中国今年首个暴雨红色预警背后的气象成因
As torrential downpours triggered flooding and landslides across vast swathes of China, the national meteorological authority raised its alarm to the highest level—the red alert—for the first time this year. Since May, five successive waves of rainfall have pummeled the country, prompting emergency responses and mass evacuations. Behind this relentless deluge lies a confluence of atmospheric dynamics that turned what would normally be a seasonal nuisance into a prolonged crisis.
At the heart of China's summer rainfall is the East Asian monsoon, a vast weather system that channels moisture from the South China Sea and the Bay of Bengal onto the mainland. Typically, the monsoon's rain belt advances northward in stages, bringing the plum rain season to central and eastern China by mid-June. This year, however, the monsoon surged earlier and with greater intensity, locking a semi-stationary front across the south for weeks on end. Meteorologists note that the Western Pacific Subtropical High—a key driver of the monsoon—was both stronger and positioned further west than usual, steering successive waves of moisture-laden air into the same vulnerable regions.
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