Human-Driven Warming Amplified Extreme Flooding in Southern Africa

NASA Earth Observatory images by Michala Garrison, using MODIS data from NASA EOSDIS LANCE and GIBS/Worldview

Between late December 2025 and mid-January 2026, sustained heavy rainfall led to widespread flooding across parts of Mozambique, South Africa, and Zimbabwe, resulting in significant loss of life, population displacement, and infrastructure damage. A rapid attribution study released on 29 January 2026 by the World Weather Attribution (WWA) group concludes that anthropogenic climate change substantially intensified the rainfall associated with this event, increasing its severity beyond what would be expected under natural climate variability alone. 

Key Developments 

• Between late December 2025 and mid-January 2026, some regions experienced more than a year’s average rainfall in just 10 days. 

• Floodwaters destroyed homes, roads, schools, and health facilities, forcing mass evacuations. 

• The WWA study found that climate change increased rainfall intensity by approximately 40%. 

• La Niña conditions contributed to heavy rains, but global warming made the event far more intense. 

• Informal settlements, weak drainage systems, and limited early-warning infrastructure increased exposure and damage. 

Polar Change link 

Warming in the polar regions is influencing climate patterns far beyond the Arctic and Antarctic. Recent research shows that warming of the Southern Ocean, driven by Antarctic sea-ice loss and rising greenhouse gas emissions, can shift large-scale atmospheric circulation and alter tropical rainfall patterns. These changes affect how heat and moisture move across the globe, influencing the position and intensity of rain belts that shape precipitation in regions such as Southern Africa. This growing evidence highlights how polar change contributes to more intense and uneven rainfall, increasing climate risks in regions already facing high exposure and limited capacity to adapt. 

Health Implications 

• Higher risk of waterborne diseases such as cholera due to contaminated drinking water. 

• Damage to health facilities and disrupted access to medical care. 

• Increased mental health impacts, including stress and trauma linked to displacement and loss. 

• Disproportionate effects on women, children, older adults, and people with chronic illnesses. 

Urgent Response Needed 

• Strengthen early-warning systems and climate-informed disaster preparedness. 

• Invest in flood-resilient housing and infrastructure, especially in high-risk communities. 

• Integrate climate and health planning into national adaptation strategies. 

• Accelerate global action to reduce greenhouse gas emissions and future extreme weather risks. 

Read more about extreme weather here. 

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