At 15:38 on July 17, the Changdu Meteorological Observatory in Xizang issued a blue warning signal of heavy rainfall: affected by the shear line, it is expected that from 17:00 on July 17 to 17:00 on July 18, some towns in Gongjue, Chaya, Luolong, Karo, Zuogong, Mangkang, Basu, Jiangda and other places will have moderate to heavy rain (17 to 38 millimeters), of which some towns in Gongjue, Chaya, Mangkang, Zuogong and other places will have heavy rain (25 to 49.9 mm), and other places will have light to moderate rain. During the process, strong convective weather such as lightning, strong winds, hail, and short-term heavy precipitation are prone to occur. Defense measures: 1. It is necessary to strengthen the inspection and elimination of hidden geological hazards, and prevent secondary disasters such as local flash floods, geological disasters, and urban and rural waterlogging that may be caused by heavy precipitation. 2. Prevent the adverse effects of heavy rainfall on major construction projects, communication facilities, transportation, etc. 3. Pay attention to preventing the adverse effects of severe convective weather on agricultural and animal husbandry production, outdoor activities (construction sites, high-altitude operations), etc.
西藏昌都市气象台于7月17日15时38分发布强降雨蓝色预警信号：受切变线影响，预计7月17日17时至18日17时贡觉、察雅、洛隆、卡若、左贡、芒康、八宿、江达等地的部分乡镇有中到大雨（17～38毫米），其中贡觉、察雅、芒康、左贡等地的部分乡镇有大雨（25～49.9毫米），其余各地有小到中雨。过程期间易出现雷电、大风、冰雹、短时强降水等强对流天气。 防御措施：1.需加强地质灾害隐患点的巡查排险，防范强降水可能引发的局地山洪、地质灾害及城乡内涝等次生灾害。2.防范强降水对重大工程建设、通讯设施、交通运输等带来的不利影响。3.注意防范强对流天气对农牧业生产、户外活动（工地施工、高空作业）等的不利影响。
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