Cold wave and strong wind warning! my country is experiencing a sharp drop in temperature from north to south. Has your "long johns DNA" changed?

The Central Meteorological Observatory continues to issue yellow warnings for cold waves and blue warnings for strong winds. The second cold wave process since this autumn and winter has begun to affect the central and eastern regions of my country. Affected by the cold wave, the temperature in the middle and lower reaches of the Yangtze River and the areas to the north of it will drop, and most of the northeastern region will have rain and snow.

A quick chart shows how the cold wave "conquered" my country

Video source: Central Meteorological Observatory

The Central Meteorological Observatory predicts that on the morning of the 24th, the lowest temperature of 0℃ will be located in central Jiangsu and Anhui to central and southern Henan, southern Shaanxi, southeastern Gansu and other places. The lowest temperature in central and eastern Inner Mongolia and most of Heilongjiang will drop below -20℃, and locally may reach below -30℃.

From the 23rd to the 24th, most of the above-mentioned areas will be accompanied by northerly winds of 4 to 6, with gusts of 7 to 8, and locally 9. From the 23rd to the 25th, strong winds of 6 to 8, with gusts of 9 to 10, will occur successively in the eastern and southern sea areas of my country.

Image source: China National Meteorological Administration

From the perspective of rain and snow, from 14:00 on the 22nd to 14:00 on the 23rd, parts of central and eastern Heilongjiang, Changbai Mountain area of ​​Jilin and other places will have heavy to severe snow, and local heavy snow (20 to 22 mm) will occur in central Heilongjiang . The new snow depth in the above-mentioned areas is 4 to 12 cm, and it may reach more than 16 cm in some places. Due to the heavy snow accumulation in Heilongjiang in the early stage, after this round of snowfall, the snow depth in some areas may reach 30 to 40 cm, and more than 50 cm in some places.

The precipitation rankings in the past 24 hours are all moderate to heavy rain (10-25 mm), but this is pure snow, which is equivalent to blizzard (more than 10 mm) and severe blizzard (more than 20 mm) levels...

Image source: China National Meteorological Administration

When a cold wave hits, how can we respond scientifically?

01 What exactly is a cold wave? Is it the same as cold air?

The so-called cold wave is a severe weather process in which strong cold air from northern my country invades southward on a large scale like a tide, causing a sharp drop in temperature over a large area and producing strong northerly winds.

Cold waves require the accumulation of cold air and are a type of disastrous weather, but that does not mean that all cold air invasions are called cold waves.

China's meteorological department stipulates that a cold wave is defined as a cold air intensity level in which the temperature drops by 10 degrees Celsius or more and the absolute value of the negative temperature deviation is greater than or equal to 5 degrees Celsius .

At the same time, due to the influence of geographical environment and climatic conditions in different places, the standards for cold waves are also different.

Generally speaking, cold waves start as early as late September and end as late as May of the following year. March in spring and October and November in autumn are the seasons when cold waves and strong cold air are most frequent, and are also the periods when cold waves and strong cold air may cause the most damage to production activities.

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02 Such a powerful cold wave actually has its advantages?

First, cold waves help the heat exchange on the earth's surface. Cold waves carry a large amount of cold air to the tropics, causing large-scale heat exchange on the ground, which helps maintain the ecological balance of nature .

In addition, meteorologists believe that cold waves are a guarantee of good weather and good harvests. China is affected by the monsoon, and the climate is dry in winter, which is a dry season. But whenever a cold wave invades the south, it often brings large-scale rain and snow weather, which helps to alleviate the drought of crops in winter . In addition, the low temperature brought by the cold wave can increase soil moisture, kill a large number of pests and pathogens lurking in the soil for the winter , or inhibit their growth, which is beneficial for crops to survive the winter.

03 The cold wave is coming, how can we defend ourselves?

The cold wave brings a sudden drop in temperature. If you don't put on more clothes to keep warm in time, you will not only be easily chilled and catch a cold, but the low temperature stimulation will also cause blood vessels to constrict, which can easily aggravate the condition of patients with cardiovascular and cerebrovascular diseases. You must pay attention to keeping these parts warm:

Head : Cold air invading the head can cause colds, rhinitis, headaches, toothaches, trigeminal neuralgia , etc. It is recommended to wear a hat when going out to protect your head when the temperature drops suddenly;

Mouth and nose : The mouth and nose are the passages for air to enter and exit. As people breathe, cold air enters the lungs, causing nausea, vomiting, coughing, spitting, nasal congestion, sneezing, etc. It is recommended to wear a mask when going out to prevent cold. Washing the nose with cold water every morning and evening is beneficial to enhance the immunity of the nasal mucosa and is a good way to prevent and treat rhinitis.

Navel : The barrier function of the navel is poor, it is extremely easy to get cold, and it is also most afraid of cold . It is very important to protect our navel, otherwise it is easy to cause colds and other diseases.

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Waist : The waist is closely related to the movement of the lower body and the support of the upper body. If you get cold, it will cause physical discomfort and disease. You can add a close-fitting vest or autumn clothes to prevent the invasion of cold air. If you have a waist disease, it is best to keep your waist and abdomen warm. You can buy a waist protector to prevent your waist from getting cold.

Feet : Choosing the right socks and a pair of shoes that fit and keep you warm is essential. In cold weather, soaking your feet in hot water can promote blood circulation in your feet and relieve a day's fatigue. In addition to these ways to keep your feet warm, you can also keep them warm through proper exercise.

The most important thing is: wear long johns! Drink hot water ! Wearing long johns properly can improve the body's ability to resist cold and avoid colds and other diseases. At the same time, you should also pay attention to the selection and matching of long johns, and choose long johns with good breathability and moderate tightness.

Eat more fresh fruits and vegetables, and supplement with multiple vitamins to improve immunity.

For safe travel, please slow down when driving, correctly identify the wind direction, hold the steering wheel firmly, increase the distance between vehicles, and pay attention to sudden changes in wind direction or large bends in the road when driving against the wind. Pedestrians and vehicles should not stay under tall buildings, temporary buildings such as billboards, or trees.

Comprehensive sources: Xinhua News Agency, People's Daily Online, Central Meteorological Bureau, China Fire Protection, etc.