How will El Niño affect rainfall in the US and Indian subcontinent?

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El Niño's Projected Impact on Rainfall Patterns

The El Niño phenomenon is expected to bring contrasting rainfall patterns to different regions, with an anticipated increase in precipitation for the southwestern United States and a decrease for the Indian subcontinent. These forecasts are based on the rapid development and strengthening of El Niño, which is projected to reach a strong event classification between July and September. This intensification increases the probability of various extreme weather events globally.
Above-Normal Rainfall in the Southwestern US

Forecasts indicate that the southwestern United States is likely to experience rainfall levels exceeding normal conditions during the El Niño period. This prediction aligns with the broader expectation of significant changes in global weather patterns driven by the warming of surface temperatures in the central and eastern equatorial Pacific Ocean. These temperature anomalies are expected to exceed 2°C in key monitoring regions, providing high confidence in the outlook for altered precipitation.
Below-Normal Rainfall Across the Indian Subcontinent

Conversely, the Indian subcontinent is anticipated to receive less rainfall than is typical for the season. This reduction in precipitation is a direct consequence of the shifting atmospheric and oceanic conditions associated with El Niño. The World Meteorological Organisation (WMO) has highlighted that such patterns are consistent with a strengthening El Niño, which influences global wind and pressure systems, thereby impacting rainfall distribution.
Global Implications of El Niño Intensification

The WMO has warned that the rapid development into a strong El Niño event will amplify the chances of both drought and heavy rainfall in various parts of the world. This includes an increased risk of heatwaves on land and marine heatwaves. The agency is enhancing its early warning support to assist in preparedness efforts, particularly in sectors highly sensitive to climate variations like agriculture and health.
Amplified Effects Due to Climate Change

While the WMO states there is no evidence that climate change increases the frequency or intensity of El Niño events themselves, it is believed that climate change can amplify their effects. A warmer ocean and atmosphere provide more energy and moisture, which can intensify extreme weather events such as heatwaves and heavy rainfall. This interaction suggests that the impacts of this El Niño event could be more severe than in previous occurrences.

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How will El Niño affect rainfall in the US and Indian subcontinent?

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