When will this cold wave end?

On the morning of 12, 2023 10, the Central Meteorological Observatory lifted the blue warning of cold wave.

However, from February/KOOC-0/6/KOOC-0/4 in 2023 to February/KOOC-0/7 at 8: 00 in 2023, there will still be a temperature drop of 4-8℃ in the eastern part of Northeast China, southern part of North China, eastern Jianghuai, eastern Jiangnan and southern China, among which the local temperature drop can reach 8-650.

The Central Meteorological Observatory issued a yellow warning of low temperature on February 6, 2023 10. Affected by the cold wave and subsequent cold air, the temperature in most parts of China will continue to be low in the coming week. In the morning of June 5438+February 65438+July, 2023, the lowest temperature line of 0℃ can be pressed to the south of Guizhou and the north of Jiangnan, and the-10℃ line is located between the north of Huanghuai and the Qinling Mountains.

The cold wave usually lasts for 3 to 7 days, and the longest lasts for 7 to 10 days. In winter in China, cold waves usually occur once every 3-8 days, but relatively strong cold waves average about 4 times a year. From the end of 10 to the end of the following year 10, cold waves also occurred in late February in some years.

Cold weather usually ends in March. Cold wave weather refers to a weather phenomenon that a cold current passes through this area, which will cause a sharp drop in temperature, accompanied by strong winds and precipitation. The winter half year is characterized by strong winds and cooling. There is a strong wind behind the cold front, and the general wind speed at sea can reach 5-7 and 6-8. The duration is mostly 1-2 days. In China, there is a northwest wind in the north, a north wind in the middle and a northeast wind in the south.

Benefits of cold wave

Meteorologists believe that the cold wave is the guarantee of living and working in peace. China is affected by monsoon, and the winter climate is dry, which is a dry season. However, whenever the cold wave invades the south, it will often bring a wide range of rain and snow weather, alleviate the winter drought and benefit crops.

The reason why the peasant proverb "snow is auspicious and abundant" can be spread among the people for ages is because the nitrogen content in snow water is high, which is more than five times that of ordinary water, which can greatly increase the nitrogen in the soil. Snow water can also accelerate the decomposition of soil organic matter, thus increasing the organic fertilizer in the soil. The heavy snow covered the overwintering crops and played the role of a quilt, keeping out the cold and keeping warm.

There is a saying that "winter is not cold, and the coming year is not abundant", which also has its scientific truth. Experts in crop pest control believe that the low temperature brought by the cold wave is the most effective natural "insecticide" at present, which can kill a large number of pests and germs lurking in the soil for the winter, or inhibit their reproduction and reduce pests and diseases in the coming year. According to the survey data of agricultural technology stations around the country, pesticides can be saved by more than 60% in the year of heavy snow freezing.

Cold waves can also bring wind resources. Scientists believe that wind is a valuable energy source without pollution. The power generation efficiency of the world-famous Miyakojima wind power station during the cold wave is 1.5 times that of the usual one.

The Central Meteorological Observatory lifted the blue warning of cold wave today 10.