ENSO Transition Alert

From La Niña Fade to Neutral Dominance

WMO Global Climate Assessment • February 2026
Critical Climate Shift Underway

Weak La Niña conditions are rapidly fading as tropical Pacific indicators signal transition toward ENSO-neutral state

Context

Sea surface temperatures and atmospheric patterns show clear departure from La Niña baseline, creating uncertainty for global weather systems through mid-2026

March-May 2026 Probability Assessment

60%
ENSO-Neutral
dominant
30%
La Niña Continuation
declining
10%
El Niño Development
emerging

Seasonal Forecast Breakdown

PeriodScenarioProbabilityConfidence
Mar-May 2026ENSO-Neutral60%Moderate
Mar-May 2026La Niña30%Low
Mar-May 2026El Niño10%Very Low
WMO Global Producing Centres consensus forecast

Forecast Uncertainty Indicators

Model Agreement65%
Ensemble Spread85%
SST Variability75%

Pacific Ocean-Atmosphere Interactions

  • Sea surface temperatures shifting from La Niña cooling patterns
  • Atmospheric circulation responding to oceanic thermal changes
  • Trade wind patterns weakening across tropical Pacific belt
  • Walker circulation showing signs of neutral configuration
  • Thermocline depth adjustments indicating ENSO state transition
  • Equatorial upwelling patterns returning to baseline conditions
Expert Assessment
“El Niño and La Niña are not the only factors that drive global and regional climate patterns, and the magnitudes of ENSO indicators do not directly correspond to the magnitudes of their impacts.”
— World Meteorological Organization Climate Assessment
Agricultural System Disruption Warning

ENSO transitions create crop planning chaos for farmers, destabilize global agricultural systems, and drive food prices beyond reach for vulnerable populations worldwide

Cascading Consequences

  • Extreme weather events intensify during ENSO transitions
  • Millions face displacement from crop failures and disasters
  • Coastal communities prepare for storm pattern changes
  • Food-insecure populations confront affordability collapse
  • Regional climate patterns shift unpredictably
  • Agricultural planning becomes increasingly uncertain

Regional Impact Scenarios

Pacific Rim

Coastal storm patterns shift

  • Typhoon intensity changes
  • Monsoon timing disruption
  • Fisheries productivity impacts

Americas

Agricultural zones face uncertainty

  • Drought risk in western regions
  • Flooding potential increases
  • Crop yield variability

Global South

Food security vulnerabilities

  • Price volatility acceleration
  • Supply chain disruptions
  • Humanitarian crisis potential

Critical Monitoring Parameters

  • Tropical Pacific sea surface temperature anomalies
  • Atmospheric pressure differentials across Pacific basin
  • Trade wind strength and directional consistency
  • Ocean subsurface temperature profile changes
  • Precipitation pattern shifts in key indicator regions
  • Model ensemble convergence and divergence trends

Forecast Limitations

Substantial uncertainty exists in current projections due to widespread disagreement among tropical Pacific sea surface temperature forecasts across models and ensemble members

Sources & References

  • World Meteorological Organization (WMO) Global Producing Centres - ENSO Forecast Consensus, February 2026
  • WMO El Niño/La Niña Updates - https://wmo.int/publication-series/el-ninola-nina-updates
  • WMO Climate into the 21st Century - Typical Circulation Patterns During El Niño/La Niña (2003)
  • Tropical Pacific Sea Surface Temperature Analysis - Multi-model Ensemble Assessment
  • Regional Climate Impact Assessment - ENSO Transition Consequences Analysis