The Nanjing Meteorological Observatory issued a blue warning for strong winds. How does the cold air form?

The Nanjing Meteorological Observatory issued a blue warning for strong winds. How does the cold air form? 1. The cold air comes from the Arctic Ocean at first, and then strengthens through Siberia. Due to their higher latitudes, these areas have long nights, short days and little sunshine in winter. In the polar regions, there is even polar night, where the sun never shows its face. Therefore, the Earth receives very little heat from the Sun; however, at night, the ground loses significant amounts of heat by radiation to space. As the ground continues to cool, the air temperature near the ground becomes lower and lower, and more and more cold air will gather together. Under the guidance of the northwest airflow, this pile of extremely low-temperature cold air will advance from north to south, affecting Mongolia, North China, East China or most of my country.

2. Cold air is the air in areas with very low temperatures on the earth. If cold air comes, it will cause widespread cooling. In fact, cold air usually comes from Siberia or the Arctic Ocean. When watching the weather forecast, we often hear the host say "there is a cold air coming from Siberia" when introducing the cold air. This is actually where the cold air comes from. Siberia and the Arctic Ocean are very cold areas, with temperatures generally reaching dozens of degrees below zero. If cold air comes from Siberia, it will cause the temperature of the area it passes to drop sharply, and the temperature difference can reach more than ten degrees. This kind of cooling is very scary, especially in winter. You may feel the feeling of winter overnight in spring, and the cold air will be accompanied by weather changes such as rainfall or even snowfall.

3. As we all know, it gets dark early in winter, and the night is often longer than the day, but there is no sunlight during the day, so there is a lack of heat from the sun. That is to say, the lowest temperature of the day is around two o'clock in the morning. At this time, the temperature will continue to drop, so you will feel cold. Cold is also related to dimensions. Generally speaking, the higher the dimension, the lower the temperature. For example, the North Pole and the Antarctic are both very high-dimensional places and are in a state of ice and snow all year round.