The arrival of India’s southwest monsoon, which was initially predicted to begin on May 26, has been postponed due to unexpected cyclonic activity over the Bay of Bengal. This system has altered the large-scale wind patterns essential for the monsoon’s progression. The India Meteorological Department (IMD) has revised its forecasts, indicating that the much-anticipated monsoon rains may not reach Kerala until between June 2 and June 4.

As India endures one of its hottest summers in recent years, the delay is more significant than it seems. The monsoon holds critical importance for the nation’s ecosystems and its vast population, supplying around seventy-five per cent of India’s annual precipitation. It serves as essential support for the agricultural sector, which employs nearly half of the country’s workforce.

Impact of Cyclone on Monsoon Patterns

The Bay of Bengal, located off India’s eastern coast, is the origination point for one arm of the monsoon that typically moves westward across the subcontinent. When a cyclone develops in this region, it draws winds towards itself, disrupting the overarching flow required for the monsoon to advance northward. This phenomenon of cyclonic activity often weakens the monsoon’s intensity, causing unexpected delays, as witnessed this year. The unique timing of this cyclone has postponed the monsoon beyond its expected arrival.

Historically, cyclonic events have caused similar delays in the monsoon, as seen in 2013 and 2021. However, the occurrence of this cyclone directly before an already advanced forecast has shifted the expected timeline. Hence, the monsoon’s arrival has been officially rescheduled.

Despite the broader delay in the monsoon for much of the nation, Kerala continues to experience rainfall. These showers, classified as pre-monsoon rains, are significant yet do not meet the official criteria required by the IMD for declaring the monsoon’s onset.

Conditions for Official Monsoon Onset

The IMD is closely monitoring weather conditions in Kerala to declare the monsoon officially. This declaration is based on specific criteria, which include at least sixty per cent of Kerala’s fourteen designated weather stations reporting 2.5 mm or more of rainfall for two consecutive days, along with predefined wind speed and cloud cover conditions. Until these standards are met, the existing rainfall in Kerala will not be classified as part of the official monsoon.

Currently, while the monsoon has a normal expected start date of June 1, this year’s circumstances have shifted the timeline. Typically, such delays may not cause alarm for most citizens, but 2026 deviates from usual patterns. Central, western, and northern regions of India continue to face extreme heat, eagerly awaiting the cooler temperatures that overcast skies and rainfall typically bring.

Adding to the complexities, the IMD has indicated that the overall seasonal rainfall for this year could be below average due to the predicted impacts of El Niño. Although the arrival of the monsoon is confirmed, its effectiveness in alleviating drought conditions remains uncertain.

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