What are the defensive measures for the cold wave?

Now all over the country began to cool down, and the cold wave gradually invaded. What measures do we take in the face of the cold wave? What will happen when the cold wave comes?

Cold wave prevention measures

1, when the cold wave comes, be sure to keep warm and wear thick clothes to ensure that the heat in the body will not be easily lost and it is not easy to get sick from frostbite. At the same time, when you go out, you'd better put on a hat, scarf and gloves for yourself. In fact, hands, neck and head are also the main parts of the human body to dissipate heat, so when the cold wave strikes, we should pay attention to keeping these parts warm to avoid frostbite.

When the cold wave comes, people close all doors and windows in order to ensure the indoor temperature, which is actually very wrong. Air circulation is not good for people's health, but easy to get sick. Close the doors and windows to ensure smooth air circulation. At the same time, it is the best response to ensure adequate exercise and not change your good living habits because of the weather.

3. When the cold wave comes, we should pay attention to the adverse effects of wet roads, snow and ice, and low visibility weather on traffic. Vehicles should keep a safe distance, use lights reasonably, and pedestrians should pay attention to anti-skid when going out.

4, when the cold wave comes, the doors and windows, scaffolding, temporary structures and other buildings to do a good job of fixing, placing outdoor items vulnerable to the cold wave, to avoid damage to items.

What is the performance of the cold wave?

In the northwest desert and loess plateau, it is characterized by less wind and snow, which is easy to cause sandstorm weather; In Inner Mongolia grassland, it is windy, snowy and cold weather; In North China and Huanghuai areas, cold waves are often accompanied by snow. In the northeast, it is characterized by more violent winds and more snow, and the snowfall is the highest in the country; Jiangnan is often accompanied by freezing rain.

There is a strong cold front on the high pressure front of the cold wave ground, which inclines to the cold air side with the height, and there is a strong front area on the high altitude isobaric surface. The front area is wide and narrow in structure, and there are obvious cold troughs and front areas on the isobaric surface below 300hPa.

What is the official feature of this cold wave weather?

Cause of formation-Siberian cold air mass heading south

In the early days, there was a ridge of high pressure in the Ural Mountains, which extended to the polar regions. The northwest airflow in front of the ridge leads the polar cold air to the south and accumulates in Siberia. As the trough east of the high-pressure ridge in the Urals Mountain moves eastward, the cold air also moves eastward and southward, forming this cold wave process that affects China.

Fang Yi said that in the process of moving eastward and southward, on the one hand, cold air goes directly southward and meets warm and humid airflow in the southern region to form precipitation; On the other hand, the low trough deepens, and a frontal cyclone is formed at the bottom layer in front of the trough. Warm and humid air is continuously transported to the northeast in front of the cyclone, and cold and warm air meet in the northeast, which will form a blizzard.

Features-wide influence range, fast moving speed of cold air and complicated weather system.

The blue warning of cold wave issued by the Central Meteorological Observatory on June 5438+065438+1October 2 1 shows that from June 2 1 to June 23, there will be northerly winds of grade 4 to 6, gusts of grade 7 to 9, and the temperature will drop by 6℃ to 10℃. Among them, eastern Huanghuai, Jianghuai, central and eastern Jiangnan and other places.

In this regard, Fang Yi pointed out that the cold wave process has a large influence range, the cold air moves fast, and the weather system is complicated.

After moving eastward and southward, the cold air will quickly sweep across most parts of central and eastern China, bringing strong winds, cooling and precipitation. Among them, the temperature drop in the south is slightly higher than that in the north. This is mainly because the temperature in the early south is slightly higher than normal, and the cooling rate is relatively large.

The cold wave moves faster. 2 1 In the morning, the cold front is still in the north of North China, and it will affect South China at night. Fang Yi said that the speed of the cold wave is mainly related to the weather situation. In this process, the moving speed of cold air is faster than the last cold wave, which is closely related to the strong "thrust" of the middle and lower turning flow.

In addition, the weather system under the influence of cold wave is relatively complex. For example, there are blizzards, big blizzards and even local blizzards in Northeast China. There is little to moderate rain in the southern region; There may be sand blowing or floating dust in northern North China. It can be said that the weather stage presents a pattern of "letting a hundred flowers blossom".

Comparison of two cold waves-lack of water vapor, there was no obvious snowfall in North China this time.

Most netizens in North China were impressed by the snowfall brought by the cold wave at the beginning of 165438+ 10, but why was there no obvious snowfall in North China this time?

Fang Yi thinks there are two reasons. One is that during the last cold wave, the trough bottom extending from Mongolia to China was farther south than this time, and the southwest airflow at the trough bottom and in front of the trough would carry warm and humid airflow to North China, causing snowfall. In addition, in the last process, there was a tropical system near the East China Sea, and the east wind and southeast wind on the north side of the tropical system continuously transported water vapor to North China, which was also a favorable factor for the formation of snowfall.

In this process, there is no corresponding water vapor transported to North China, and even if the temperature drops to a very low level, there is no obvious snowfall.

Disadvantages of cold wave

1, gale

When the cold wave comes, there will usually be windy weather, mostly in the north and northeast of China, usually above level 5. The appearance of cold wave and windy weather will have a certain impact on people's travel. At the same time, windy weather is easy to cause colds and blow down surrounding buildings. Therefore, for the sake of safety, it is not recommended to go out in windy weather.

2. Blizzard

Cold wave will bring snowy weather. If it snows heavily, the road will be blocked, and then the telephone poles may be crushed, resulting in power failure. Therefore, we must do a good job in prevention and deal with the inconvenience caused by heavy snow in time.

Step 3 freeze injury

The cold wave will make the temperature very low, which will seriously cause freezing damage to plants and directly lead to plant death. Therefore, we must guard against the sudden drop of temperature to resist the freezing damage caused by the cold wave.