Delhi Monsoon has remained absent from the game for quite some time now. So much so that Monsoon had been playing hide and seek with no relief in sight for Delhiites.
Between June 1 and July 12, Delhi remained rain deficient by 67%. This is second most delayed monsoon over Delhi after the year 2002. Moreover, in the year 2002 Monsoon had arrived over Delhi on July 19.
Monsoon 2021, is unique in a way that this time it reached Jaisalmer before Delhi. This delay in monsoon over the national capital can be attributed to shifting of trough in foothills of Himalayas in the latter part of June. This has resulted in break monsoon like condition. Break monsoon occurs when the axis of monsoon trough shifts to foothills of the Himalayas and humid easterly winds are replaced by dry and hot westerly winds. This time, break monsoon like condition continued for much longer duration.
A low pressure area developed over West Central Bay of Bengal which resulted in shifting of trough to the central parts of the country. Central India has been receiving heavy rainfall since last few days. Patchy rain and thunder showers are going on over Northern Plains barring Delhi parts of Haryana West Uttar Pradesh and North Rajasthan. Now, we can say that Monsoon is finally here because since last few days we have seen easterly humid winds are blowing across Northern Plains and low clouds were also present. Temperature will subside now, although we can say for next 2-3 days rainfall will be light and patchy over Delhi NCR and adjoining parts.
However, rainfall will pick up pace once again by July 16 or 17 as the trough which is at present over central parts of the country will again start moving towards Indo Gangetic plains.