New Delhi: The India Meteorological Department (IMD) has predicted the four days of intense rain in Delhi, as the result of a western disturbance, ended in a hailstorm in some parts of the Capital around 7.30 am on Wednesday.
IMD information shows that Delhi has in the course of the most recent four days got 56.6 mm rainfall, the most elevated in January since 1999 when the city got 59.7 mm. In 2019, the city had gotten 54.1 mm rain in the month.
Kuldeep Srivastava, head of IMD’s regional weather forecasting centre, told Hindustan Times, “The impact of the western disturbance was leading to a higher maximum and minimum temperatures in Delhi and NCR towns. Temperatures will start dipping from Thursday, There is also a forecast of dense fog over Delhi in the coming two days.”
As per the IMD data, the air quality over Delhi-NCR continues to be in the Moderate category owing to rain and better wind conditions favorable for both washout and dispersion of pollutants.
The air quality is likely to deteriorate marginally but remains in the Moderate to Poor category on 07.01.2021 and Poor category on 08.01.2020. Outlook for subsequent 5 Days: The air quality is likely to remain largely in the Moderate to Poor category.
The predominant surface wind is likely to be coming from the East/Northwest direction of Delhi with wind speed 08-10 kmph, generally cloudy sky and mist on 06.01.2021.
The predominant surface wind is likely to be coming from the Northwest direction of Delhi with wind speed upto 08 kmph, partly cloudy sky, and dense fog in the morning on 07.01.2021. The predominant surface wind is likely to be calm during morning hours and coming from the North/Northwest direction of Delhi with wind speed 06-08 kmph during the daytime, partly cloudy sky and dense fog in the morning on 08.01.2021.
The predicted maximum mixing depth is likely to be approx. 1200 m on 06.01.2021, 1400 m on 07.01.2021, and 500 m on 08.01.2021 over Delhi. The ventilation index is likely to be approx. 4000 m2/s on 06.01.2021, 2500 m2/s on 07.01.2021 & 3000 m2/s on 08.01.2021. The ventilation index lower than 6000 m2/s with an average wind speed less than 10 kmph is unfavorable for dispersion of pollutants.