An unusual and powerful spell of "Western Disturbances", originating in the Mediterranean sea, has made the Hindi heartland shiver for the past fortnight. Unfortunately, the spell, striking once in four to five decades, will continue to freeze people on New Year's Eve too.

from Times of India https://timesofindia.indiatimes.com/india/unusual-spell-of-cold-wave-grips-north-india-scientists-explain-why/articleshow/72985201.cms