Record El Nino Threatens China's Summer Climate

A potent El Nino event is rapidly intensifying in the tropical Pacific, with forecasts suggesting it could become the strongest on record by year's end. This phenomenon is already shaping China's summer weather, characterized by unusually complex patterns.

Sea surface temperatures in the central and eastern equatorial Pacific have seen a significant rise, with the monitored index reaching 2.64 C above normal in early August. This rapid warming trend suggests the event will likely exceed the threshold for a super El Nino. Such an occurrence could surpass the intensity of previous record-holding El Ninos from 1982-83, 1997-98, and 2015-16.

China is currently experiencing weather typical of an El Nino's developing phase. Rainfall has concentrated in northern and southern belts, influenced by a northward shift and strengthening of the western Pacific subtropical high and monsoon trough. This, combined with upper-level cold vortices, has led to widespread and intense precipitation.

Furthermore, a stronger summer monsoon has fueled increased typhoon activity and storm intensity in the western North Pacific and South China Sea, contributing to more rainfall in southern China. Northern China has also faced persistent heavy rain and strong winds due to the interaction of the subtropical high with cold vortices, and northward moisture transport from typhoons.

The National Climate Center warns of overlapping rain-producing systems, extensive heavy precipitation, and an elevated risk of compound disasters. These effects are anticipated to persist into the autumn due to the climate system's time lag response. Eastern, southern, and southwestern China are expected to receive more rainfall, while central and northwestern areas may experience drier conditions.

Above-average temperatures are also predicted across most of China, with particularly noticeable warming in eastern, central, southwestern regions, and the Xinjiang Uygur autonomous region. The National Climate Center will intensify its monitoring and forecasting efforts to track El Nino's development and its ongoing impact on China's climate.