The Strongest El Nino in a Century: Understanding Its Impact

The strongest El Nino event in a century is forming in the Pacific Ocean, threatening to disrupt global weather patterns. Scientists warn that this year could see one of the most intense El Nino events in history.

According to Paul Roundy, a professor of atmospheric and environmental sciences at the State University of New York at Albany, there is a real potential for the strongest El Nino event in 140 years.

The World Meteorological Organization (WMO) predicts that El Nino conditions will emerge soon and persist at least until winter.

The phenomenon can trigger droughts, floods, heatwaves, and disruptions to food and water supplies in various regions, depending on its strength and duration.

"The world should treat this as an urgent climate warning. El Nino will exacerbate global warming," said United Nations Secretary-General Antonio Guterres.

El Nino is a natural climate pattern that occurs every two to seven years. It begins when the trade winds over the tropical Pacific weaken, allowing warm water to accumulate in the Pacific Ocean.

Although the warming area is roughly the size of the United States and occurs in one region, its impact can be felt worldwide.

"By changing the tropical atmosphere, it can then change the atmosphere in more distant regions, in the middle latitudes, which is why we pay close attention to this phenomenon even if we are thousands of miles away," said Gavin Schmidt, director of NASA's Goddard Institute for Space Studies.

This triggers a global chain reaction, with El Nino becoming the "first atmospheric domino to fall," he added.

The impact of El Nino varies greatly from region to region. In some areas, it can increase the risk of drought, while in other areas, it can lead to floods.

Certain parts of Central America, Asia, Africa, and Australia often become hotter and drier during El Nino years.

Warnings are primarily issued due to the risk of water scarcity caused by El Nino. Reduced water supply can affect agriculture, hydroelectric power generation, and drinking water supply.

In Honduras, authorities estimate that around 75 urban areas could face severe drought conditions. The capital city, Tegucigalpa, has already declared a state of water emergency.

In other parts of the world, the risks are reversed. In some coastal areas of South America, El Nino can bring heavy rainfall and flooding.

The impact can last long after the rains have stopped or the reservoirs have dried up.

El Nino is often associated with crop failures and potential economic losses of trillions of dollars. During the 2015-2016 El Nino event, poor harvests left millions of people worldwide in need of food aid.

Wildfires are also a growing concern. Scientists warn that El Nino could increase the risk of extreme heat and drought, leading to wildfires in regions such as Australia, Canada, the United States, and the Amazon rainforest.

El Nino plays a significant role in tropical storm activity. Scientists predict that this year's Atlantic hurricane season will be less active than average.

El Nino conditions tend to increase wind shear over the Atlantic, making it more difficult for storms to form and intensify.

However, fewer storms do not necessarily mean reduced danger. Once a storm reaches hurricane strength, it becomes more challenging to suppress. This means that the storms that do form can still cause significant damage.

The situation is different in the Pacific, where El Nino tends to have the opposite effect, triggering more and stronger storms.

Marine ecosystems are also under pressure. Warmer ocean temperatures due to El Nino can cause coral bleaching and add stress to already weakened coral reefs due to repeated heat exposure from climate change.

The agricultural sector is also affected. In India, mango farmers reported a drastic decline in yields after unusual weather conditions disrupted the flowering and fruit development process, affecting both supply and farmers' income.

Scientists say there is no strong evidence to suggest that climate change directly causes El Nino to become stronger. However, climate change can exacerbate its impact.

"Climate change can turn severe droughts caused by El Nino into extreme droughts," said Michael McPhaden, a senior scientist at the National Oceanic and Atmospheric Administration (NOAA).

A warmer atmosphere can hold more moisture, increasing the risk of extreme rainfall and flooding.

Additionally, higher temperatures can worsen droughts by evaporating soil moisture more quickly.

With global temperatures already nearing record highs, an El Nino event can easily push the Earth's temperature to a record high.

One of the benefits of El Nino is that it develops gradually and can be monitored months in advance.

Scientists can track ocean temperatures and atmospheric conditions, giving governments and communities time to prepare. Weather forecasts can help authorities protect crops, strengthen flood defenses, and improve early warning systems.

"We know where unusual rainfall or drought will occur," said McPhaden. "There is a lot of time available through these long-term weather forecasts to develop mitigation strategies to avoid some of the worst impacts."