Many places in Ningxia issued orange warning of sandstorm. Why do sandstorms occur in several cities at the same time?

After the super sandstorm in Beijing, sandstorm warnings appeared in many cities in the north. 14 On March 5th, Ningxia Meteorological Observatory showed that sandstorms began to appear in Yinchuan and Shizuishan in the middle of the night after 14, and the visibility was between 100 and 500m. Many netizens even said that they were awakened in the middle of the night, and some netizens ridiculed that girls don't have to sprinkle powder when they go out today and expose their faces to the air for ten minutes. Ningxia Meteorological Observatory issued 14 orange warning of sandstorm at 4: 00 am on June 5438+05, asking all relevant departments to pay attention to the influence of strong winds, sandstorms and reduced visibility. Take precautions when the sandstorm may continue to go out.

The yellow warning of sandstorm was upgraded in the early morning of March 15, the central meteorological day when sandstorms occurred in northern 12 province. Meanwhile, it is reported that the northern part of China 12 provinces will be hit by sandstorms, including Beijing, Tianjin, Hebei, Xinjiang, Inner Mongolia and Heilongjiang. This is the first large-scale sandstorm in China in recent ten years, and the air index in North China and Northwest China has been out of the chart for 15 days.

According to the information of the comprehensive evaluation office of satellite images and ground monitoring information of desertification detection center of China Forestry and Grassland Bureau, the source of this sandstorm comes from Mongolia. /kloc-in the morning of 0/4, a sandstorm appeared in the southwest of Mongolia, and gradually moved southward with the airflow, invading the northern cities of China. According to the news published on the website of the General Administration of Economic Situation of Mongolia, sandstorms have caused 9 deaths and 586 people are missing. Sandstorm occurred in Mongolia at the beginning of the year, and the temperature rose, but there was no rainfall, resulting in dry ground, but vegetation did not grow on the ground. The spring monsoon came, which rolled up the sand on the ground and formed a sandstorm.

The sandstorm happened in the north at the same time, which is very coincidental and has the characteristics of wide range and high intensity. At the same time, it invaded 12 provinces in the north of China, which made many people wonder why even the northwest was implicated if the sandstorm from Mongolia hit the north the most. In fact, there are sandstorms in northwest China every spring, but the weather is not as strong as this one. Sandstorms occur simultaneously in many places, which is closely related to monsoon climate and temperature. North China belongs to temperate continental climate zone, and westerly winds prevail in March and April every year. In addition, with the arrival of spring, the temperature in northern China and Mongolia is rising, the precipitation is less, and there is too much exposed sand on the ground. Under this condition, when the wind rolls up the dust exposed on the ground, sandstorms are formed. Therefore, driven by the monsoon, northern China 12 provinces will encounter sandstorms at the same time.