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Opinion

Mercury drops to 1.6 ° C in Delhi; parts of northwestern India experience freezing temperatures

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Delhi on Friday recorded the lowest temperature of the season at 1.6 degrees Celsius, according to the Regional Meteorological Center. There was very dense fog in Palam with visibility 0 until 7am. After 7 a.m., visibility improved to about 150 meters.

Many parts of the northwestern plains have recorded minimum temperatures below zero or close to 0 ° C in recent days.

On Thursday, for example, Hisar and Narnaul in Haryana recorded -1.2 ° C and 0.5 ° C respectively; Bhatinda and Ballowal in Punjab registered 0 ° C and 0.2 ° C respectively; Sikar and Pilani in eastern Rajasthan also recorded 0 ° C and 0.2 ° C respectively, while Churu in western Rajasthan recorded -1.3 ° C. Pantnagar in Uttarakhand, Una in Himachal Pradesh recorded 0.1 ° C and 0.5 ° C, respectively.

Also read: The government advises people to stay indoors and wear warm clothing while the cold snap persists

While many of these places register 0 ° C during most winters, this year the cold is definitely severe, the scientists said.

After December 12, the western unrest mainly affected the western Himalayan region; under its influence, there were heavy snowfalls and rains over Jammu and Kashmir and Himachal Pradesh. “After the WD, cold northwesterly winds blow over Delhi NCR from Jammu and Kashmir and Himachal Pradesh. The layer of fog rising over Punjab and Haryana is also making it colder. The effect of La Niña, a global weather phenomenon, also contributed to the drop in temperatures in northwestern India this year, ”said Kuldeep Shrivastava, director of the regional weather forecast center.

A new active western disturbance likely to affect the western Himalayan region and adjacent plains from January 3 onwards. It is likely to cause light to moderate snowfall over the western Himalayan region between January 3 and 6. Due to the interaction between the western disturbance and lower-level easterly winds from the Bay of Bengal, scattered to fairly widespread rains accompanied by thunderstorms or hailstorms in isolated locations are likely over Punjab, Haryana, Chandigarh, Delhi, north from Rajasthan, western Uttar Pradesh and northwestern Madhya Pradesh during January 2-5 with maximum intensity on January 4-5, the Indian Meteorological Department said in its bulletin on Thursday.

Due to the southeastern winds over northwestern and central India, minimum temperatures are likely to gradually increase by 3-5 ° C over the next 4-5 days. Conditions from “cold snap” to “deep cold snap” are likely to occur in parts of Himachal Pradesh, Punjab, Haryana, Chandigarh, Delhi, Uttar Pradesh, Rajasthan and western Madhya Pradesh over the next 24 hours. “Cold day” to “severe cold day” conditions are likely to occur in some areas of Punjab, Haryana, Chandigarh, Delhi, Uttar Pradesh and western Madhya Pradesh for the next two days and over Himachal Pradesh for the next 24 hours.

According to IMD, a “cold day” or “severe cold day” is considered based on two parameters: a minimum temperature of less than 10 degrees and the maximum temperature is 4.5 ° C or 6.4 ° C below normal, respectively. A cold snap occurs in the plains when the minimum temperature is 10 ° C or less and / or is 4.5 notches less than normal for the season for two consecutive days. A cold wave is also declared when the minimum temperature is below 4 ° C in the plain. Witnessing a cold day and a cold snap together means that the gap between day and night temperatures is lower than normal.

Dense to very dense fog is likely in Punjab, Haryana, Chandigarh, Delhi, Uttar Pradesh and dense fog is likely in parts of Bihar, Assam, Meghalaya, Nagaland, Manipur, Mizoram, and Tripura for the next two days and above. Uttarakhand, west of Madhya. Pradesh for the next 24 hours. Ground frosts are likely to occur in parts of Punjab, Haryana, Chandigarh, Delhi and northern Rajasthan for the next 24 hours.

“For many years, the minimum temperatures in Churu, Ganganagar, Bikaner, Hanumangarh, Hisar, etc. they reach 0 ° C because these places are in desert regions where nights can be extremely cold but daytime temperatures are relatively higher so that people do not feel the cold. here. Climatologically we are in the middle of winter and there is an impact of cold winds from snowy mountains that are causing even the plains to reach sub-zero temperatures. Minimum temperatures are likely to increase significantly from January 2 due to the approaching western disturbance, ”said Mahesh Palawat, vice president of climate change and meteorology at Skymet Weather.

El Niño and the Southern Oscillation (ENSO) is a periodic fluctuation in sea surface temperature and air pressure from the overlying atmosphere across the equatorial Pacific Ocean according to the National Oceanic and Atmospheric Administration (NOAA).

ENSO has a great influence on weather and climate patterns such as heavy rains, floods and droughts. El Niño has a warming influence on global temperatures, while La Niña has the opposite effect. In India, for example, El Niño is associated with droughts or weak monsoons, while La Niña is associated with heavy monsoons and above-average rainfall and colder winters.

“We have already said that below normal temperatures are expected in northwestern India during winter. We know that cold westerly winds tend to move inland during La Niña years, which is why winter is more pronounced, ”said DS Pai, lead scientist at the Indian Meteorological Department, Pune, explaining the impact of La Girl last week.

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