How is the cold air formed and how long will it last?

As time goes on, the weather is getting colder and colder, and cold air is about to invade, but few people know how cold air is formed, so we need to know how cold air is formed. Will all-round cold air sweep? How long will the cold air last? Many friends want to know the answer to this question. Let's have a quick look.

How is cold air formed?

Cold air is air located in the low temperature area of the earth. Most cold air masses are formed in the polar regions and Siberia. If cold air comes, it will cause a wide range of cooling. It has a range of thousands of kilometers and a thickness of several kilometers to dozens of kilometers. Cold air crossing the border will bring rain and snow. , will make the temperature plummet. When we watch the weather forecast, we often hear the host say that "there is a cold air coming from Siberia" when introducing the cold air, which is actually the source of the cold air. Cold air, such as tidal surge, affects a wide range, reaching more than 2000 kilometers. Because the moving path is different, the influence area is also different. The time and scope will also be different. If cold air comes from Siberia, it will cause the temperature in the passing area to drop sharply. The temperature difference can reach more than ten degrees, which is very scary.

All-round cold air will sweep through

At present, an "all-round" cold air is brewing, which will sweep across most parts of China in the middle and late this week. The impact time is long, the temperature drops sharply, and the wind brings rain and snow, which may reach the cold wave standard and have enough strength to freeze and cry you. By then, the temperature in the north will drop by more than 10℃, and there will be the first round of heavy snowfall in the northeast and snowfall in north China this winter. Recently, cold air rarely steals the lens of the weather stage. Although it appears frequently, it belongs to "small fights". However, a cold air is brewing and will take off later this week. Hu Xiao, chief meteorologist of China Weather Network, analyzed that from June 4 to 7, 165438+ cold air will affect China from west to east, and the temperature in most areas will drop by 8 ~ 10℃, and the cooling range in some areas can reach 12 ~ 15℃ and local/kloc-0. Compared with the cold wave of 5438+ 10 in mid-June, the impact of this cold air may be stronger, which is the most extensive one in China in the second half of this year. Judging from the current forecast, this cold air is likely to reach the cold wave standard, which can be said to be a "quasi-cold wave", and it has enough power to freeze you to death. On the 4th, cold air first affected Xinjiang, and then moved eastward and southward to blow cold air all the way to South China. Affected by this, the temperature drop in the north generally exceeds 10℃, and the maximum exceeds 15℃, and the temperature drop in many places in the south will also reach about 10℃. Among them, the temperature fluctuation in northwest and northeast China is the most obvious. After the cold air passes through the border, it will quickly switch between cold and warm, freezing like an "ice hole".

How long will the cold air last?

It usually lasts about a week. There will be several rounds of cold air this winter. The duration of each round of cold air is different, and most of them will last for about a week. Cold air is air located in the low temperature area of the earth. If cold air comes, it will cause a wide range of cooling. In fact, cold air usually comes from Siberia or the Arctic Ocean. When we watch the weather forecast, we often hear the host say "there is a cold air from Siberia" when introducing the cold air, which is actually the source of the cold air. Siberia and the Arctic Ocean are very cold areas, where the temperature can generally reach tens of degrees below zero. If the cold air comes from Siberia, the temperature in the area it passes through will drop sharply. This temperature difference can reach more than 10 degrees. This cooling rate is terrible. Especially in winter, you may feel the feeling of spring entering winter overnight, and cold air will be accompanied by weather changes such as rainfall and even snowfall. If the weather is severe, it is likely that there will be bad weather such as hail. Especially after the serious greenhouse effect, some strange climate changes often occur. There may be hail when cold air comes in June. But the intensity of cold air is different every time. Sometimes it is strong, sometimes it is weak, so it has different effects on areas affected by cold air.

Can cold air cause rhinitis?

Patients with allergic rhinitis are type I allergic reactions caused by decreased body resistance, belonging to allergic reactions. Pathogens stimulate nasal mucosa to cause allergic rhinitis symptoms, such as nasal itching, nasal congestion, sneezing, runny nose and so on. It's caused by decreased resistance. Cold air is not an allergen, but an inducement. Allergens exist in the outside world and food. There are dust mites, pollen and animal fur outside, and foods are high protein, seafood and fruits. Cold air is only an inducement, not a real allergen. Patients with allergic rhinitis have allergic reactions due to decreased resistance, and they need to strengthen their physique to effectively fight allergic reactions.