What is the strongest in the intensity classification of cold air?

Cold wave is the strongest in the classification of cold air intensity.

According to the classification standard of meteorological department, the cold air in China can be divided into four grades, namely weak cold air, strong cold air, strong cold air and cold wave.

First of all, weak cold air refers to a weather phenomenon with weak influence of cold air. When weak cold air strikes, the temperature will drop, but the range is relatively small, which has little impact on people's lives. In most cases, weak cold air will only bring haze in the sky and a slight drop in temperature, and people can easily cope with it as long as they add clothes appropriately.

Secondly, strong cold air is a medium-intensity performance of cold air. When strong cold air comes, the temperature will drop obviously and the chill will become more obvious. At this time, people need to increase warm-keeping measures and put on thick clothes to avoid being attacked by the cold. At the same time, strong cold air will also bring weather changes such as increased wind speed and cloudy sky, so you should pay attention to safety when going out.

In addition, strong cold air is a stronger expression of cold air. When strong cold air affects a place, the temperature will drop sharply and the weather will change obviously. In addition, strong cold air will be accompanied by strong winds, rain and snow, which will bring some inconvenience to traffic, production and life.

Finally, the cold wave is the strongest performance of cold air level. The cold wave strikes, the temperature drops suddenly, and the cold degree is very high, which has brought great influence to people's life and work. At the same time, the cold wave may also cause problems such as freezing and road icing, which will bring certain challenges to transportation and urban heating.

The influence range of cold wave

The cold wave that affects China is generally "born" near Xindi Island and Iceland. About 95% of the cold wave accumulated in western Siberia, just like passing through a "gas station" and then affecting China in three ways, generally affecting the middle and lower reaches of the Yangtze River and Jiangnan, and some even reaching South China.

Most parts of China may be affected by cold wave weather. Except Qinghai-Tibet Plateau and Yunnan-Guizhou Plateau, there are obvious cold wave weather in other areas, especially in northwest, northeast, north China and the middle and lower reaches of the Yangtze River.

During 20 16, 65438+1October 2 1 to 25, the cold wave in Wang Ba swept through most parts of China, with the cumulative cooling rate reaching 12 ~ 18℃ in many places, and exceeding 18℃ in some places. Affected by the cold wave process, the area where the temperature dropped above 6℃ covered 9.0 1% of the country, and the affected population was11800,000.