The El Niño phenomenon and its impact on Saudi Arabia: a hot summer and potential floods
The Regional Center for Climate Change has warned of the potential repercussions of the developing El Niño climate phenomenon in the coming months, which could lead to a hotter-than-usual summer and increased risk of flash floods in western Saudi Arabia. These warnings are based on the latest reports and observations indicating a high probability of Pacific Ocean surface temperatures exceeding normal levels, foreshadowing significant changes in weather patterns globally and regionally.
What is the El Niño phenomenon and how does it form?
The El Niño phenomenon is part of a natural climate cycle known as the Southern Oscillation (ENSO), a fluctuating pattern in tropical Pacific Ocean surface temperatures and surface winds. During an El Niño phase, the east-west trade winds weaken, allowing warm water to accumulate off the coast of South America and spread eastward. This unusual warming of the ocean surface releases enormous amounts of heat into the atmosphere, disrupting global weather patterns and causing droughts in some areas and floods and flash floods in others.
Historically, strong El Niño years, such as those of 1997-1998 and 2015-2016, have been associated with extreme weather events around the world, including record-breaking heat waves, severe hurricanes, and changes in rainy seasons, significantly impacting agriculture, water, and the global economy.
The expected impact of the El Niño phenomenon on the Kingdom's climate
According to the report issued by the center, current indicators suggest a gradual increase in temperature differences above the normal average. The report explained that the El Niño 3.4 index, the main measure of the phenomenon, is trending towards positive values that could exceed the +0.8°C threshold, the official threshold for the start of El Niño conditions. Forecasts indicate an upward trajectory for these temperature differences, reaching their peak during the upcoming autumn and winter seasons.
These shifts have direct repercussions on the local climate map, most notably:
- Hotter summer and autumn: Average maximum and minimum temperatures are expected to rise significantly, increasing the severity of heat waves during the summer and autumn seasons.
- Increased chances of heavy rainfall: The chances of rainfall exceeding normal levels are likely to increase in the western parts of the Kingdom, specifically during the autumn months (September, October, November), which raises the risk of flash floods.
- Warmer winter: The overall rise in temperatures reduces the likelihood of severe cold waves during the coming winter season.
Preparations and upcoming challenges
The anticipated climate changes present challenges and necessitate enhanced preparedness. Increased rainfall in western regions, while potentially beneficial for replenishing water resources, requires infrastructure capable of managing flash floods to mitigate risks. Similarly, extreme heat waves have significant health and economic impacts, demanding intensified awareness campaigns and the implementation of necessary preventative measures. The report emphasized the inherent uncertainty in numerical models, underscoring the importance of continuous monitoring and updates to ensure timely and appropriate decision-making.
