Weather, cold air in winter

Cold air is coming again! The Central Meteorological Observatory predicts that there will be a strong cold air affecting China, and the temperature in most areas will drop by 6 ~ 8℃, and the local temperature will be above 10 ~ 12℃. Every winter, cold air is the "protagonist" of China's weather stage, often occupying the C position. Where does the cold air come from? Where do you like to go best? Everything you want to know about cold air is here! Not all cold air is called cold wave. Cold air is a kind of air mass, which will reduce the temperature of the place where it passes. Some cold air is just a small fight, bringing some temperature fluctuations; There are also cold and domineering, creating a wide range of rain and snow to cool down. There are different names for the cooling capacity of cold air, which are weak cold air, strong cold air, strong cold air and cold wave.

Where does the cold air come from? The cold air that affects our country originated in the Arctic and then went south through Siberia. Siberia is the cold center of the northern hemisphere, like a "gas station" for cold air. Because of its high latitude, high altitude and being located in the mainland, it gets less heat and dissipates quickly. Cold air accumulates and accumulates energy here, and then under the guidance of high-altitude northwest airflow, it finally erupts and continues to affect China southward. Why is the intensity of cold air strong and weak?

The strength of cold air is mainly reflected in the cooling range, so the strength of cold air depends not only on the strength of cold air itself, but also on the basic temperature of the affected area. If the cold air itself is very strong and the basic temperature in the passing area is high, resulting in severe cooling, it may reach the intensity of the cold wave. If the intensity of cold air itself is average and the temperature in the passing area is low, resulting in a small cooling range, it is a weak cold air process. So the cold wave usually appears in late autumn or early spring, because at this time, the cold air in the Arctic begins to strengthen, and the temperature in China is relatively high. As the saying goes, you climb high and fall badly, and the temperature drops the most when cold air comes.

How fast does cold air run? Cold air with different intensities moves at different speeds, and weak cold air moves faster than strong cold air and cold wave. The speed of cold air with different intensities moving on land is 20 to 80 kilometers per hour, with an average of 50 kilometers per hour, which is equivalent to the speed of cars driving on urban roads. Where does the cold air like/dislike going? Influenced by latitude, geographical location, topography and other factors, cold air activities in China are more in the north than in the south. Northern Xinjiang, near Xilinhot in Inner Mongolia and eastern Jilin are the areas with the most frequent cold air activities. Western Yunnan, Guangdong, Guangxi and Sichuan Basin are the areas with the least cold air activity.