A fresh western disturbance as a cyclonic circulation is staying over Afghanistan and the surrounding neighboring areas. According to the MET, this is because a western disturbance as a cyclonic circulation is forming over Jammu & neighboring areas.
According to the India Meteorological Department, it seems that the Cold wave conditions are about to set in over Punjab, Haryana, north Rajasthan and Chandigarh between December 18 and 20. Light to moderate rainfall or snow is likely over the western Himalayan region for the next three days.
This, the Met said, is because a western disturbance seen as a cyclonic circulation is forming over Jammu & neighborhood, while a fresh western disturbance as a cyclonic circulation is lying over Afghanistan and neighboring areas.
Under their influence of predicted western disturbances forming over Jammu & neighborhood, light to moderate rainfall or snowfall is likely at isolated places in Jammu, Kashmir-Ladakh-Gilgit-Baltistan-Muzaffarabad, and Himachal Pradesh during the next three days, and in Uttarakhand on December 16-17, and isolated light rainfall is likely in northern parts of Punjab, Haryana, and West Uttar Pradesh on December 16.
RK Jenamani, senior scientist at the national weather forecasting center said,
“We are expecting light and scattered rainfall over parts of northwest India on December 16 and 17. Temperatures are likely to drop after December 17. As of today dense fog is expected only over Punjab but we are monitoring fog development over Delhi also,”
A cold wave usually occurs in the outskirts of the plains when the minimum temperature is 10 degrees Celsius or below and/or is 4.5 notches lesser than the season’s normal for two consecutive days. Cold waves are also always predicted when the minimum temperature is less than 4 degrees Celsius in the plains.
Moreover, light to moderate rainfall at isolated or scattered places is very likely in Tamilnadu-Puducherry-Karaikal, Andaman & Nicobar Islands, and isolated rainfall is likely in Kerala-Mahe during the next five days, according to IMD.
Dry weather is very likely to prevail over the remaining parts of the country over this period, and the minimum temperature in the northwest and central India is likely to fall by 2-3 degrees in the coming days, the IMD report said.