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After a prolonged dry spell between 06th and 16th Sep, Delhi witnessed moderate showers for the last two days. Both Safdarjung and Palam recorded 7mm rainfall each yesterday. Earlier, Safdarjung had registered heavy showers the previous day, amounting to 45mm rainfall in a very short duration. Safdarjung has so far recorded 137mm rainfall in September against the monthly normal of 128mm.
The rainfall activity over the last two days was due to the proximity of an east-west trough. A trough was connecting a pair of circulations, one each over Central Uttar Pradesh and East Bihar, and extending up to the Delhi region. The circulation over Bihar has filled up now, and the one over Uttar Pradesh has also become less marked and shifted eastward as well. Tomorrow onward, this feature will become insignificant and lead to the cessation of weather activity.
The remnant effect of the east-west trough may trigger a brief spell of passing showers in some areas during afternoon/evening hours. As the system breaks up along the foothills tomorrow, the weather pattern will change and once again turn dry, as in the first half of the month. The surface winds will become dry and strong for the next 4–5 days. Also, the moisture levels will drop, and temperatures will rise to go above normal for the next few days. Overall weather conditions are likely to become hot and sultry, as normally seen around the time of withdrawal of monsoon.
The capital city has fared quite well this monsoon season. All four monsoon months have recorded more than normal rainfall. June, July, and August registered an excess of 45%, 24%, and 72% rainfall respectively. The city base observatory has recorded 902.6mm rainfall against the normal of 640mm. Delhi has an annual rainfall of 762.3mm, and it was far exceeded in the monsoon months itself.
There is a strong monsoon system forming over the Bay of Bengal around the middle of next week. This system will move deep inland to reach parts of West Madhya Pradesh and East Rajasthan. Its interaction with the westerly system at the fag end of the month may bring some rains over and around Delhi between 28th and 30th September. This may delay the withdrawal process from Delhi. The recent records show that the monsoon has retreated from Delhi/NCR in the last week of September or the first week of October. The monsoon exited the region on 02 Oct last year, and it withdrew on 30th Sep in 2023. The latest withdrawal in the last 10 years was on 10th Oct in 2019.
Must Read: Fresh Monsoon System To Form Over Bay Of Bengal, Monsoon Retreat From Central Parts May Be Delayed
