The day after tomorrow on January 6th, we will usher in a precipitation weather with moderate snow and rain. At the same time, a cold wave of cold air will also set off for the south, bringing large fluctuations in local temperatures, up to 10°C.
Recently, three rounds of cold air have taken turns, bringing us cold weather. This frequent cold air activity is due to the continuous transport of cold air from the north to the south, forming a cold air front. This phenomenon is relatively common in winter, but this year's cold air activity is unusually frequent.
At the same time, the phenomenon of inverted temperatures in the north and south has also attracted people's attention. Normally, temperatures in the north are lower than in the south, but recently there have been cases where the south has been warmer than the north. This unusually warm weather phenomenon such as that of March is partly related to the frequent cold air activity.
On January 7th and 8th, we will have another rainy day. This precipitation was mainly due to the formation of an upper-air trough. An upper-air trough is a zone of low pressure that forms at high altitude, which brings strong updrafts and unstable weather conditions that trigger precipitation.
Certain conditions are required for the formation of high-altitude troughs. First, there needs to be an adequate supply of water vapor, usually from the ocean or lake. Secondly, there needs to be a strong updraft, which can be caused by the intrusion of cold air or the undulation of the terrain. Finally, there are also certain dynamic conditions, such as changes in the wind field.
Overall, the weather has been unusually mixed recently. Frequent cold air activities, inverted temperatures from north to south, and the formation of high-altitude troughs are all important factors leading to weather changes. For everyone, it is necessary to pay attention to the weather forecast in time, and take measures to protect against the cold and keep warm to ensure their own safety and health.