Explainer: What last week’s storm says about climate change

A storm hitting South Africa’s Western Cape on May 10-11, 2026, brought record rainfall—200 to 300 millimeters in 48 hours—hurricane-force winds up to 117 km/hr, and widespread destruction. The storm flooded over 21,000 homes, killed at least ten people, and forced road closures, including parts of the N1 highway, earning comparisons to the worst Cape storm since September 2023. The event combined multiple extreme factors: a slow-moving cut-off low, consecutive cold fronts, and saturated catchments from prior rain. While cut-off lows are common in the region, their intensity and compound effects—wind, flooding, and storm surge—made this storm unusually destructive from the Garden Route to Cape Town. Researchers note climate change likely intensified the storm by increasing atmospheric moisture, a trend observed globally. Warmer air holds more water, leading to heavier rainfall during extreme events, though models predict fewer but potentially more severe storms in the region. Southern Africa has recently seen multiple devastating floods linked to climate variability and warming oceans. The storm’s severity aligns with broader shifts toward more damaging extreme weather, though its direct attribution to climate change remains under study. Current projections suggest fewer cold fronts overall but stronger rainfall during the strongest systems, with compound events becoming more common. The Western Cape has historically faced severe winter storms, but this event’s scale underscores growing risks. Authorities continue assessing long-term infrastructure and emergency response needs as climate patterns evolve.