The article explains how scientists are monitoring the tropical Pacific to assess the strength of El Niño, with a focus on the Niño3.4 region. A predicted “very strong” event could have significant impacts on global and regional weather patterns, temperatures, and risk factors in the coming year.
Forecast consensus: a very strong El Niño on the horizon
Forecasters across major agencies are converging on the view that a very strong El Niño is likely this year. The consensus comes from ECMWF, NOAA, and Australia’s BoM, with multiple ECMWF model runs projecting the Niño3.4 sea surface temperature anomaly to rise well above +2.5°C by autumn.
Some forecasts even suggest values exceeding +3.0°C, a level not seen since the late 19th century, though historical observations from that era are uncertain. The last time a very strong El Niño occurred was in 2015–16, when the November–January Niño3.4 anomaly reached +2.4°C.
These projections are framed in terms of a three-month average temperature anomaly in the tropical Pacific. A strong El Niño is defined as exceeding +1.5°C, while a very strong event signals more intense and far-reaching climatic impacts.
The current trajectory suggests rapid warming in the equatorial Pacific. This would set the stage for substantial global effects next year.
What the Niño3.4 metric means
The Niño3.4 region—centered in the central equatorial Pacific—serves as the primary gauge for El Niño strength. Forecasters monitor a three-month average anomaly in sea surface temperature, because longer timescales smooth short-lived fluctuations and reveal sustained warming or cooling trends.
When Niño3.4 anomalies exceed +1.5°C, El Niño is classified as strong; values above +2.5°C indicate a very strong event with heightened climate consequences. While model runs show a potential exceedance of +3.0°C, such figures must be interpreted with caution given uncertainties in historical analogs and regional feedbacks.
Global temperature implications
Historically, strong El Niño events tend to lift global average temperatures by roughly 0.2°C. With a very strong event on the table, scientists warn that next year could bring record-high global temperatures as the extra heat content mixes into the atmosphere and oceans.
The magnitude and character of cooling and warming patterns will depend on how long the El Niño persists and how it interacts with other climate systems. The potential for a notable temperature spike is a central concern for climate monitors and policymakers.
Regional impacts to watch
Regional weather responses during a very strong El Niño are diverse and geographically uneven. Observations from past events help frame likely outcomes, though each Niño is unique.
Expected regional patterns include flooding risks in some parts of South America and East Africa, altered rainfall in Central Asia, and heightened drought and fire risk across other tropical regions.
- South America: Northern Peru and southern Ecuador often experience increased rainfall and the potential for flooding, landslides, and related hazards during strong to very strong Niño events.
- East Africa and Central Asia: Some regions may see shifts toward wetter conditions, with elevated flood risk in certain basins and seasonal rainfall anomalies that stress water management systems.
- Australia, Indonesia, and northern South America: These areas commonly face heightened drought and wildfire risk, challenging agriculture and air quality management.
- Atlantic hurricane activity: El Niño typically suppresses Atlantic hurricane formation, contributing to a quieter-than-average season. Reduced rainfall from weaker systems can worsen drought conditions in Central America by cutting a vital rainfall source, with knock-on effects for agriculture and food security.
Hurricane activity and drought trade-offs
While a muted Atlantic hurricane season is often anticipated during El Niño, the accompanying shifts in rainfall can exacerbate drought in other regions.
This underscores the importance of holistic planning for water resources, crops, and wildfire risk as climate patterns shift with a very strong El Niño.
Uncertainty and unique patterns
Scientists emphasize uncertainty: even as consensus points toward a very strong event, the exact pattern, duration, and reach of disruptions will vary.
Each El Niño modifies atmospheric circulation in distinct ways, influencing rainfall distribution, monsoon strength, and regional climate extremes.
Continuous monitoring and updating forecasts remain essential to managing the diverse impacts.
What to expect next year: key takeaways
- Global temperatures likely to show an uptick, with a risk of record warmth depending on El Niño duration and intensity.
- Regional rainfall changes will be uneven, with heightened flood risk in some areas and drought and wildfire risk in others.
- Atlantic hurricane activity expected to be lower than average, but drought implications in Central America could worsen food security concerns.
- Preparedness needs will include water resource management, agricultural adaptation, and risk communication for affected regions.
Researchers will continue to refine models, quantify uncertainties, and translate forecasts into actionable guidance for governments, farmers, and communities worldwide.
Here is the source article for this story: Record global temperatures possible as chance of a ‘super El Niño’ grows