How is the early warning level of natural disasters in China divided?

Rainstorm warning: Rainstorm warning signal is divided into four levels. Blue rainstorm warning signal:/kloc-within 0/2 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm, and the rainfall may continue; Yellow rainstorm warning signal: The rainfall will reach more than 50 mm within 6 hours, or it has reached more than 50 mm, and the rainfall may continue; Rainstorm orange warning signal: within 3 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm, and the rainfall may continue; Rainstorm in red warning signal: The rainfall will reach 100mm or above within 3 hours, and it may continue. ?

Typhoon warning: Typhoon warning signals are divided into four levels. Typhoon blue warning signal: it may or may have been affected by tropical cyclones within 24 hours, and the average wind force along the coast or land is above 6, or the gust is above 8, and it may continue; Typhoon yellow warning signal: it may be or has been affected by tropical cyclones within 24 hours, and the average wind force along the coast or land is above 8, or the gust is above 10, and it may continue; Typhoon orange warning signal: it may be or has been affected by tropical cyclones within 12 hours, and the average coastal or land wind force is above 10, or the gust is above 12, and it may continue; Typhoon red warning signal: It may be or has been affected by tropical cyclones within 6 hours, with the average coastal or land wind force 12 or gust 14 or above, and may continue.

Frost warning: Frost warning signals are divided into three levels. Frost blue warning signal: within 48 hours, the minimum ground temperature will drop below 0℃, which will have an impact on agriculture, or it has already dropped below 0℃, which has already had an impact on agriculture and may continue; Yellow warning signal of frost: within 24 hours, the ground minimum temperature will drop below minus 3℃, which has a serious impact on agriculture, or it has dropped below minus 3℃, which has a serious impact on agriculture and may continue. Frost orange warning signal: within 24 hours, the ground minimum temperature will drop below minus 5℃, which has a serious impact on agriculture, or it has dropped below minus 5℃, which has a serious impact on agriculture and will continue;

Cold wave warning: the cold wave warning signal is divided into four levels. Cold wave blue warning signal: within 48 hours, the minimum temperature drops by more than 8℃, the minimum temperature is less than or equal to 4℃, and the average wind power on land reaches above 5; Or it has dropped by more than 8℃, the lowest temperature is less than or equal to 4℃, and the average wind power reaches more than 5, which may continue; Yellow warning signal of cold wave: within 24 hours, the minimum temperature will drop by more than 10℃, the minimum temperature is less than or equal to 4℃, and the average wind power on land can reach above 6. Or it has dropped above 10℃, the lowest temperature is less than or equal to 4℃, and the average wind force is above 6, and it may continue; Cold wave orange warning signal: within 24 hours, the minimum temperature will drop by more than 12℃, the minimum temperature is less than or equal to 0℃, and the average wind power on land can reach above 6. Or it has dropped above 12℃, the lowest temperature is less than or equal to 0℃, and the average wind force is above 6, and it may continue.

Cold wave red warning signal: within 24 hours, the minimum temperature will drop by more than 16℃, the minimum temperature is less than or equal to 0℃, and the average wind power on land can reach above 6; Or it has dropped above 16℃, the lowest temperature is less than or equal to 0℃, and the average wind force is above 6, and it may continue.

Blizzard warning: Blizzard warning signal is divided into four levels. Blue warning signal of blizzard: 12 hours, the snowfall will reach more than 4 mm, or it has reached more than 4 mm, and the snowfall continues, which may have an impact on traffic or agriculture and animal husbandry.

Yellow warning signal of blizzard: 12 hours, the snowfall will be more than 6mm, or it has reached more than 6mm, and the snowfall continues, which may have an impact on traffic or agriculture and animal husbandry.

Snowstorm orange warning signal: The snowfall has reached more than 10mm within 6 hours, or has reached more than 10mm, and the snowfall continues, which may or may have had a great impact on traffic or agriculture and animal husbandry.

Blizzard red warning signal: The snowfall will reach 15mm within 6 hours, or it has already reached 15mm, and the snowfall will continue, which may or has already had a great impact on traffic or agriculture and animal husbandry.

Disaster early warning: refers to the establishment of an emergency network and the release of disaster information before disasters occur. In order to cope with the occurrence of catastrophic natural disasters, the central and local governments (above the county level) should gradually establish and improve the early warning mechanism of natural disasters, and the responsibility should be implemented on specific people to reduce all kinds of losses caused by disasters.

The "July 21"catastrophic natural disaster in Beijing is the hardest hit area, with three kinds of disasters: stagnant water, mountain torrents and mudslides, and the affected area is large. The direct economic loss exceeded 10 billion, and the casualties were huge. It will take at least three months to rebuild the disaster area. After the disaster, the government is thinking about why our urban system is so fragile. Can our various units, departments, public places and tourist attractions establish more effective disaster early warning systems, inform people of disaster prevention in time when disasters come, and minimize disaster losses? The answer is yes. In fact, in recent years, with the climate warming, various natural disasters are on the rise in the world. How to prevent various natural disasters is also a problem and work that government departments at all levels attach great importance to. ?

A complete disaster early warning system can timely release the early warning to the society to avoid the risk of natural disasters, publicize the common sense and skills of avoiding risks, and remind the public to prepare for self-help and mutual assistance; Open emergency shelters, evacuate and transfer people and property vulnerable to natural disasters, and carry out organized evacuation in case of emergency; Strengthen the safety of villages, communities and public places vulnerable to natural disasters; Guide civil affairs departments to prepare for basic life assistance.