At 19:20 on March 20, the meteorological observatory of Saga County, Xizang, issued a yellow warning signal of road icing: affected by the snow weather, it is expected that from 04:00 on March 21 to 04:00 on March 22, the G219 Saga section is prone to snow and ice, which will have a negative impact on road traffic. Defense measures: 1. Traffic, public security and other departments should take measures to deal with road snow and ice accumulation. 2. Drivers should take anti-skid measures to ensure safe driving.

The meteorological station of Shigatse City, Xizang, issued a yellow snow warning signal at 11:30 on March 20: It is expected that from 02:00 on March 21 to 02:00 on March 22, there will be moderate snow or sleet on the line from the south of Zhongba to Yadong, and heavy snow on the local area. There will be heavy snow on the southern part of Jilong, the central south of Nyalam, the southern part of Dingri, the southern part of Dingjie, and the high altitude part of the central south of Yadong (10.0~20.0 mm, local area more than 25.0 mm). After the snow, there will be a temperature drop of 4~7 ℃ from west to east. Defense measures: 1. The government and relevant departments shall prepare for snow and ice disasters in accordance with their responsibilities. 2. Carry out inspections and maintenance of roads, railways, electricity, communication and other facilities, and do a good job in road cleaning and snow melting. 3. Drivers should drive carefully and take anti-skid measures for the vehicle. 4. Reserve emergency food and forage in agricultural and pastoral areas. 5. Reinforce temporary structures such as sheds that are prone to snow pressure.