rainstorm warning: rainstorm warning signals are divided into four levels. Blue rainstorm warning signal: within 12 hours, the rainfall will reach more than 51mm, or it has reached more than 51mm, and the rainfall may continue; Yellow rainstorm warning signal: The rainfall will reach more than 51mm within 6 hours, or it has reached more than 51mm, and the rainfall may continue; Rainstorm orange warning signal: within 3 hours, the rainfall will reach more than 51mm, or it has reached more than 51mm, and the rainfall may continue; Rainstorm in red warning signal: within 3 hours, the rainfall will reach more than 111mm, or it has reached more than 111mm, and the rainfall may continue. ?

typhoon warning: the typhoon warning signal is divided into four levels. Typhoon blue 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 6, or the gust is above 8, and it may continue; Yellow warning signal of typhoon: 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 8, or the gust is above 11, and it may continue; Typhoon orange warning signal: within 12 hours, it may or may have been affected by tropical cyclones, and the average wind force along the coast or land is above 11, or the gust is above 12, and it may continue; Typhoon red warning signal: It may or may have been affected by tropical cyclones within 6 hours, and the average wind force along the coast or land is above 12, or the gust is above 14, and it may continue.

frost warning: the frost warning signal is divided into three levels. Frost blue warning signal: within 48 hours, the minimum ground temperature will drop below 1℃, which will have an impact on agriculture, or it has dropped below 1℃, which has already had an impact on agriculture and may continue; Yellow warning signal of frost: within 24 hours, the minimum ground temperature will drop below minus 3℃, which will have a serious impact on agriculture, or it has dropped below minus 3℃, which has had a serious impact on agriculture and may continue. Frost orange warning signal: within 24 hours, the minimum ground temperature will drop below minus 5℃, which will have a serious impact on agriculture, or it has dropped below minus 5℃, which has had 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 will drop by more than 8℃, the minimum temperature will be less than or equal to 4℃, and the average wind power on land will reach more than 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 11℃, 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 by more than 11℃, the lowest temperature is less than or equal to 4℃, and the average wind power is above 6, which may continue; Cold wave orange warning signal: within 24 hours, the minimum temperature will drop by more than 1.2℃, the minimum temperature is less than or equal to 1℃, 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 1℃, 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 1.6℃, the minimum temperature will be less than or equal to 1℃, and the average wind power on land will reach above 6. Or it has dropped above 16℃, the lowest temperature is less than or equal to 1℃, 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: The snowfall will reach more than 4mm within 12 hours, or it has reached more than 4mm, and the snowfall will continue, which may have an impact on traffic or agriculture and animal husbandry.

yellow warning signal of snowstorm: within 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.

orange warning signal of blizzard: the snowfall within 6 hours is more than 11mm, or has reached more than 11mm, and the snowfall continues, which may or has had a great impact on traffic or agriculture and animal husbandry.

Blizzard red warning signal: Within 6 hours, the snowfall will be more than 1.5 mm, or it has reached more than 1.5 mm, and the snowfall will continue, which may or has had a great impact on traffic or agriculture and animal husbandry.

disaster early warning: refers to the establishment of emergency network and the release of disaster information before a disaster occurs. In order to cope with the occurrence of catastrophic natural disasters, the central and local governments (at or 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 damage caused by disasters.

The "July 21" catastrophic natural disaster in Beijing is the hardest hit area, with three disasters, namely, accumulated water, mountain torrents and mudslides, and the affected area is large. The direct economic loss exceeds 11 billion, and the casualties are 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 a more effective disaster early warning system, inform people in time to prevent disasters when disasters come, and reduce the losses of disasters as much as possible? The answer is yes. In fact, in recent years, with the climate warming, all kinds of natural disasters are on the rise around the world. How to prevent all kinds of natural disasters is also a problem and work that government departments at all levels attach great importance to. ?

A complete set of disaster early warning system can timely issue warnings to the society to avoid the risks of natural disasters, publicize 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 that are vulnerable to natural disasters, and implement organized evacuation in case of emergency; Strengthen the security of villages, communities and public places vulnerable to natural disasters; Instruct civil affairs and other departments to make preparations for basic living assistance.