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Wednesday, July 28, 2021

Colder winter in north, central India in December-January: IMD

Madhya Maharashtra, Konkan and the entire southern peninsular region will experience either a normal or a warmer winter this season, according to the weather bureau.

Written by Anjali Marar | Pune |
Updated: November 30, 2020 2:04:50 am
delhi weather news, north india weather news, colder winter this year, severe winter in 2020, La Nina, indian express, snowfall kashmir, snowfall himachalSnow-covered houses in Tangmarg of Jammu and Kashmir. (Express photo: Shuaib Masoodi)

Rajasthan, New Delhi, Jammu and Kashmir and Ladakh, along with other states in Northern and North-western India, are set to experience a colder winter during December to January.

This was stated in the India Meteorological Department (IMD) seasonal forecast ‘Seasonal Outlook for Temperatures during December 2020 to February 2021’ issued on Sunday.

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“During the winter season, below normal minimum temperatures are likely over most sub-divisions in the north, northwest, central and a few subdivisions in east India,” said the seasonal forecast.

Delhi recorded the decade’s coldest November day on Sunday, with the mercury settling at 7 degree Celsius, which was 3 degrees below normal.

During the next three months, west Rajasthan, east Rajasthan, Jammu and Kashmir and Ladakh, Chhattisgarh and east Madhya Pradesh subdivisions can expect below-normal minimum temperatures.

On the other hand, Madhya Maharashtra, Konkan and the entire southern peninsular region will experience either a normal or a warmer winter this season.


What’s behind the forecast

The IMD has attributed the forecast this year to ‘moderate’ La Niña conditions, the cold counterpart of El Niño -- both are opposite phases part of a natural ocean-atmosphere pattern in the tropical Pacific Ocean that are likely to switch every three to seven years, lasting for nearly 9 to 12 months with an irregular frequency and impacting weather across the globe. La Niña conditions have prevailed since August, with the wind blowing warm surface water and the cooler water rising to the surface. The IMD has said that La Niña conditions would continue till the end of the winter season, likely to bring a longer and colder winter in several parts of India.

Last two winters, particularly over the North and Northwest India, have remained severe.

In 2018, a phenomenon named polar vortex had brought highly cold winds from the North Pole penetrating lower latitudes, including India. Similarly, last year, a severe cold wave gripped Delhi and neighbouring areas for over three weeks in December.

This year, the cooler winter is linked to moderate La Nina conditions prevailing over the Pacific Ocean.

“During the La Nina years, minimum temperatures tend to remain slightly below normal. In addition, some synoptic conditions could help keep the temperatures below normal,” said Dr D Sivanand Pai, head, Climate Research and Services at IMD, Pune.

On the contrary, day time could remain warmer during these months over most areas, Pai added.

The seasonal forecast said that most subdivisions, except southern India, are likely to experience above normal maximum temperatures.

Weak conditions of La Nina –– the abnormal cooling of the seas along the central and equatorial Pacific Ocean –– prevailed since August. They have cooled further to become ‘moderate’ conditions recently. The IMD has said that La Nina conditions would continue till the end of the winter season.

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