June 10, 2022
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First week of Southwest Monsoon records large deficit

For central India, it was minus 90 per cent of its LPA while for south peninsula, it is minus 30 of its LPA. For east and northeast, it is minus 2 per cent of LPA…reports Asian Lite News

The slow progress of Southwest Monsoon has meant that the all India cumulative rainfall during this year’s monsoon first week — between June 1 to 8 — is minus 42 per cent (large deficit), the Extended Range Forecast issued by the IMD said on Thursday.

Among the regions, the rainfall over northwest India is below LPA by minus 94 per cent, minus 88 per cent for central India, minus 26 per cent for south peninsula and little better, yet deficit of minus 7 per cent below the LPA for east and northeast India, the India Meteorological Department (IMD) data showed.

During the week between June 2 and 8, for the country as a whole, the weekly cumulative all India rainfall departure from its long period average (LPA) was minus 42 per cent with weekly cumulative over northwest India being minus 96 per cent of its LPA. For central India, it was minus 90 per cent of its LPA while for south peninsula, it is minus 30 of its LPA. For east and northeast, it is minus 2 per cent of LPA.

Starting this year, the IMD has introduced the new rainfall normal – called as the LPA, the Long Period Average – based on rainfall data from 1971-2020 for the southwest monsoon season replacing the current rainfall normal that was based on data from 1961-2010.

From Thursday onwards, the IMD is expecting regular advancement of SW monsoon as the Extended Range Forecast said that conditions are favourable for advancement of SW monsoon over some more parts of east India and some parts of central India by June 15. It also said that the southwest monsoon is likely to advance over some more parts of east and central India and some parts of Uttar Pradesh by June 22.

Conditions favourable

After almost a week of slow progress, conditions are favourable for the advancement of the Southwest Monsoon, the India Meteorological Department (IMD) said on Thursday.

Against the normal progress when it reaches Maharashtra at this time, the crucial for agriculture SW Monsoon had on Tuesday advanced over more parts of Tamil Nadu, Puducherry, Karaikal, southwest, and west-central Bay of Bengal.

Now, the IMD said on Thursday that the Northern Limit of Monsoon (NLM) continued to pass through Karwar, Chikmagaluru, Bengaluru, and Puducherry on the one side and Siliguri on the other side.

“Conditions are favourable for further advance of monsoon into some more parts of central Arabian sea, Goa, some parts of south Maharashtra, some more parts of Karnataka, remaining parts of Tamil Nadu, some parts of south Andhra Pradesh, some more parts of west central & northwest Bay of Bengal during next 48 hours,” the IMD forecast said.

Conditions would continue to become favourable for further advance of monsoon into more parts of Maharashtra, entire Karnataka, more parts of Andhra Pradesh and more parts of west central and northwest Bay of Bengal during subsequent two days.

Conditions would likely to become favourable for further advance of monsoon into some more parts of east India and some parts of central India towards end of the IMD’s forecasting week, i.e., around June 15.

On Tuesday, a senior IMD meteorologist had said that between May 31 and that day, there were no major systems (to drive the monsoon rainfall) and had said that the winds were supportive for rainfall over peninsular southern India for advance of monsoon.

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