The beginning of summer has just passed, and the process of summer has been started all over the country. The meteorological department predicts that there will be more precipitation in many places in China this summer, which may lead to extreme heavy precipitation and flood disaster. Here, the Chinese Internet joint rumor dispelling platform answers questions and doubts about the related misconceptions such as "rainstorm is pouring rain?" "typhoon warning signal is lifted, it's OK?" "indoor lightning protection is not required?" and carries out science popularization around the knowledge related to rainstorm risk avoidance and self rescue. Let's get to know!
These misunderstandings should be recognized
1、 A rainstorm is a pouring rain? Not necessarily, look at the cumulative precipitation!
"The rain is too small, how can it be a rainstorm?" Every flood season, when people do not wait for the heavy rain or rainstorm mentioned in the forecast, this question will arise. In fact, ordinary people often define the size of rainfall from the sense of evaluation, such as a sudden storm, but the rain soon stopped, people will also say that "it has just been a rainstorm". But in meteorology, "rainfall" has strict magnitude regulations. Meteorologically speaking, the magnitude of "heavy rain" and "rainstorm" refers to the accumulated precipitation, that is, the precipitation of 24 hours a day. The precipitation with a 24-hour precipitation of more than 25 mm is called heavy rain; Rainstorm refers to the precipitation with a 24-hour precipitation of 50 mm or more. When a short-term heavy rainfall occurs, it may rain heavily within a few minutes, but the cumulative precipitation may not reach a large scale, or even a heavy rain scale, which is not called a rainstorm. The meteorological department will keep rolling updates and timely issue forecast and early warning according to the weather change trend.
2、 Will it be OK if the typhoon warning signal is lifted? More attention is needed!
The landing process of typhoon is accompanied by huge destructive force. As the intensity of typhoon weakens, the Central Meteorological Station will stop numbering it and the warning signal will usually be lifted. However, this does not mean that the typhoon has disappeared, and its residual forces may still have a serious impact. It is necessary to focus on preventing meteorological disasters and derivative disasters such as mountain floods, debris flows, landslides caused by heavy rainfall, urban and rural floods, waterlogging, as well as dam overflow and collapse of reservoirs and ponds in small and medium-sized rivers. At this time, it is still necessary to pay special attention to the "rainstorm warning signal" issued by the meteorological department, as well as the flash flood warning and geological disaster warning issued by the relevant departments, so as to timely transfer the people living and stranded in the trench bottom, the downstream of the reservoir pond, the edge of the dry river bed, and the urban and rural low-lying areas in the affected area.
3、 Is it safe when the rainstorm stops? Watch out for secondary disasters!
The cessation of rainstorm does not mean safety, and some secondary disasters may have just begun. First of all, after rain, there are still risks of geological disasters such as collapse and landslide. Secondly, after the water recedes, the housing quality should be checked for security to confirm whether it is firm. After entering the house, open the doors and windows, ventilate, clean the furniture, and clean the indoor articles. Try to disinfect the walls and floor of the room to eliminate indoor germs. Clothes and daily necessities should be sterilized and exposed to the sun before being worn. At the same time, attention should be paid to preventing mosquito epidemics. Especially after the flood, it is necessary to cooperate with the health and epidemic prevention department to carry out the work of killing mosquitoes, flies and mice. Try to clean the water and garbage around the residence to avoid breeding mosquitoes. When working in the field, the trouser legs and cuffs should be tightened to prevent mosquito bites.
4、 Do not need lightning protection indoors? Both indoor and outdoor!
When lightning strikes, if appropriate measures are not taken indoors, it may not only be directly attacked by spherical lightning, but also be attacked by indirect lightning. Indoor lightning protection shall be done as follows: close the doors and windows, and keep away from metal doors and windows as far as possible; Don't stand on the balcony; Do not approach or touch any metal pipeline, including water pipe, gas pipe, etc. In addition, it is better not to use solar water heaters in thunderstorm days. For the need of heat collection, some families often install solar water heaters higher than the lightning strip, and the water heaters become "lightning rods". The lightning current may enter the user's room directly through the pipes, power lines and signal lines of the water heaters, which may cause the water heaters and household appliances to burn, or even cause explosions, fires and casualties.
Keep these safety knowledge in mind
1、 In public outdoor areas
1. Look for a stable highland: a square with high terrain, a solid area above the second floor of a multi-storey high-rise public building (above the water surface). Avoid taking refuge on bridges, especially on river bridges.
2. Avoid entering dangerous areas: avoid climbing flood prevention facilities such as river levees. Avoid entering underground culverts, cross street tunnels, underground civil air defense works, underground commercial streets and other underground buildings. Avoid approaching old buildings. Keep away from the hillside, do not stand under or beside trees, and do not close to billboards. Try not to walk against walls and buildings to prevent building collapse, falling objects and other dangers.
3. Keep away from power facilities: keep away from all objects with power supply danger signs, such as high-voltage lines, high-voltage towers, transformers, etc. Keep away from wires and rope like objects. Do not touch the socket, switch and other live equipment when it is impossible to ensure that the body and hands are dry. Avoid standing high in the open air to avoid lightning strikes.
2、 When indoors
1. The personnel on the low floor should immediately prepare for the transfer, and prepare the necessary supplies for the elderly, children and the sick in advance.
2. Take back the articles placed on the balcony and the clothes dried outdoors in time to avoid being blown down by strong wind and hurting others.
3. Cut off the power supply in the home to avoid the fire caused by short circuit of equipment and wires due to water ingress in the home. Close the gas switches at all levels to avoid gas leakage.
3、 When driving
1. Timely understand the road condition information. When encountering deep water on the road surface or under the overpass, try to detour and do not force through.
2. Slow down and try to keep a certain distance from the car in front of you. Don't follow the car too closely, let alone overtaking frequently.
3. In case of stalling during wading, do not restart the engine, and do not wait on the vehicle. Get off the vehicle and wait for rescue.
The China Internet joint rumor refutation platform reminds you to pay more attention to the early warning and forecast information in case of heavy rainfall and take precautions in advance. Don't go out unless necessary. If you need to go out, please pay attention to safety.