Meteorological elements of wind hazards and basic knowledge

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Gale disasters are common in all seasons, with high frequency, wide range, and heavy disasters. Winter and spring are mainly cold winds, accompanied by severe cooling. People living in cities will also have a strong understanding of strong winds. High winds will have a great impact on high-rise buildings, power facilities, transportation, and people's lives.

basic knowledge

Gale (except for typhoon) warning signals are divided into four levels, which are respectively indicated by blue, yellow, orange and red.

(I) Blue Wind Warning Signal

Standard: Within 24 hours, it may be affected by strong winds, and the average wind power can reach 6 or more, or gusts of 7 or more; or, already affected by strong winds, the average wind power is 6-7, or gusts 7-8 and may continue.

Defense Guide:

1. The government and related departments shall do a good job of preventing winds according to their duties;

2. Close the doors and windows, reinforce the structures that are easily blown by the wind, such as the cofferdams, scaffolds, and billboards, and properly place outdoor objects that are easily affected by strong winds to cover the building assets;

3. Take active measures to deal with waterborne operations in related waters and past ships, such as returning to the harbor for sheltering or bypassing the sea;

4. Pedestrians pay attention to riding as little as possible, and do not stay under billboards, temporary structures, etc. while wind blowing;

5. Relevant departments and units pay attention to fire protection such as forests and grasslands.

(II) Strong yellow warning signal

Standard: The wind may be affected within 12 hours, and the average wind power can reach 8 or above, or gusts above 9; or already affected by strong winds, the average wind power is 8-9, or gusts 9-10 and may continue.

Defense Guide:

1. The government and related departments shall do a good job of preventing winds according to their duties;

2. Stop open-air activities and outdoor dangerous operations such as high altitude. Danger zone personnel and residents of dangerous houses should try to shelter from the wind in places sheltered from the wind;

3. The relevant waters on the water operations and past ships take active measures to strengthen the port facilities and prevent ships from anchoring, stranding and collisions;

4. Cut off outdoor dangerous power supply, properly place outdoor items susceptible to strong winds, and cover the building assets;

5. Airports, highways and other units shall adopt measures to ensure traffic safety. Relevant departments and units shall pay attention to forest and grassland fire prevention.

(c) Orange Warning Signal

Standard: 6 hours may be affected by strong winds, the average wind power can reach 10 or more, or gusts above 11; or already affected by strong winds, the average wind force is 10 to 11 levels, or gusts 11 to 12 and may continue.

Defense Guide:

1. The government and relevant departments shall do a good job in preventing winds and emergency work according to their duties;

2. The small and medium-sized schools and units with weak housing resisting wind capacity should suspend classes, suspend business, and reduce the number of people going out;

3. Water operations in related waters and passing ships should return to the harbor to shelter from the wind, reinforce the port facilities and prevent ships from anchoring, stranding and colliding;

4. Cut off dangerous power sources, properly place outdoor objects that are easily affected by strong winds, and cover the building assets;

5. Airports, railways, highways, water transportation and other units shall adopt measures to ensure traffic safety. Relevant departments and units shall pay attention to forestry, grassland and other fire prevention.

(D) Red Wind Warning Signal

Standard: 6 hours may be affected by a strong wind, the average wind power can reach 12 or above, or gusts above 13; or already affected by strong winds, the average wind power is above 12 or gusts above 13 and may continue.

Defense Guide:

1. The government and related departments shall do a good job in preventing windstorms and emergency rescue work according to their duties;

2. People should stay in windproof and safe places as far as possible, and do not go out at will;

3. Vessels returning to Hong Kong to take shelter should take active measures depending on the situation and properly arrange personnel to stay or move to a safe area;

4. Cut off dangerous power sources, properly place outdoor objects that are easily affected by strong winds, and cover the capital of buildings;

5. The relevant departments and units shall pay attention to forestry, grassland and other fire prevention. Airports, railways, highways, and water transportation organizations should take measures to ensure traffic safety.

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