India faces a dual climate threat: the IMD has issued heat‑wave alerts for the north, centre and east, while the NOAA expects a strong ENSO warm phase (El Niño) to develop from May‑July 2026 and persist through the year.
Key Developments
- May‑July 2026: NOAA’s monthly ENSO update (11 May) signals a high probability of El Niño formation, potentially a Super El Niño this year.
- April 2026: IMD projects monsoon rainfall at only 92 % of the long‑period average (LPA 87 cm), similar to the 2015‑16 Super El Niño season.
- Heat‑wave risk: A fresh Western Disturbance may intensify the ongoing heatwave, raising temperature and fire hazards.
Important Facts about ENSO
ENSO has three phases: El Niño (warm), La Niña (cold) and Neutral. Under normal (neutral) conditions, trade winds push warm water westward, causing upwelling of cold, nutrient‑rich water off South America. During El Niño, weakened trade winds allow warm water to pool in the central/eastern Pacific, shifting the low‑pressure zone eastward (Southern Oscillation) and disrupting global weather.
Monitoring relies on three indices:
- ONI: SST anomaly ≥ +0.5 °C signals El Niño.