What does the cold wave mean? What harm will it bring?

It's already November, and the weather is getting colder. I heard that there will be a cold wave in some places. What does this cold wave mean? What harm will the cold wave bring us?

What does cold wave mean?

Cold wave is a natural weather phenomenon. Refers to the cold air from high latitudes, which rapidly strengthens and invades the middle and low latitudes in a specific weather situation, causing large-scale severe cooling, strong winds and rain and snow weather along the way. When this cold air reaches a certain standard, it is called a cold wave.

What harm will the cold wave bring

1. Gale

When the cold wave comes, windy weather usually occurs, mostly in the north and northeast of China, generally above level 5. After the cold wave and windy weather appear, it will have a certain impact on people's travel. At the same time, windy weather is easy to cause colds and blow down buildings around them. Therefore, for the sake of safety, it is not recommended to move outside in windy weather.

2. Snowstorm

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

3. Freezing injury

Cold wave will make the temperature very low, which will seriously cause freezing injury to plants and directly lead to their death. Therefore, we must take precautions against the sudden drop of temperature, so as to resist the freezing injury caused by cold wave.

The cold wave process from the north to the south is coming

The cold wave has swept over 9% of the country, which will cool down the current gale, rain and snow

With the approach of the cold wave, the gale, rain and snow will all come from November 4, and more than 9% of the country from north to south will be frozen into a ball due to the strongest cold wave in the second half of the year.

From the map of the national cold wave process, on November 4th, the impact of the cold wave on China officially kicked off, which will take the lead in affecting northern Xinjiang. On November 5, it will affect most of Xinjiang and the central and western parts of northwest China.

on November 6th, the cold wave expanded rapidly, and it will push eastward and southward, which will affect the eastern part of northwest China, north China, northeast China and the northern part of southwest China, and the temperature will plummet.

on November 7, the cold wave will continue to move eastward and southward, covering the southern region, and the eastern part of the southwest region and most of the south of the Yangtze River will feel the chill.

On November 8th, the cold wave crossed Nanling, and even South China, where cold air has always been beyond the reach, will feel the power of the cold wave this time.

this round of cold wave is threatening, and its influence scope, duration and cooling degree will crush the strength of the first cold wave in the second half of October, not to mention it. Why is this cold wave so fierce? Hu Xiao, chief meteorologist of China Weather Network, analyzed that, first of all, a large amount of cold air accumulated in the Arctic; Secondly, recently, influenced by the warm ridge of the Urals Mountain, warm air seized the territory of cold air in the Arctic, which made cold air go south and continue to accumulate in large quantities in western Siberia, resulting in a very strong cold air force in the south.

if the cold wave "standby" time exceeds one week, the minimum temperature will be low in a large area. In addition to a wide range of influence, the "standby" time of this round of cold wave is also very long, which will affect the mainland of China for more than one week. Hu Xiao introduced that the reason why this round of cold wave affects the "front" is long-lasting. First, the cold air affects China from the west path, starting from northern Xinjiang and moving from northwest to southeast at a slow speed; Second, in the process of cold air moving eastward, some high-altitude trough evolved into cold vortex, which further slowed down its moving speed and lingered in Inner Mongolia to Northeast China for a long time. This weather situation will guide supplementary cold air to join and go south continuously, thus prolonging the overall impact time of this round of cold wave process, and the cold is endless.

judging from the degree of cooling, the temperature contrast before and after this cold wave is very strong. The Central Meteorological Observatory predicts that during the cold wave, the temperature in most parts of China will drop by 8 ~ 1℃ successively, with the drop of 12 ~ 14℃ in parts of northwest, north China, Huanghuai, western Jianghuai and southern part of Northeast China, and the local drop of more than 16℃. The reversal of cold and warm is mostly completed in one to two days, and many places will experience seasonal cooling such as "winter overnight" and "autumn every other day". In a big city, like Urumqi, the highest temperature is around 14℃ on the 3rd, and it will plummet to around -5℃ on the 4th, with a drop of up to 19℃ in a single day, as if suddenly falling into an "ice hole"!

in addition, from the end of this week to the beginning of next week, the lowest temperatures in many places in the central and eastern regions will be refreshed to the lowest levels in the second half of the year, and the lowest temperatures in most parts of the north will fall below ℃, and the lowest temperatures in Jianghuai, Jiangnan and southwestern regions will mostly drop to single digits, while the lowest temperatures in many places in South China will also drop to around 15℃.

the cold wave pushes the season to change to the north or enter the winter in an all-round way

This long cold wave process will also push forward the change of the seasonal map of China. After the cold wave affects, most of the northern part of China will enter the winter in an all-round way, and the trace of summer will be "hard to find" in the inland areas of China.

Hu Xiao reminded that the performance of this cold wave process in terms of rain and snow is also obvious. The cold air has sufficient time to cooperate with the warm and humid airflow in the eastward movement, so the precipitation range will be very wide, and there may even be the development of ground vortex system, which will be transported to Northeast China, North China, Huanghuai and other places with water vapor, bringing rain and snow weather. Warm reminder, we need to pay close attention to the weather forecast and early warning information, make full preparations for cold and warmth, and pay attention to prevent the adverse effects of rain and snow on traffic.

Will the cold wave affect the aircraft?

Generally, the cold wave will not affect the flight, take-off and landing of the aircraft, as long as it is not a blizzard and the runway is severely frozen.