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Environment & Climate16 Oct 2026 · about 6 min

El Niño Peaks, Unusually Warm Winter, Southern Region Faces Severe Drought and Saltwater Intrusion

The brief

Southern Vietnam is facing a linked crisis: drought and saltwater intrusion. El Niño has reached its peak, bringing unusually warm winter conditions and making freshwater harder to secure. Drought reduces rain and river flows. Saltwater then moves farther inland, contaminating canals, wells, and irrigation water. That directly affects households, farms, and local water systems. Families may have less drinkable water. Farmers may struggle to irrigate crops or protect harvests. The problem becomes especially serious when dry conditions meet high tides, because less freshwater pushes back against seawater. Reports say El Niño may remain very strong through January 2027, so pressure could continue. Southern Vietnam may therefore need careful water storage, reduced waste, and closer salinity monitoring. For farmers, practical choices may include adjusting planting and irrigation, while communities prepare backup freshwater supplies.

01

What is happening in southern Vietnam, and how do drought and saltwater intrusion affect people, farms, and freshwater supplies?

Southern Vietnam is facing a linked crisis: drought and saltwater intrusion. El Niño has reached its peak, bringing unusually warm winter conditions and making freshwater harder to secure. Drought reduces rain and river flows. Saltwater then moves farther inland, contaminating canals, wells, and irrigation water.

That directly affects households, farms, and local water systems. Families may have less drinkable water. Farmers may struggle to irrigate crops or protect harvests. The problem becomes especially serious when dry conditions meet high tides, because less freshwater pushes back against seawater.

Reports say El Niño may remain very strong through January 2027, so pressure could continue. Southern Vietnam may therefore need careful water storage, reduced waste, and closer salinity monitoring. For farmers, practical choices may include adjusting planting and irrigation, while communities prepare backup freshwater supplies.

02

What is El Niño, and how is it identified in the tropical Pacific Ocean?

El Niño is a recurring warming of surface waters across the central and eastern tropical Pacific Ocean. It matters because this ocean shift changes winds, clouds, and rainfall far beyond the Pacific, affecting storms, drought, agriculture, and health. Scientists identify it when sea-surface temperatures remain unusually warm for months, with weaker trade winds and disrupted ocean circulation.

In the episode described by the source, El Niño reached a very strong intensity and peaked around the current period. The warmer eastern Pacific transfers heat into the atmosphere, while weakened winds alter normal moisture patterns. This helps explain reports of fewer storms, possible mid-rainy-season dryness in Central Vietnam, and severe drought and saltwater intrusion in the South.

Reports say the event could remain very strong through January 2027, while winter may be unusually warm. VTV also reports that more than 347 million children worldwide risk impacts from a strong El Niño. Identifying Pacific warming early helps governments prepare water supplies, farming plans, disaster responses, and health protections.

03

What does it mean to say that El Niño has peaked, and how can it still remain very strong through January 2027?

“Peaked” means El Niño has reached its highest strength, not that it has suddenly ended. Afterward, it can weaken gradually while remaining unusually powerful for months, so its effects continue.

The current event is linked with an unusually warm winter, fewer storms, and possible rainfall shortages in central Vietnam. In southern Vietnam, drought and saltwater intrusion could become severe, damaging water supplies and farms. El Niño changes ocean-atmosphere circulation, which shifts rainfall and storm patterns.

Reports say El Niño remains very strong through January 2027, even after its peak has passed. That means risks may ease gradually, rather than disappear, while more than 347 million children face possible impacts worldwide. This calls for planning now, while ASEAN governments discuss coordinated responses to the continuing risks.

04

How many children and how large a region could be affected by this unusually strong El Niño?

More than 347 million children could face impacts from this unusually strong El Niño. The risk covers East Asia and the Pacific, a vast region exposed to weather and climate disruptions. El Niño is a warming of Pacific Ocean waters that shifts rainfall and storm patterns.

In Vietnam, the effects are already becoming clearer. Southern provinces face severe drought and saltwater intrusion, while central Vietnam could experience rainfall shortages during its rainy season. Fewer storms may also leave some areas drier than usual.

The source reports that El Niño remains very strong and could continue through January 2027. This means communities should prepare for water shortages, crop losses, health risks, and pressure on children. The scale is regional, but the consequences will differ locally, depending on rainfall, water supplies, and preparedness.

05

Why can El Niño bring unusually warm weather, less rain, and fewer storms to parts of Vietnam while causing different weather elsewhere?

El Niño is a natural warming of tropical Pacific waters. That warming shifts air movement and rain belts across the world. Therefore, one region may turn warmer and drier while another becomes wetter or cooler.

The article links very strong El Niño conditions with Vietnam’s unusually warm winter and fewer storms. Central Vietnam could receive too little rain during its rainy season, while the South faces severe drought and saltwater intrusion. Altered winds and pressure can redirect moisture and storm-forming energy away from some areas.

Reports say El Niño may remain very strong through January 2027. That raises risks for water supplies, farming, ecosystems, and more than 347 million children worldwide, according to VTV.vn. Elsewhere, the same ocean warming can shift rain toward other regions, so El Niño never produces identical weather everywhere.

06

Are drought and saltwater intrusion caused only by El Niño, or can tides, sea-level rise, land subsidence, and groundwater pumping make them worse?

Hạn hán và xâm nhập mặn không chỉ do El Niño. El Niño thường làm mưa giảm và nắng nóng tăng. Thủy triều, mực biển dâng, sụt lún đất và bơm nước ngầm có thể làm tình hình nặng hơn.

Khi sông ít nước đổ ra biển, nước mặn có thể theo thủy triều tiến vào cửa sông và kênh rạch. Nếu đất lún vì khai thác nước ngầm, mặt đất hạ thấp tương đối so với biển. Bơm quá mức còn làm trữ lượng nước ngọt suy giảm, khiến cùng một đợt El Niño gây thiệt hại lớn hơn.

Các bài viết cho biết El Niño đạt đỉnh và có thể duy trì cường độ rất mạnh đến tháng 1/2027. Chúng cảnh báo miền Nam đối mặt hạn mặn gay gắt, còn miền Trung có thể thiếu mưa ngay giữa mùa mưa. Vì vậy, cần theo dõi đồng thời mưa, dòng chảy, triều và độ mặn, đồng thời giảm bơm nước ngầm.

07

How do Pacific Ocean temperatures, trade winds, and atmospheric circulation work together to create an El Niño event?

El Niño starts when unusual warming spreads across the central and eastern tropical Pacific. That warming weakens the usual east-to-west trade winds, allowing more warm water to move eastward. The heated ocean then changes rising air and rainfall, shifting weather patterns far beyond the Pacific.

In the event described by the source, El Niño became very strong and reached its peak. As trade winds weakened, warm surface water gathered nearer South America, while normal cool-water upwelling weakened. Air rose over the warmer ocean, then moved and sank elsewhere, disrupting rainfall and storm patterns.

VietNamNet reports an unusually warm winter and severe drought and saltwater intrusion in southern Vietnam. Other reports warn of fewer storms and possible mid-rainy-season rainfall shortages in central Vietnam. El Niño is expected to remain very strong through January 2027, so water planning and crop protection matter.

This brief was written by AI from the original reporting and checked by other models. Names, figures and quotes come from the source; read it for full context.

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