Why is the weather unusually cold this year?

In the short term, the cold high pressure in Mongolia and Siberia this year, that is, the Asian high pressure is strong, and the cold air frequently goes south, which leads to the cold weather recently.

Let's take a look, but this is just a scientist's guess, which is not necessarily correct. You can refer to it

Cause analysis "La Nina" may lead to "cold winter"

Recently, it was reported that Europe may face a new low temperature of "once in a thousand years", and China and other Asian regions may not be spared. This abnormal climate is related to the "La Nina" phenomenon that interferes with the ocean warm current activities. Yesterday, experts from Yunnan Climate Center told reporters that La Nina will also affect Yunnan, so that this winter in Yunnan may no longer be a "warm winter" but a "cold winter" in recent years.

According to experts, from June last year to April this year, the northern hemisphere was shrouded in the state of "El Ni? o", and the seawater in the equatorial Middle East Pacific was unusually warm. The change of atmospheric circulation was closely related to the seawater temperature, so there was obvious high temperature and dry weather. However, since June this year, the warm level in the Middle East and the Pacific has turned into a cold level, which has also turned the current situation of El Ni? o into a La Ni? a phenomenon, and the weather situation is completely opposite to last year. In other words, it is La Nina that makes the atmospheric circulation abnormal and makes the cold air in the north active. Recently, it has been raining continuously in Yunnan.

To put it simply, when in the "El Nino" phenomenon, the cold air activity in the northern hemisphere will be weak, and it is easy to have warm winters; When "La Nina" phenomenon appears, the probability of cold winter in the northern hemisphere will be greater. For example, when La Ni? a phenomenon appeared this year, the sea surface temperature in the western Pacific was high, which was prone to strong convective weather, and the typhoon caused by it was also active. In addition, the subtropical high is strong to the west, which is conducive to the westward movement of the vaginal typhoon. This is one of the reasons why more and more typhoons landed this year. Coupled with the strengthening of the southwest wind in the Bay of Bengal, the water vapor transport is obvious, which is also the reason why there have been more rainy weather in Yunnan since June+10 this year, and everyone feels that the weather is getting cold.