Heavy to Very Heavy Rainfall very likely at isolated places over East Uttar Pradesh, Bihar, Jharkhand, West Bengal, Sikkim, ghat areas of Madhya Maharashtra, Konkan, Goa and Coastal & South Interior Karnataka

According to the National Weather Forecasting Centre of the India Meteorological Department (IMD):

All India Impact Based Weather Warning Bulletin

16 June (Day 1):♦ Heavy to Very Heavy Rainfall very likely at isolated places over East Uttar Pradesh, Bihar, Jharkhand, West Bengal & Sikkim, ghat areas of Madhya Maharashtra, Konkan & Goa and Coastal & South Interior Karnataka and Heavy Rainfall at isolated places over Himachal Pradesh,

Uttarakhand, East Madhya Pradesh, Vidarbha, Chhattisgarh, Odisha, Arunachal Pradesh, Assam & Meghalaya, Nagaland, Manipur, Mizoram & Tripura, Telangana, North Interior Karnataka, Kerala & Mahe and ghat areas of Tamil Nadu.

♦ Thunderstorm with lightning & gusty winds (speed reaching 30-40 kmph) very likely at isolated places over Jammu & Kashmir, Ladakh, Gilgit-Baltistan & Muzaffarabad, Himachal Pradesh,

Uttarakhand, Punjab, Haryana, Chandigarh & Delhi, Uttar Pradesh, East Rajasthan, Andaman & Nicobar Islands, Telangana and with lightning at isolated places over East Madhya Pradesh, Vidarbha, Chhattisgarh, Bihar, Jharkhand, West Bengal and Sikkim, Arunachal Pradesh, Assam & Meghalaya, Nagaland, Manipur, Mizoram & Tripura and Gujarat state. Thunderstorm/Duststorm with gusty winds (speed reaching 30-40 kmph) at isolated places very likely over West Rajasthan.

• Squally weather (wind speed reaching 40-50 gusting to 60 kmph) very likely over North and adjoining East central Bay of Bengal along and off Odisha-West Bengal coasts, West central Bay of

Bengal along & off north Andhra Pradesh Coast; speed reaching 40-50 kmph gulf of Mannar, along & off Kerala-Karnataka-Goa-Maharashtra-Gujarat coasts. Strong Winds (speed 45-55 kmph) over southwest, west central and adjoining east central Arabian Sea. Fishermen are advised not to venture into these areas.

The air quality over Delhi-NCT is likely to remain in Moderate category today & Moderate to Satisfactory category on 17th & 18th June 2021

According to the National Weather Forecasting Centre of the India Meteorological Department (IMD):

Wind Pattern and Ventilation Index Forecast

Air mass inflow forecast in Delhi along with predicted ventilation coefficient and weather forecast is as follows:

1. The air quality over Delhi-NCT is likely to remain in Moderate category on 16.06.2021 and Moderate to Satisfactory category on 17.06.2021 and 18.06.2021. The predominant pollutant will be PM10 as strong winds may raise dust locally and transport of dust from nearby regions. The Outlook for subsequent 5 Days: The air quality is likely to remain in Moderate to satisfactory

2. The predominant surface wind is likely to be coming from East/Northeast direction of Delhi with wind speed of 10-20 kmph and generally cloudy sky with light rain/thundershowers accompanied with gusty winds (speed 30-40 kmph) on 06.2021. The predominant surface wind is likely to be coming from variable direction of Delhi with wind speed of 10-16 kmph and partly cloudy sky with possibility of very light rain/thundershowers on 17.06.2021. The predominant surface wind is likely to be coming from Southeast direction of Delhi with wind speed of 10-16 kmph and partly cloudy sky on 18.06.2021.

3. Predicted maximum mixing depth is likely to be approx. 2000 m on 16.06.2021, 3300 m on 17.06.2021 and 3000 m on 18.06.2021 over Delhi. Maximum Ventilation index is likely to be approx. 4000 m²/s on 16.06.2021, 10000 m²/s on 17.06.2021 and 7000 m²/s on 18.06.2021. The ventilation index lower than 6000 m²/s with average wind speed less than 10 kmph is unfavourable or dispersion of

4. The strong surface winds are favourable for raising dust locally and transport of dust from nearby

5. Detailed forecast analysis and verification can be seen at https://ews.tropmet.res.in.