The advance of the southwest monsoon. May 13, 2025. Image source: Indian Meteorological Department
The Indian Meteorological Department (IMD) announced on May 13, 2025 (May 13, 2025) that the southwest monsoon has entered certain areas of the South Bay of Bangladesh, the Sea of Southern Andero, the Nicobar Islands and the Northern Andaman Sea.
Typically, the monsoon system divided into two branches takes about 10 days to reach mainland India from the region, although the IMD has not disclosed the date of the monsoon in Kerala. The agency is expected to announce an official date later this month and use a custom model for this purpose. The normal onset date of the Kerala monsoon is June 1.
Meteorologists say that early arrival to the Andaman Sea does not necessarily mean that the monsoon will arrive in Kerala earlier.
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IMD said last month that India could receive “above normal” monsoon rainfall, defined as 5% higher than the historical average of 87 cm. If that forecast holds, it will be the second year of “above normal” rainfall. Last year, India’s rainfall was 8% higher than the historical average from June to September.
In 2024, the Southwest Monsoon was set on May 30 in Kerala (Kerala) two days before the normal date and the day before the forecast date. This is also unusual for both branches in northeast India and Kerala. The two branches eventually merged in central India and maintained the southwestern monsoon until the end of September.
“The rainstorms accompanied by thunderstorms and lightning strikes may continue to be adjacent to southern and central India over the next five days, and this week’s forecast of heavy rainfall on thenercorms and Lightnning in India may be accompanied by thenerforms and Lightnning, which is within five days in India and another five days.
publishing – May 13, 2025 at 10:35 pm IST
