暴雨红色预警首现，南部多省洪灾地图
When China's National Meteorological Center issued its first red alert for rainstorms this year, it marked the culmination of a soggy and dangerous few weeks. Since May, five successive bands of heavy rainfall have swept across the country's southern and central provinces, triggering flash floods and landslides that have upended daily life. The alert, the highest in a four-tier warning system, signaled that rainfall exceeding 100 millimeters in several hours was imminent or already underway, with some stations recording daily totals that dwarfed historical averages. For climatologists, the deluge is a stark reminder of how a warming planet intensifies the summer monsoon, turning seasonal rains into prolonged battering.
To understand the geography of this disaster, one must look at the complex terrain stretching from the Sichuan Basin to the coastal plains of Guangdong. Chongqing, a megacity of over 30 million perched on steep hillsides at the confluence of the Yangtze and Jialing rivers, has been particularly hammered. The local government activated a Level IV emergency response—the lowest national level but a crucial bureaucratic trigger that frees up disaster relief funds and personnel—after continuous downpours triggered dozens of mudslides that severed roads and forced the evacuation of thousands from riverside communities. Further east, in Hunan and Jiangxi, the rain-fed lakes and tributaries of the Yangtze swelled dangerously, threatening to breach dykes that last underwent major reinforcement after the catastrophic floods of 1998.
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