Overview

• IMD declared onset of the southwest monsoon over Delhi and the entire country on June 29 after light to moderate rainfall across Rajasthan, western Uttar Pradesh, Haryana and the capital met the criteria
• The arrival in Delhi occurred two days after its long-period average date of June 27, while nationwide coverage came nine days ahead of the July 8 schedule
• A lingering anticyclonic circulation in the mid- and upper-levels weakened and a northward shift of the east-west trough enabled moisture-laden winds to advance into Delhi
• The IMD has issued yellow alerts for Delhi-NCR through June 30 forecasting light to moderate rain, thunderstorms, lightning and gusty winds up to 50 km/h
• Onset rains triggered a sharp temperature drop, improved air quality to satisfactory levels and led to waterlogging and traffic disruptions in low-lying areas of the capital