Is it true that the Beijing Meteorological Observatory issued a blue warning signal for strong winds?

China Weather Network News The Beijing Meteorological Observatory issued a blue gale warning signal on February 23rd 17+07:

Affected by cold air, it is estimated that there will be northerly winds of Grade 4 and 5 in Beijing from midnight on the 23rd to daytime on the 24th, and the gust can reach about Grade 7. Please take preventive measures.

Defense guide:

1. The government, relevant departments and units shall, in accordance with their duties, make good preparations for gale prevention, pay close attention to fire prevention in forests, grasslands and cities, and the airport, railway and traffic management departments shall take measures to ensure traffic safety;

2. Stop outdoor work and entertainment activities at high altitude and on water;

3. Strengthen structures such as hoardings, scaffolding and billboards that are easily blown by strong winds, and properly arrange outdoor items that are easily damaged by strong winds; Check the film in the greenhouse, paste loopholes and suspend farmland irrigation;

4. Pedestrians should ride bicycles as little as possible. When walking near the construction site, try to stay away from the construction site and pass quickly. Pedestrians and vehicles are not allowed to stay under tall buildings, billboards, temporary structures or trees;

5. Streets, communities, villages and families should strengthen their awareness of fire prevention and take effective measures in time to eliminate fire hazards.