The strongest cold wave has hit since this winter. Why is it so cold these two days?

The strongest cold wave hit this winter, and everyone can feel that the weather is particularly cold these two days, mainly because the cold wave came, the temperature plummeted and the temperature difference was relatively large.

The temperature dropped suddenly, and many people changed directly from their light clothes to cotton-padded jackets. In the morning, they don't want to leave the warm bed and feel their hands frozen on the road. It's also cold to play with mobile phones. 165438+1On October 27th, the relevant early warning report was issued, mainly because of the cold wave. The yellow warning is expected to start around165438+1October 30th, which will affect most parts of China from west to east, especially China. The temperature in the north and parts of the Middle East will drop directly to 10℃.

When Deng Ya's cooling occurred, our country had entered the winter overnight, and the strong cold wave this winter was formed because of the overall reasons. First of all, we need to understand the powerful high pressure in Siberia. Because of the Siberian high, the weather will fall off the cliff. In winter, we will find that the heat dissipation and heat absorption capacity of the land area is lower than that of the ocean, especially in some high-latitude land areas, which are prone to radiation cooling, thus forming a cold core. At this time, heat will be lost here, which is also called cold source, and it is most obvious in some areas with higher altitude, especially in central Siberia and Mongolian Plateau.

In these areas called cold sources, the atmosphere above is relatively strong, so there is obvious contraction and subsidence when the temperature drops, and a strong cold high blood pressure center will also appear in the air near the ground, which is called Mongolian Siberian high. Because the winter wind here is relatively strong, the affected area is relatively wide, and finally cold air will appear and slowly move to some areas, causing cliff-like cooling.