What does heavy rainfall mean? What should I pay attention to in heavy rainfall?

Many of us have heard of heavy rain. Recently, many areas in China have been affected by heavy rain, but many people don't know what it means, so let's find out. What should I pay attention to in heavy rainfall?

What does heavy rainfall mean?

Heavy rainfall is generally called rainstorm in meteorology, or heavy precipitation, which refers to rain with great precipitation intensity. Precipitation refers to the depth of precipitation in a certain period of time, which is measured in millimeters internationally. /kloc-rainfall within 0/hour/kloc-rain above 0/6mm; In the meteorological department, there are special terms for precipitation intensity at all levels: 24-hour precipitation is the standard, and the rainfall less than 10 mm is light rain; Rain with a rainfall of 50 mm or more in 24 hours. Based on the utilization of rainwater and flood prevention, it is divided into general rainstorm, heavy rainstorm and extremely heavy rainstorm according to rainfall intensity. /kloc-a rainstorm with a rainfall of less than 70 mm in 0/2 hour or less than 100 mm in 24 hours is called "general rainstorm". /kloc-a rainstorm with a rainfall of more than 70 mm but less than 140 mm in 0/2 hour or a rainfall of more than 100 mm but less than 200 mm in 24 hours is called a "heavy rainstorm". A rainstorm with a rainfall of more than140mm12hr or a rainfall of 200mm over 24hr is called a "heavy rainstorm".

What should I pay attention to in heavy rainfall?

First of all, be sure to close the window and turn off the corresponding electrical appliances before going out, and it is best to cut off the power supply. And take the items or clothes left on the balcony back to your home to avoid being blown down by the wind and hitting others. When traveling in heavy rainfall, try not to rely on fences or tall buildings, because in this extreme weather, there is a danger that buildings will collapse and hit others. At the same time, we should also pay attention to observation, avoid places with eddies, try not to go to places with many puddles and stay in deep water. Secondly, if there is heavy rain, you are driving. You must slow down, because rain will reduce the friction between the ground and the tires, which will definitely affect the braking sensitivity, so you must slow down in the rain. Also, when driving in rainy days, you must increase the distance between cars, always pay attention to driving ahead and prepare for emergency measures. Also, if you pass through the deep water area and the water level has reached 2/3 of the tire, don't venture forward, try to bypass and don't force your way through. Finally, in the case of heavy rainfall, try to stay at home. Never drink raw water and some turbid water. Try to drink boiled water or bottled water. In addition, thunderstorms may also cause mudslides, floods and so on. People in the wild should stay away from dangerous areas as soon as possible.

There will be a wide range of heavy rainfall during the Mid-Autumn Festival holiday.

The Central Meteorological Observatory predicts that the rainfall in China will gradually increase from the night of September 17 to the 20th. There will be heavy rainfall from west to east in the provinces (urban areas) above 10, such as the eastern part of northwest China, the eastern part of southwest China, Jianghan, Huanghuai, North China and Northeast China. The rainfall process is dominated by stable rainfall, which has a wide range of influences, many affected areas and a long rainfall period. The specific impact time of rainfall is from the night of 17 to the day of 19, mainly affecting the eastern part of northwest China and the eastern part of southwest China. During the night of 18 to 19, the rainfall in North China, Huanghuai and Jianghan increased. On the 20th, the rainfall area will move to the southeast of Inner Mongolia and the south-central part of Northeast China. Among them, there are heavy rains in northeastern Sichuan, Chongqing, central and southern Shaanxi, central and western Hubei, central and northern Henan, northern Shandong, central and southern Shanxi, southern and eastern Hebei, Tianjin, central and southern Liaoning, and southeastern Inner Mongolia. The cumulative rainfall in these areas is 30 ~ 60mm, 80 ~120mm in some areas and 65438+ in some areas.

Measures to deal with heavy rain

Try not to go out during the rainstorm. When you have to go out, you should try to bypass the area with serious water accumulation. Pay attention to observation and walk close to buildings to prevent yourself from falling into manhole and pit. When you can't find a safe shelter from the rain in time when you are outdoors, you need to stay away from trees and masts, and don't stand on the top of the mountain, the roof or other objects with high conductivity; Do not handle flammable items in open containers; Badminton racket, fishing rod, bamboo rod, etc. You shouldn't carry it on your shoulders when lightning strikes. To prevent small-scale waterlogging of residents' houses, water retaining boards, sandbags or mounds should be placed at the door according to local conditions, and residents in dangerous buildings or low-lying areas should be moved to safety in time.