Traditional Culture Encyclopedia - Weather forecast - Heavy rain is divided into several grades, from big to small.
Heavy rain is divided into several grades, from big to small.
Heavy rain is divided into several grades, from big to small. People are in a bad mood when it rains. A rainstorm, literally, refers to rain with rainfall intensity equal to that of rainfall. Summer is a season of frequent rainstorms. Let's look at several levels of heavy rain, from big to small.
Heavy rain is divided into several grades, from big to small. 1 rainstorm is the rain with great precipitation intensity. According to China's meteorological regulations, rain with a precipitation of more than 50 mm in 24 hours is called "rainstorm". According to its precipitation intensity, it is divided into three grades, that is, the 24-hour precipitation is 50 ~ 99.9 mm, which is called "rainstorm"; /kloc-rainstorm below 0/00 ~ 250 mm; More than 250 mm is called "rainstorm".
How to classify rainstorm warning signal 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, which may or has affected and the rainfall may continue.
Yellow rainstorm warning signal: Within 6 hours, the rainfall will reach more than 50 mm, which will have some adverse effects or problems, and the rainfall will last for a long time.
Rainstorm orange warning signal: within 3 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm, which may or has already caused a great impact, and the rainfall may continue.
Rainstorm in red warning signal: within 3 hours, the rainfall will reach 100 mm or more, which will have a serious impact on life and may cause fire and other problems.
Heavy rain is divided into several grades from big to small. 2. The rainstorm is blue, and the rainfall will reach more than 50 mm within 12 hours, or it has reached more than 50 mm and the rainfall may continue. At this time, the government and relevant departments should prepare for the rainstorm according to their duties. Schools and kindergartens should take corresponding measures to ensure the safety of students and children. Check the urban and rural drainage system in time and prepare for drainage.
Two, the rainstorm is yellow, and the rainfall will reach more than 50 mm within 6 hours, or it has reached more than 50 mm and the rainfall may continue. At this time, the traffic management department should do a good job in traffic control or diversion of heavy rainfall sections, cut off dangerous outdoor power supply in low-lying areas, suspend open-air operations, transfer people in dangerous areas and residents of dangerous houses to safe places to avoid rain, and do a good job in drainage.
Third, the rainstorm is orange, and the rainfall will reach more than 50 mm within 3 hours, or it has reached more than 50 mm and the rainfall may continue. At this time, it is necessary to cut off the dangerous outdoor power supply and suspend outdoor work. Units in dangerous areas should suspend classes and business to prevent possible disasters such as flash floods, landslides and mudslides.
4. The rainstorm is red, and the rainfall will reach 100 mm or above within 3 hours, or it has reached 100 mm and the rainfall may continue. At this time, the government and relevant departments should do a good job in emergency rescue against rainstorm according to their duties, stop assembly, suspend classes and business, and do a good job in comprehensive prevention of all kinds of sudden disasters and evacuation of people in dangerous areas.
Heavy rain is divided into several grades, from big to small. 3. The rainstorm is divided into four levels. According to the degree of emergency, development trend and possible harm, the rainstorm grades are divided into: level 1 (red warning), level 2 (orange warning), level 3 (yellow warning) and level 4 (blue warning).
The standard of rainstorm red warning signal is that the rainfall will reach 100 mm or above within 3 hours, or it has already reached 100 mm and the rainfall may continue. The standard of rainstorm orange warning signal is that the rainfall will reach more than 50 mm within 3 hours, or it has reached more than 50 mm and the rainfall may continue.
The standard in yellow rainstorm warning signal is that the rainfall will reach more than 50 mm within 6 hours, or it has reached more than 50 mm and the rainfall may continue. The standard of blue rainstorm warning signal is 12 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.
How to deal with heavy rain
1, always pay attention to the weather forecast. With the development of science and technology, the accuracy of current weather forecast is relatively high. We should form the habit of watching the weather forecast at ordinary times. If there is a thunderstorm, we can also predict it in advance and take countermeasures as soon as possible.
2. Try not to go out. It's best to stay at home or work when it rains heavily, and then make plans when the rain subsides. If you really want to go out, you should pay special attention to the water on the road, walk carefully to prevent slipping, and be sure to avoid sewer covers and pits. At the same time, pay attention to whether there is broken wire on the ground nearby.
3, pay attention to cut off the power switch. If the rainstorm is too violent, resulting in water in the house, pay attention to cut off the power switch to avoid current conduction into the water, causing harm to the human body. Wait until the accumulated water is drained before turning on the power switch.
4. Pay attention to escape from dangerous houses. Life is the most precious thing. If the place where you live is low-lying and the house has been built for a long time, you should consider moving it to the safe residence of relatives and friends in time and go back after the rainstorm.
Heavy rain is divided into several grades, from big to small. 4 Heavy rain is divided into three grades: heavy rain, heavy rain and heavy rain. According to China's meteorological regulations, rain with a precipitation of more than 50 mm in 24 hours is called "rainstorm". According to its precipitation intensity, it is divided into three grades, that is, the 24-hour precipitation is 50 ~ 99.9 mm, which is called "rainstorm"; /kloc-rainstorm below 0/00 ~ 250 mm; More than 250 mm is called "rainstorm".
Cause of rainstorm:
The formation process of rainstorm is quite complicated. Generally speaking, sufficient and continuous water vapor, strong and lasting upward movement of airflow and instability of atmospheric structure are the main physical conditions for heavy rain. The favorable combination of various scales of weather system and underlying surface, especially topography, can produce heavy rain.
Rainstorms often fall from cumulonimbus clouds. The conditions for the formation of cumulonimbus clouds are that the atmosphere contains enough water vapor and there is a strong upward movement to transport the water vapor quickly. The water droplets in the cloud are constantly affected by the upward movement, and they suddenly fall to the ground until the updraft can't support them.
The rainstorm is divided into several grades, from big to small, and the blue warning is 5.
Standard:/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.
Guide to defense: 1. The government and relevant departments should prepare for rainstorm prevention according to their duties;
2. Schools and kindergartens should take corresponding measures to ensure the safety of students and children;
3. Drivers should pay attention to road water and traffic jams to ensure safety;
4, check the city, farmland, fish pond drainage system, drainage preparation.
Yellow warning
Standard: The rainfall will reach more than 50 mm within 6 hours, or it has reached more than 50 mm and the rainfall may continue.
Guide to defense: 1. The government and relevant departments should do a good job in rainstorm prevention according to their duties;
2. The traffic management department takes traffic control measures in heavy rainfall sections according to the road conditions, and implements traffic guidance in waterlogged sections;
3. Cut off the dangerous outdoor power supply in low-lying areas, suspend outdoor work in open-air places, and transfer people in dangerous areas and residents of dangerous houses to safe places for shelter from the rain;
4, check the city, farmland, fish pond drainage system, take the necessary drainage measures.
Rainstorm warning
Orange alert
Standard: within 3 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.
Guide to defense: 1. The government and relevant departments shall, in accordance with their duties, do a good job in emergency preparedness for heavy rain;
2. Cut off dangerous outdoor power supply and suspend outdoor work;
3. Units in dangerous areas should suspend classes or business, and take special measures to protect the safety of students, children and other staff who have arrived at school;
4, do a good job in urban and farmland drainage, pay attention to prevent possible disasters such as flash floods, landslides and mudslides.
red alert
Standard: within 3 hours, the rainfall will reach 100 mm or above, or it has reached 100 mm and the rainfall may continue.
Guide to defense: 1. The government and relevant departments should do a good job in rainstorm emergency rescue according to their duties;
2. Stop assembly, suspend classes and suspend business (except for special industries);
3, do a good job in mountain torrents, landslides, mudslides and other disasters prevention and rescue work.
Distribution of rainstorm in China:
Winter rainstorm is limited to the coastal areas of South China, with frequent rainstorm in South China from April to June. From June to July, persistent rainstorms often occur in the middle and lower reaches of the Yangtze River, with long duration, wide range and large amount of rainstorms. July-August is the main rainstorm season in northern provinces, and the rainstorm intensity is very strong. From August to 65438+ 10, the rain belt gradually withdrew southward. After summer and autumn, the typhoon rainstorm in the East China Sea and the South China Sea is very active, and the point rainfall of typhoon rainstorm is often very large.
China has a monsoon climate. From late spring to midsummer, the cold air in the north fought and retreated. Cold and warm air frequently meet, forming a series of heavy rains. The position of the main rain belt in Chinese mainland also moves from south to north with the seasons. South China (Guangdong, Guangxi, Fujian and Taiwan Province) is the region with the most rainstorm in China. April to September is the rainy season. The second half of June to the first half of July is usually the rainy season in the Yangtze River basin.
In late July, the rain belt moved to the north of the Yellow River. After September, the winter wind was established and the rain belt retreated south. Affected by the summer monsoon, the number of rainstorm days and rainfall distribution in China decrease from southeast to northwest inland, with mountains more than plains. Moreover, the southeast coastal islands and coastal areas have the largest number of rainstorm days, and the farther northwest, the less. In the northwest plateau, there is less than one day of heavy rain on average every year. Mountain slopes in the southeast or east, such as Taihang Mountain, Dabie Mountain, Nanling Mountain and Wuyishan Mountain, are the centers of rainstorm days in these areas.
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