains and a weak beginning to the monsoon could have an impact on summer crop sowing, which may be compounded by deficient rainfall.

For a bountiful crop, the rains also need to be evenly distributed across regions. Robust summer rains, which account for 70% of India’s total annual rainfall, spur rural spending on most items and increases demand in other sectors of the economy. Rural sales, for instance, account for about 48% of all motorcycles and 44% of television sets sold annually if the monsoon is normal.

Also read: Heat wave conditions prevail in North India

Officials at IMD, however, said concerns about El Niño are premature. “El Niño conditions have definitely not gone up. June onwards, it will move towards neutral El Niño conditions. We don’t expect El Niño to amplify. At the most, there will be a sluggish start to the monsoon but it will not be detrimental in any way,” said KG Ramesh, IMD’s director general.

Last month was marked by heat waves in many parts of the country, including eastern Uttar Pradesh, western Rajasthan, Bihar, Chhattisgarh, Odisha, Vidarbha, and Telangana. Some northern parts of the country also recorded extremely high temperatures.

For example, Una in Himachal Pradesh recorded 41.7 degrees C on Friday; Sundernagar, also in Himachal Pradesh recorded 37.6 degrees C, Dehradun in Uttarakhand was at 38.7 degree C. The highest maximum temperature this summer recorded till now has been at Brahmagiri in Vidarbha on May 2 at 46.4 degrees C.

“Heat wave in central India, Rajasthan and Andhra Pradesh is expected in May which is the peak summer season... We have noticed that the temperature in the foothills of Uttarakhand and Himachal Pradesh are also 3 to 4 degrees above normal. Temperatures also increase before a western disturbance approaches,” said Charan Singh, senior scientist at IMD. Due to an approaching western disturbance (WD) and moisture incursion from Arabian Sea, scattered rainfall and thunderstorms are expected in north-west India and north India, including Jammu and Kashmir, Himachal Pradesh and Uttarakhand, on Sunday.

“The heat wave will abate. There will be scattered rainfall in northwest India till May 17. But it is unlikely to compensate for the deficient pre-monsoon showers over the country,” added Palawat.