This was the third likely date of monsoon’s arrival issued by the IMD in as many days. Earlier, the department had said the system could hit the region on Saturday, later revising it to Sunday.
“Easterly winds and cloudiness conditions have increased in the region and the onset of the monsoon is likely to happen on Monday. Rain is also expected by Monday morning. The onset date has been extended by 24 hours on Sunday as it has to be supported by cloud and rain,” said R K Jenamani, scientist at IMD.
Another met official said, “As per the standard operating procedure, the onset of monsoon is declared based on the rainfall reported during the past 24 hours ending at 8.30am on the day. No rainfall was recorded between 8.30am of July 10 and 8.30am of July 11.”
This year, the monsoon has repeatedly defied IMD’s onset forecast for the capital. The department had originally predicted an early onset over the region, saying the rain system could arrive around June 15, 12 days ahead of its normal date of June 27. But the system stalled at the doorstep of NCR before going into a weak phase for over two weeks.
“As on Sunday, lower-level easterly winds from the Bay of Bengal have further extended northwestwards, reaching up to Delhi, Haryana and east Rajasthan. Low level relative humidity has also increased over the region. Hence, the conditions continue to remain favourable for further advance of southwest monsoon over Delhi, remaining parts of west Uttar Pradesh and some more parts of Punjab, Haryana and Rajasthan during next 24 hours,” IMD’s bulletin said.
It added that conditions were also becoming favourable for further advance of southwest monsoon over the remaining parts of the country during the subsequent 48 hours.
If the monsoon arrives in Delhi on Monday, it would be the most delayed monsoon in 19 years. The last time Delhi witnessed a more delayed onset was in 2002, when the monsoon arrived on July 19. In 1987, the monsoon hit Delhi as late as July 26, an all-time record delay, IMD data shows.
Some parts of Delhi on Sunday received ‘trace’ rainfall while IMD has predicted light rain along with gusty winds from Sunday night to Monday morning. The maximum temperature at 39 degrees Celsius was three degrees above normal. The minimum temperature settled at 28.8 degrees Celsius, one degree above normal. The relative humidity oscillated between 76% and 51%.