Is the weather in Shaanxi so unstable this year? What is the omen?

The first reason is that we are in a La Nina state this year, that is, the SST in the equatorial eastern Pacific is below minus 0.5 degrees lower than normal, which has a very obvious impact on China's climate. Under the influence of La Nina phenomenon, the meridional circulation in East Asia is abnormal, which is very beneficial to the southward movement of cold air in northern China. It has given us a cold winter, so we can see that this cold winter has already appeared this year.

The second reason is that two conditions must be met when it snows or rains.

Warm, humid air from the tropics.

There is cold air from high mountain area.