A tale of two oceans: Atlantic punishing Europe, Pacific penalising India

A warming Atlantic is intensifying heat domes across Europe and North America, while a strengthening El Nino is weakening India's southwest monsoon. The twin ocean shifts are driving dangerous heat, a 42 per cent rainfall deficit and growing stress across regions.

In Short

• North Atlantic warmth is intensifying high pressure systems and trapping extreme heat
• Temperatures have crossed 40 degrees Celsius across several southern European countries
• US forecasters warn the same pattern could peak around Independence Day

Two oceans, thousands of kilometres apart, are shaping the weather fortunes of billions of people this summer.

While the warming Atlantic Ocean is helping fuel intense heat domes that have pushed temperatures to dangerous levels across Europe and North America, the Pacific Ocean is simultaneously steering a developing El Nino that has disrupted India's southwest monsoon, leaving the country grappling with one of its worst rainfall deficits in years.

Together, the two oceans have become the dominant forces behind a season of unprecedented weather extremes stretching from New Delhi to New York.

HOW IS THE ATLANTIC OCEAN FUELLING THE HEATWAVE IN EUROPE, US?

Across Europe, an early and intense heatwave has sent temperatures soaring past 40 degrees Celsius in Spain, Portugal, Italy and parts of France.

The same atmospheric pattern is expanding westward, with meteorologists warning that a strengthening heat dome could bring record-breaking temperatures to large parts of the United States during the Fourth of July holiday.

A heat dome forms when a persistent area of high atmospheric pressure traps hot air near the surface. The sinking air compresses and warms, while clear skies allow uninterrupted sunshine to bake the ground.

As the land dries out, less energy goes into evaporation and more into heating the air, creating a self-reinforcing cycle of extreme temperatures.

Scientists say unusually warm sea surface temperatures in the North Atlantic are adding extra moisture and heat to the atmosphere, strengthening the ridge of high pressure that supports these heat domes. The result is prolonged, widespread heat with little opportunity for cooling.

On the other side of the globe, the Pacific Ocean is telling a very different story.

HOW IS PACIFIC OCEAN SWALLOWING INDIAN MONSOON?

A strengthening El Nino has altered atmospheric circulation over the tropics, weakening the monsoon winds that normally carry moisture from the Arabian Sea and the Bay of Bengal into the Indian subcontinent.

The delayed and sluggish advance of the southwest monsoon has left vast parts of India with a massive rainfall deficit of 42 per cent through June 2026.

Meteorologists say the monsoon has not disappeared, but its engine has weakened. Reduced cross-equatorial winds, suppressed cloud formation and shifting tropical convection associated with El Nino have prevented rain-bearing systems from penetrating deep into central and northern India.

The consequences are already visible. Reservoir levels are falling, agricultural regions are anxiously awaiting rainfall, and cities such as Delhi have endured prolonged heatwave conditions, with humidity rising even as cooling rains remain absent.

Although the Atlantic and Pacific operate independently, both are responding to a warmer climate. Rising ocean temperatures increase the amount of heat and moisture exchanged with the atmosphere, amplifying existing weather patterns.

For billions of people across Asia, Europe and North America, this summer has become a reminder that oceans are not just passive water bodies, they are Earth's climate engines.

When they warm, the atmosphere responds, often with devastating consequences, whether through blistering heat domes over the West or a monsoon that struggles to arrive in the East.

- Ends