Australian Bureau of Meteorology Reports Record-Warming El Nino and Potential Positive IOD

A powerful El Nino is actively developing in the Pacific, accompanied by continued warming expected through the spring season, according to the latest Southern Hemisphere monitoring report by the Australian Bureau of Meteorology (BoM). Climate models project that the tropical Pacific will experience further warming, likely peaking in late spring or summer.

Data shows that the relative Nino 3.4 index value for the week ending August 30 reached +2.45°C, staying well above the standard El Nino threshold of +0.80°C. Atmospheric indicators, including weakened or reversed trade winds in the western to central tropical Pacific, enhanced cloudiness in the central to eastern tropical Pacific, and reduced cloud cover over the Maritime Continent, further confirm the strength of this El Nino event. Due to its current strength and typical life cycle, the event is expected to continue into autumn 2027.

Concurrently, global sea surface temperatures have reached record-warm levels in August, surpassing previous daily records set in 2024. Sea surface temperature analyses for the week ending August 30 indicate warmer-than-average waters around much of Australia, with coastal waters along southern New South Wales and eastern and southern Tasmania registering temperatures 2 to 3°C above average.

Regarding the Indian Ocean Dipole (IOD), conditions remain neutral. The IOD index value for the week ending August 30 stood at +0.22°C. The index has maintained neutral levels for three consecutive weeks, following a three-week period where it exceeded the positive IOD threshold of +0.4°C. However, climate models continue to indicate that a positive IOD phase could still emerge during the Southern Hemisphere spring spanning September to November, though the forecast magnitude has decreased in recent model runs.

Supporting these observations, the India Meteorological Department's (IMD) monthly outlook notes that neutral IOD conditions currently prevail over the Indian Ocean. While forecasts from the Monsoon Mission Coupled Forecast System indicate neutral conditions are likely to persist through September, international climate centres suggest a potential transition to positive IOD conditions from September onwards.

In agricultural markets, the report notes that India's kharif main sowing window has closed with lower acreage recorded.

"Global climate patterns such as a strong El Nino and fluctuating Indian Ocean Dipole phases carry direct implications for macroeconomic stability, agricultural supply chains, and commodity pricing. Businesses operating in sectors like agriculture, logistics, and supply chain management must closely monitor meteorological forecasts to manage operational risks effectively and navigate potential volatility in input costs." — Dr. Shishir Gupta, Founder & CEO, StartupLanes