China News Service, Beijing, April 20 (Reporter Chen Su) The reporter learned from the Central Meteorological Observatory on the 20th that due to the influence of the Mongolian cyclone and the ground cold front, from the 19th to the 21st, there will be a large-scale windy sand and dust weather in northern China.
Rao Xiaoqin, chief forecaster of the Central Meteorological Observatory, said that the strong wind and sandy weather this time has the characteristics of "strong wind and great sand and dust impact". It affects most of northern China from west to east, and it is the largest large-scale windy and sandy weather process since the beginning of spring in the north.
According to the forecast, from the 20th to the 21st, there will be winds of magnitude 4 to 6 in eastern Xinjiang, Inner Mongolia, northern Northwest China, North China, northeast China, and the Yellow and Bohai Sea regions, with gusts of magnitude 7 to 9, and local level 10 or above.
Among them, the gusts in Inner Mongolia are 8-10, and the local level is above 11.
Affected by strong winds and sand and dust transmission, eastern Xinjiang and southern Xinjiang Basin, western Gansu, central western and southeastern Inner Mongolia, Ningxia, central and northern Shaanxi, central and northern Shanxi, central and northern Hebei, Beijing, Tianjin, central and western Jilin, and central Heilongjiang There are sand or floating dust weather in the west and other places, and there are sandstorms in the central and western parts of Inner Mongolia.
On the 21st, there was precipitation from west to east in the central, eastern and northeastern parts of Inner Mongolia, which was beneficial to the relief of sand and dust and the improvement of air quality in the above-mentioned areas. This sand and dust weather process is expected to end on the night of the 21st.
Rao Xiaoqin said that there are two reasons for this dusty weather process. One is that the Mongolian cyclone is relatively strong, which provides favorable thermal and dynamic conditions for sand removal and downstream transmission in the sand source area. The low precipitation and high temperature in northwestern China, central and western Inner Mongolia and other places lead to loose surface, while the vegetation has not recovered in spring, and the underlying surface conditions in the sand source area are favorable for sand formation.
It is reported that there have been 3 sand-dust weather events in China this year, including 2 sand blowing events and 1 sand-dust storm event. Compared with the same period of normal years, there have been 3 less sand-dust weather events. "specialty.
Experts suggest that the public needs to guard against the adverse effects of windy weather, strengthen outdoor structures and billboards, strengthen agricultural facilities, and protect the safety of outdoor high-altitude operations. Forest fire prevention.
Affected by the sand and dust weather, the air quality in the northwest, north China and parts of the northeast will deteriorate for a short time. The public should pay attention to health protection, and pay attention to wearing masks, gauze and other dust-proof products to prevent the sand and dust from causing damage to the eyes and respiratory tract; During the period of sand and dust weather, the visibility is low, and traffic safety needs to be paid attention to.
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