TV
The India Meteorological Department (IMD) once again hit the bull’s eye regarding the onset of monsoon is concerned. The forecast for monsoon onset over Kerala in 2024 was correct and it was the nineteenth consecutive correct forecast for this event except the year 2015 since the commencement of onset forecast in 2005.
The country received actual seasonal rainfall of 108 percent of the Long-Range Forecast (LPA). Out of the total 36 meteorological subdivisions, 2 subdivisions received large excess (9% of total area), 10 subdivisions constituting 26% of the total area of the country received excess, 21 subdivisions received normal rainfall (54% of the total area) and 3 subdivisions (11% of the total area) received deficient season rainfall.
Total Formation Of Low Pressure, Depression And Cyclonic Storms
As per IMD, six monsoon depressions formed and one intensified into Cyclonic Storm in 2024. In June, only one low-pressure system developed over the Bay of Bengal (BoB) and monsoon onset was delayed over many subdivisions over Indo Gangetic plains, causing large rainfall deficiency over the region.
A total of three low-pressure systems (LPS) were formed during July (15 -17, 18-23 and 26-28 July). Out of these, one system intensified into Depression (19 to 20 July). The low-pressure systems formed during the monsoon season contributed heavy and very heavy rainfall over many parts of the country.
August
In August, 6 low-pressure systems formed (2 low pressure areas (one over land during 3- 5 August, one over Arabian Sea during 22 - 24 August), 1 well marked low pressure area over Bay of Bengal during 25 - 28 August, 1 Depression over Bay of Bengal during 29 August – 2 September, one land Deep depression during 2 - 5 August and one cyclonic storm “ASNA” over Bay of Bengal during 16 August - 2 September).
These low pressure systems helped to get good rainfall over many parts of the country, said IMD.
September
In September, three low-pressure systems formed (one Deep Depression over West central and adjoining Northwest Bay of Bengal (8th- 10th Sept, 11-13 Sept 2024), which moved to Northeast Madhya Pradesh and weekend over the same areas as a well-marked Low pressure area on the evening of 10th September.
As per IMD, It re-intensified into a Depression on the morning of September 11 over Northeast Madhya Pradesh and moved northwest Madhya Pradesh during 11-12 September and weakened into a well-marked low pressure area over northwest Uttar Pradesh and neighborhood on September 13.
One Deep depression over Northeast Bay of Bengal and adjoining Bangladesh during 12th Sept –19th Sept, which moved across central India and weakened into a well-marked Low Pressure Area over northeast Madhya Pradesh and adjoining southwest Uttar Pradesh on 19 September. One low pressure area formed over West central Bay of Bengal & adjoining Northwest Bay off north Andhra - south Odisha coasts which moved over to south Chhattisgarh & neighborhood across Odisha on 25th September and became less marked thereafter).
The country as a whole received excess rainfall during September mainly due to the west/north-westward movement of three low-pressure systems and their associated cyclonic circulations along the monsoon trough from the Northwest Bay of Bengal towards central India. Out of these two systems intensified into the deep depression, said IMD.
