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The Ocean Event That Can Change the World's Weather

2026.10.26
Image: Ben Mack @ Pexels


When we think about weather, we usually look at the sky. However, one of the most important influences on weather can be found thousands of kilometres away, under the surface of the Pacific Ocean. It is called El Niño, and scientists are watching it carefully this year.

El Niño happens when parts of the tropical Pacific Ocean become unusually warm. Normally, strong winds called trade winds push warm surface water from the eastern Pacific towards Asia. This allows cooler, deeper water to rise near South America. During El Niño, the trade winds become weaker. Warm water moves east, and the temperature of the Pacific Ocean can rise significantly.

Why does this matter to people living far away from the Pacific? The ocean and atmosphere are closely connected. When a large area of the ocean becomes warmer, it changes where heat and moisture enter the atmosphere. This can change wind patterns and the position of the jet stream. As a result, El Niño can influence rainfall and temperatures in many parts of the world.

The effects are not the same everywhere. Some areas may receive much more rain, while others experience drought. Australia and Indonesia, for example, often become drier during El Niño. Parts of South America can experience unusually heavy rain. In the United States, El Niño can influence winter temperatures and rainfall, although the exact effects vary from one event to another.

This year's event is attracting particular attention. In September 2026, NOAA reported that El Niño was strengthening. Sea-surface temperatures in parts of the eastern tropical Pacific were more than 3°C above average, and forecasters gave a greater than 90% chance of a very strong El Niño during the Northern Hemisphere autumn and winter.

Scientists cannot predict exactly what the weather will be in every country. El Niño is only one influence on weather, and every El Niño is different. However, scientists can use ocean measurements, satellites and computer models to identify patterns and make seasonal forecasts.

El Niño reminds us that the world's weather is connected. A change in ocean temperature in one part of the Pacific can influence farmers, fishermen, governments and ordinary people on the other side of the planet. Sometimes, to understand tomorrow's weather, we need to look not at the sky, but at the ocean.

Vocabulary

  • unusually — differently from what is normal

  • trade winds — regular winds that blow across tropical areas

  • drought — a long period with little or no rain

  • jet stream — a fast-moving current of air high in the atmosphere

  • forecast — a prediction about future weather or events

  • influence — to affect something

Comprehension Questions

  1. What normally happens to warm Pacific Ocean water because of the trade winds?

  2. Why can El Niño affect weather in countries far from the Pacific Ocean?

  3. What are scientists expecting from the 2026–27 El Niño?

  4. Why can't scientists predict exactly what the weather will be in every country?



















Answers


1. They push warm water from Asia to the pacific
2. The ocean and atmosphere are closely connected
3. They think this year will be paricularly strong
4. El Nino is only one influence on the weather

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