Influence and harm of northeast cold vortex on weather

The northeast cold vortex is a cold air column from the ground to more than 6000 meters. At least one closed contour line with cold center or obvious cold trough can be analyzed on the 500 hectopascal weather map. The air column in the cold vortex is in an unstable state, which often produces unstable weather such as showers, thunderstorms and even thunderstorms and hail. Sometimes, the strong development of cold vortex will also cause a wide range of heavy rain. When the cold air column rotates counterclockwise, a cold air will be thrown out to produce precipitation. As the northeast cold vortex is a deep weather system, it moves slowly for a long time, usually for 3 ~ 5 days, and the longest can reach 10 days, which brings low temperature and rainy weather for several days, or causes intermittent rainy weather for several days.

The northeast cold vortex is an important weather system that causes sudden severe convective weather such as low temperature damage, continuous rainfall and floods, hail, thunderstorms and strong winds in Northeast China, and has a great impact on the weather and climate in Northeast China.

The cold vortex weather in northeast China in spring and summer is very harmful to agriculture and animal husbandry. Low temperature affects the spring sowing or seedling growth of rice, sorghum, corn, soybean and other crops, resulting in a reduction in autumn grain production. In pastoral areas, pasture can't turn green in time, and cattle and sheep lose weight because of lack of feed. According to the different low temperature time, the impact on crops is also different. The low temperature in June prevented crops from growing normally and delayed the growth period; In August, crops are in the stage of dry matter accumulation during grain filling, which requires high temperature and sunny weather. Low temperature is easy to cause grain shortage or empty shell, reducing yield.