暴雨红色预警如何发出？中国气象警报系统解读
In early summer 2023, China issued its first red alert of the year for torrential rain. Heavy downpours caused flooding and landslides across many areas. This top-level warning is rare and signals extreme danger. But what exactly triggers a red alert? And how does the warning system help protect people?
China's weather warnings use four colors: blue, yellow, orange, and red. Red is the highest level. This color-coded system was introduced nationwide in 2004 to make warnings easy to understand. A rainstorm red alert is issued when forecasters expect more than 100 millimeters of rain within three hours. Another trigger is when 250 millimeters of rain is likely within 24 hours. Such intense rain can quickly cause dangerous flooding.
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