El Niño
The warm phase of ENSO: warmer-than-average Pacific Ocean surface temperatures that disrupt global rainfall patterns, drive drought across three continents, and create measurable commodity price shocks within 2–6 months.
What is El Niño?
El Niño occurs when sea surface temperatures in the central and eastern equatorial Pacific Ocean (Niño 3.4 region: 5°N–5°S, 120°–170°W) exceed the long-term average by 0.5°C or more for at least 5 consecutive overlapping 3-month periods. This warming weakens the trade winds, suppresses the thermocline in the western Pacific, and fundamentally alters the Walker Circulation — the atmospheric engine that drives global rainfall distribution. The result is drought where there should be rain, and rain where there should be drought — across three continents simultaneously.
Agricultural and Commodity Impacts
Commodity Market Effects
El Niño events create measurable commodity price impacts within 2–6 months of onset. The 2023–24 El Niño — the strongest in 40 years — drove the following commodity price movements:
- Rice: +8.3% within 6 months — Pacific supply chain disruption and SE Asia production shortfalls
- Coffee: +12.4% — East Africa and Central America dual production stress
- Soybeans: +6.1% — Amazon drought reducing Brazilian production
- Wheat: +4.2% — Australian drought and South Asian monsoon weakness
- Palm oil: +9.2% — Indonesian and Malaysian production disrupted by wildfire
Food Security Implications
El Niño is one of the most powerful drivers of acute food insecurity globally. The 2015–16 El Niño triggered the worst food crises in East Africa, Southern Africa, and the Pacific in a generation. The 2023–24 event contributed to IPC Phase 4 Emergency conditions across the Horn of Africa and parts of Southern Africa. Populations dependent on rain-fed agriculture in ENSO-sensitive regions face compound risk: reduced production, higher prices, and reduced purchasing power simultaneously.
How We Track It
El Niño One Wave monitors the ONI index using NOAA CPC data updated monthly. The live platform shows the current ENSO phase, the 11-year ONI chart, and real-time agricultural temperature anomalies across 6 global monitoring regions that allow early detection of ENSO-phase crop stress.
Full methodology: elnino-onewave.pages.dev/methodology