Monsoon set to arrive in Delhi by Friday; IMD issues yellow alert for today
The southwest monsoon is likely to arrive in Delhi by Friday, the India Meteorological Department (IMD) has indicated in its Wednesday morning bulletin.
'Conditions are favourable for further advance of Southwest monsoon over some more parts of Rajasthan, Punjab, Haryana; Delhi and remaining parts of West Uttar Pradesh during next 36 hours,' the IMD bulletin said.
The IMD has also sounded a yellow alert in Delhi-NCR on Wednesday, with its forecast suggesting generally cloudy skies with light to moderate rainfall, thunderstorms, lightning, and gusty winds ranging from 30 to 40 km/h.
This rainfall is likely to significantly reduce the temperature in the national capital, bringing maximum daytime highs down to approximately 33-35°C and nighttime lows to around 26°C.
Historically, the onset of monsoon in Delhi from 1960 to 2024 has demonstrated significant variability, generally ranging between mid-June and mid-July. Notably, early arrivals occurred in 1961 (June 9) and 2013 (June 16), while the most delayed recorded onset was in 2002 (July 19).
Despite these fluctuations, the long-term average onset date has hovered around June 27, making this year's forecasted arrival date consistent with the historical average but notably earlier than the recent past, including last year's June 28 onset and June 30 in 2022.
Meteorological precursors signalling the arrival of monsoon include increased humidity levels, often exceeding 85-90 per cent, resulting in muggy weather conditions. This has been observed in Delhi over the past few days as humidity levels oscillated along this range, as per the IMD.
The easterly winds prevailing in the capital are also instrumental in carrying moisture inland, enhancing conditions favourable for rainfall. Sporadic pre-monsoon showers and thunderstorms have also occurred recently, weakening the summer heat, which, as a result, has yielded below normal day temperatures.
The maximum temperature in Delhi on Tuesday was 36.1°C, which is around 3 degrees below normal. The nighttime temperature was recorded at 29.6°C, around two notches above normal.
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