At 15:25 on April 28, the Changdu Meteorological Observatory of Xizang issued a blue warning signal for heavy rainfall: affected by the plateau vortex, it is expected that there will be light to moderate rain in our city from 17:00 on April 28 to 17:00 on April 29, and moderate to heavy rain in some towns in Karuo, Dingqing, Bianba, Leiwuqi, Luolong, Jiangda, Basu, Chaya, Gongjue, etc., and heavy snow in high-altitude towns in the above areas. (Note: Heavy rain of 17-38 millimeters; heavy snow of 5.0-10 millimeters) Defense measures: 1. High altitude mountainous roads are prone to snow accumulation, slippery roads, and low visibility. Attention should be paid to road traffic safety, and measures should be taken to prevent secondary disasters such as landslides, mudslides, and snow accumulation that may cause avalanches. 2. The roads of national highways 317, 318, 214, 349, 557, 558 and other sections in our city are slippery, and high-altitude sections are prone to snow and ice accumulation, resulting in a high level of traffic and meteorological risk. Relevant departments are requested to take preventive measures. 3. Accompanied by strong convective weather such as lightning, hail, and strong winds, outdoor workers engaged in cordyceps harvesting and engineering construction have a higher risk level of lightning disasters. Please take preventive measures.