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Drought is a climatic phenomenon in which long-term no precipitation or precipitation is significantly less, resulting in dry air and soil water shortage, which causes water deficit in crops, inhibits normal growth and development, and ultimately leads to a decline in yield. The drought warning signal is divided into two levels, which are indicated by orange and red respectively. The classification of drought indicators is based on the comprehensive meteorological drought index in the national standard Meteorological Drought Grade (GB/T20481-2006).

Orange warning

Standard: It is expected that the comprehensive meteorological drought index will reach heavy drought in the next week (the meteorological drought will be once in 25-50 years), or more than 40% of the crops in a certain county (region) will suffer from drought.

Defense Guide:

1. The relevant departments shall, in accordance with their duties, do an emergency work to prevent drought;

2. Relevant departments shall activate emergency standby water sources, dispatch all available water sources within the jurisdiction, and give priority to ensuring domestic and urban residents' domestic water and livestock drinking water;

3. Reduce urban water supply indicators, prioritize economic crop irrigation water, and limit large amounts of agricultural irrigation water;

4. Restrict non-productive high water consumption and service industry water use, and limit the discharge of industrial sewage;

5. The meteorological department conducts artificial precipitation enhancement in due course.

Red warning

Standard: It is expected that the comprehensive meteorological drought index will reach an extreme drought in the next week (the meteorological drought is more than 50 years), or more than 60% of the crops in a certain county (district) will suffer from drought.

Defense Guide:

1. The relevant departments shall, in accordance with their duties, do a good job in preventing and responding to droughts;

2. Governments at all levels and relevant departments initiate emergency water supply schemes such as remote water transfer, and adopt various means such as raising external water, deep wells, and delivering water by vehicles to ensure the living of urban and rural residents and drinking water for livestock;

3. Limited or limited supply of domestic water for urban residents, narrowing or phased agricultural irrigation and water supply;

4. It is strictly forbidden to use non-productive high-water consumption and service industry water, and suspend the discharge of industrial sewage;

5. The meteorological department will increase the intensity of artificial precipitation enhancement work in a timely manner.

The rainstorm warning signal is divided into four levels, which are represented by blue, yellow, orange and red.

(1) Rainstorm blue warning signal standard: The rainfall will reach 50 mm or more within 12 hours, or it may have reached 50 mm or more and the rainfall may continue.

Defense Guide:

1. The government and relevant departments shall prepare for the riot prevention in accordance with their duties;

2. Schools and kindergartens take appropriate measures to ensure the safety of students and young children;

3. Drivers should pay attention to road water and traffic congestion to ensure safety;

4. Check the drainage system of cities, farmland and fish ponds, and prepare for drainage.

(2) Rainstorm yellow warning signal standard: The rainfall will reach 50 mm or more within 6 hours, or it may have reached 50 mm or more and the rainfall may continue.

Defense Guide:

1. The government and relevant departments shall do a good job in preventing rainstorms in accordance with their duties;

2. The traffic management department shall adopt traffic control measures in the heavy rainfall section according to the road conditions, and implement traffic guidance on the accumulated water section;

3. Cut off the dangerous outdoor power supply in low-lying areas, suspend outdoor operations in open areas, and transfer people in dangerous areas and inhabitants of dangerous houses to safe places to avoid rain;

4. Check the drainage system of cities, farmland and fish ponds, and take necessary drainage measures.

(3) Orange rain warning signal standard: The rainfall will reach 50 mm or more within 3 hours, or it may have reached 50 mm or more and the rainfall may continue.

Defense Guide:

1. The government and relevant departments shall carry out anti-storm emergency and rescue work in accordance with their duties;

2. Stop assembly, suspension of classes, and suspension of business (except for special industries);

3. Do a good job in defense and rescue work for disasters such as mountain torrents, landslides and mudslides.

(4) Rainstorm red warning signal standard: The rainfall will reach 100 mm or more within 3 hours, or it may have reached more than 100 mm and the rainfall may continue.

Defense Guide:

1. The government and relevant departments shall, in accordance with their duties, do a good job in preventing typhoon emergency and rescue work;

2. Stop assembly, suspension of classes, and suspension of business (except for special industries);

3. Ships returning to the harbor to avoid the wind should take active measures according to the situation and properly arrange the personnel to stay or transfer to a safe place;

4. Reinforce or dismantle the structures that are easily blown by the wind. The personnel should stay in a place where the wind is safe. When the typhoon center passes, the wind will decrease or stay for a while. Remember that the strong wind will suddenly hit and should remain in safety. Avoid shelter from the wind and transfer personnel in danger in time;

5. Relevant areas should pay attention to prevent mountain floods and geological disasters caused by heavy precipitation.

Typhoon warning signal

Typhoon blue warning signal

Meaning: It may or may have been affected by tropical cyclones within 24 hours. The average wind force on the coast or land is above 6 or above 8 or above gusts and may continue.

Defense Guide:

1. The government and relevant departments shall prepare for the prevention of typhoon in accordance with their duties;

2. Stop open-air collective activities and outdoor dangerous work such as high altitude;

3. Take active measures in the waters of the relevant waters and the passing ships, such as returning to Hong Kong to avoid the wind or bypassing the road;

4. Reinforce doors and windows, coamings, scaffolding, billboards and other structures that are easily blown by the wind, cutting off dangerous outdoor power.

Typhoon yellow warning signal

meaning:

Within 24 hours, it may or may have been affected by tropical cyclones. The average wind force on the coast or land is above 8 or above gusts and may continue.

Defense Guide:

1. The government and relevant departments shall prepare for the prevention of typhoon in accordance with their duties;

2. Stop indoor and outdoor large gatherings and outdoor dangerous work such as high altitude;

3. Take active measures in the waters of the relevant waters and the passing ships to strengthen the port facilities and prevent the ships from anchoring, stranding and colliding;

4. Reinforce or dismantle the structures that are easily blown by the wind. Personnel should not go out at will, ensuring that the elderly and children stay in the safest place at home, and the dilapidated personnel are transferred in time.

Typhoon orange warning signal

meaning:

Within 12 hours, it may or may have been affected by tropical cyclones. The average wind force on the coast or land is above 10, or the gust is above 12 and may continue.

Defense Guide:

1. The government and relevant departments shall, in accordance with their duties, do a good job in preventing typhoon emergency response;

2. Stop large-scale indoor and outdoor gatherings, suspensions, and closures (except for special industries);

3. Water operations in the relevant waters and passing ships should return to Hong Kong to avoid wind, strengthen port facilities, and prevent ships from anchoring, stranding and collision;

4. Reinforce or dismantle the structures that are easily blown by the wind. Personnel should stay in the place where the wind is safe. When the typhoon center passes, the wind will decrease or stay for a while. Remember that the strong wind will suddenly hit and should continue to stay. Avoid shelter from the wind in safe places, and transfer personnel in danger in time;

5. Relevant areas should pay attention to prevent mountain floods and geological disasters caused by heavy precipitation.

Typhoon red warning signal

meaning:

Within 6 hours, it may or may have been affected by tropical cyclones. The average wind force on the coast or land is above 12, or the gust is above 14 and may continue.

Defense Guide:

1. The government and relevant departments shall, in accordance with their duties, do a good job in preventing typhoon emergency and rescue work;

2. Stop assembly, suspension of classes, and suspension of business (except for special industries);

3. Ships returning to the harbor to avoid the wind should take active measures according to the situation and properly arrange the personnel to stay or transfer to a safe place;

4. Reinforce or remove structures that are easily blown by the wind. Personnel should stay in a place where wind protection is safe. When the typhoon center passes, the wind will decrease or stay for a while. Remember that strong winds will suddenly hit and should remain in safety. Avoid shelter from the wind and transfer personnel in danger in time;

5. Relevant areas should pay attention to prevent mountain floods and geological disasters caused by heavy precipitation.

What is the warning signal for “dry”, “澇” and “wind”?