The India Meteorological Department (IMD) has forecasted a slight increase in rainfall across Kerala due to a depression over the Bay of Bengal, prompting yellow alerts for specific districts.

  • Yellow alert issued for Kasaragod, Kannur, Ernakulam, and Kottayam for August 18.
  • A depression over coastal West Bengal and Bangladesh is driving the weather change.
  • Light to moderate westerlies are expected to enhance rainfall over the next four days.

The India Meteorological Department (IMD) has announced a projected revival of the southwest monsoon over Kerala, following a period of relatively weak precipitation. This shift in weather patterns is being attributed to a significant atmospheric disturbance currently active over the Bay of Bengal, which is expected to influence weather systems across southern India.

According to the official weather bulletin released on Monday, a low-pressure area that had previously formed over the northwest Bay of Bengal has intensified into a depression. This system is currently concentrated over coastal West Bengal and adjoining regions of Bangladesh. Meteorological models indicate that the system will move north-northwestwards, traversing through Gangetic West Bengal, Jharkhand, and Bihar over the next 24 hours.

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Why This Matters

BozokMedia analysis shows that while the depression is centered far to the north, its ripple effect creates a vacuum that draws light to moderate westerlies and northwesterlies into the lower tropospheric levels of Kerala and Lakshadweep. This atmospheric steering is crucial for maintaining groundwater levels and supporting the agricultural cycle in the region after a dry spell.

The interaction between distant depressions in the Bay of Bengal and the local tropospheric winds often dictates the intensity of the monsoon's second wave in the southern peninsula.

For Tuesday, August 18, the IMD has specifically issued a yellow alert for four districts: Kasaragod, Kannur, Ernakulam, and Kottayam. Residents in these areas are warned of isolated heavy rainfall, which could lead to localized waterlogging or disruptions in daily commutes.

Historical Background

Kerala's monsoon patterns are traditionally characterized by high variability. The southwest monsoon, which typically begins in June, often experiences 'breaks' where rainfall diminishes significantly. The revival of rains via Bay of Bengal systems is a common phenomenon that often prevents drought-like conditions during the mid-monsoon phase.

Did You Know?: Kerala is usually the first state in India to receive the onset of the Southwest Monsoon, acting as the gateway for the rainy season across the subcontinent.

Frequently Asked Questions

Q1: Which districts are under the yellow alert?
The yellow alert is active for Kasaragod, Kannur, Ernakulam, and Kottayam.

Q2: What is causing the increase in rainfall?
The rainfall is being driven by a depression over coastal West Bengal and the northwest Bay of Bengal, which is influencing wind patterns in the lower troposphere.