Fall in temperature of Northwest India, Air in intense category Delhi-NCR.
Key sentence:
- Air quality in several parts of Delhi NCR on Saturday remains in the ‘extreme’ category.
- A cyclonic circulation lies at mid-tropospheric levels throughout the southwest Bay of Bengal off the coasts of Tamil Nadu.
- IMD’s Friday bulletin says conditions were becoming favourable for the cessation of northeast monsoon rains across Tamil Nadu.
Air quality in several parts of Delhi NCR on Saturday remains in the ‘extreme’ category. This morning, Delhi’s air quality index was 441, Faridabad, Ghaziabad, Greater Noida as well as Noida have also registered ‘extreme’ air quality that even the safe have a negative impact.
According to the India Meteorological Department:
This is primarily due to the low wind speed that does not allow contaminants in the air to be distributed. Minimum temperatures were likely to drop by 2-4 degrees Celsius over many other parts of northwest India throughout the next two days related to dry north/northwest winds, as per the Meteorological Department of India.
As per the weather Department:
Delhi, Uttar Pradesh, northern Rajasthan, sub-Himalayan West Bengal, Punjab, Haryana, Chandigarh, Sikkim as well as Bihar are most likely to have dense to very heavy fog in isolated areas over the next three days.
Over the next two days, cold wave or ‘extreme’ cold wave situations are also very probable over Punjab, Uttar Pradesh, Rajasthan, Haryana, Chandigarh, Delhi, and east Madhya Pradesh. According to the weather department, cold day situations in isolated pockets are also quite likely over Punjab, Uttar Pradesh, Haryana, Chandigarh, Delhi, and Bihar throughout the next two-three days.
IMD, a cold day or a severely cold day is classified:
A cold day or an extremely cold day is defined as such according to IMD, depending on two parameters a minimum temperature below 10 degrees C as well as a maximum temperature under average, respectively, of 4.5 degrees C or 6.4 degrees C.
In the plains, a cold snap occurs when the minimum temperature is 10 degrees Celsius or below and/or for two consecutive days, 4.5 notches less than the regular season. If the minimum temperature in the plains is under 4 degrees C, a cool wave is also announced.
As per the IMD bulletin:
A cyclonic circulation lies at mid-tropospheric levels throughout the southwest Bay of Bengal off the coasts of Tamil Nadu as well as a trough that runs over central parts of the southern Arabian Sea including adjacent to the Comorin zone of the equatorial Indian Ocean.
The situation is likely to results in moderate thunderstorms including lightning scattered to relatively widespread rainfall over Tamil Nadu, Puducherry, Karaikal, Kerala, Mahe as well as Lakshadweep region across the coming two days and a decrease in rainfall activities afterwards, as per IMD bulletin.
Further stated in IMD’s bulletin:
IMD’s Friday bulletin says conditions were becoming favourable for the cessation of northeast monsoon rains across Tamil Nadu, Puducherry, Karaikal, Kerala as well as Mahe and adjacent coastal areas of Andhra Pradesh and also Yanam, Rayalaseema, and south Karnataka interiors about January 19.
