El Nino's looming presence over Singapore is set to bring a host of weather-related challenges, with the Meteorological Service Singapore (MSS) predicting a warmer and drier climate in the second half of the year. This development raises concerns about the potential for transboundary haze, a familiar yet ever-present threat to the city-state's air quality. The upcoming El Nino event, with a more than 80% chance of occurrence in 2026, is expected to have a significant impact on Singapore's rainfall patterns, particularly during the Southwest Monsoon season from June to September. This is a critical period for the country, as El Nino events have historically led to dry conditions, with rainfall in 2015 being about 35% below the long-term average.
What makes this situation particularly intriguing is the potential interplay between El Nino and a positive Indian Ocean Dipole (IOD). The MSS notes that Singapore and its surroundings tend to experience drier conditions when sea surface temperatures in the eastern Indian Ocean are cooler, leading to less cloud formation. This phenomenon, combined with El Nino, could result in a prolonged dry season, potentially extending into October. The last time both El Nino and a positive IOD occurred together, in 1997, it led to Singapore's driest year on record.
The implications of these weather patterns are far-reaching. Drier and warmer conditions increase the likelihood of peatland and vegetation fires in the region, which, if located near Singapore, could result in transboundary haze. This is a serious concern, as the smoke and haze can significantly deteriorate air quality, posing health risks to the population. The MSS warns that the hotspot and smoke haze situation in the surrounding region could escalate from June, emphasizing the need for preparedness.
The Haze Task Force, chaired by the National Environment Agency (NEA), has taken proactive measures to address this issue. With 28 government agencies under its umbrella, the task force is ready to activate response plans if air quality deteriorates. Members of the public are advised to monitor real-time air quality through 1-hour PM2.5 readings and refer to the 24-hour Pollutant Standards Index (PSI) for health advisories. Additionally, they are encouraged to ensure their air purifiers are in working condition and follow official advisories via NEA's website, the myENV app, and social media channels.
In my opinion, the upcoming El Nino event and its potential interaction with a positive IOD highlight the complex and dynamic nature of weather patterns in the region. While the MSS provides valuable insights, it is essential to recognize the broader implications and the need for proactive measures to mitigate the impact on air quality and public health. As Singapore navigates this challenging period, the focus should be on preparedness, monitoring, and adapting to the ever-changing weather landscape.
