What has this round of extreme rainfall in North China given us?

About "What did this round of extreme rainfall in North China give us?" As follows:

Many experts pointed out that coping with extreme weather, identifying risks, emergency rescue and emergency response capability are the key. In this round of rainstorm and flood in North China, the local emergency management system has caused discussion. The accuracy of weather forecast has been significantly improved, but many people are lucky that there is much room for improvement in evacuation, relocation and rescue work without moving ahead of schedule.

I. Introduction to the rainy season in North China

The rainy season in North China refers to the rainy season in northern China (North China and Northeast China) from late July to early August of the Gregorian calendar every year, which is also called "seven drops and eight highs". During this period, the subtropical high in the western Pacific reached the northernmost position in the whole year. As a result, the north entered the rainy season with the most concentrated precipitation.

During the "Seven Downs and Eight Ups" period, the northern region reached the maximum peak of rainfall. In just one month or so, the rainfall in the northern region will account for about one-third of the annual rainfall. This period has also become the most concentrated period of flood disasters in northern China.

Second, the causes of heavy rain

The causes of the rainstorm are very complicated, but there are two main conditions that contribute to the rainstorm. One is the continuous supply of water vapor due to continuous precipitation; The other is that the atmosphere is forced to rise when it meets the terrain such as hillsides, which makes the water vapor temperature lower and easier to condense. The clouds couldn't bear the weight, so it rained.

Third, the coping methods of extreme rainfall

1. Clean the drainage system and prepare emergency supplies.

First check whether the bathroom, drainage ditch and sewer pipe at home are blocked, and ask a professional company to help clean it up if necessary. Preventing water blockage can slow down the formation of floods. Storing all kinds of emergency supplies can help you deal with emergencies quickly. For example, collect enough dry food, dry towels, water storage bottles, batteries, generators, emergency lighting and so on.

2. Pay attention to rainfall warning and road conditions, and formulate risk-avoidance measures.

The rainfall exceeds half of the normal rainfall and has entered the early warning range, so we should pay close attention to the government and weather warning. Avoid going out when the road is flooded. Cover the bedding, raise the furniture to prevent flooding, and put explosives on high places. For houses with low-lying areas, automatic valves should be installed in the basement to prevent waterlogging.

3. Turn off unnecessary appliances and stay indoors in a safe place.

In order to reduce the risk of accidental short circuit, it is best not to use too many electrical appliances when it rains, especially in basements or rooms prone to water accumulation. If there is already a flooded road, don't venture out and stay in a safe place to rest. You can chat with your family or do simple adaptive physical exercise.