China News Service, Beijing, July 2 (Chen Hang) On the 2nd, the reporter learned from the Beijing Meteorological Department that due to the combined influence of cold air and southerly warm and humid airflow, there was a significant rainfall in Beijing from the night of 2nd to tomorrow noon process. Since the southwestern jet brings sufficient water vapor in the Yellow Sea and Bohai Sea, and the convergence conditions are good, the precipitation lasts a long time. This process will be the most obvious rainfall since the flood season this year (June 1).
According to Zhao Wei, chief forecaster of the Beijing Meteorological Observatory, there will be thunderstorms or showers in Beijing during the day on the 2nd. The rainfall is unevenly distributed, and the local short-term rain intensity is relatively large; the main rainfall period is at night, and the rainfall in most areas is moderate rain (15 -25 mm), the northern part of the west is larger, and can reach heavy rain (about 50-80 mm), accompanied by short-term heavy precipitation, and the maximum hourly rainfall intensity is about 40-50 mm.
Zhao Wei mentioned that in early July, cold air activities in North China are more frequent, and Beijing will enter the rainy season.
From noon to night on July 1st, scattered thunderstorms occurred in Beijing. Rainfall mainly occurred in the northern region. Local rainstorms occurred in Yanqing, Huairou and Miyun; hail occurred in Pinggu, Shunyi, Miyun, Huairou and Changping, with a maximum diameter of 2 cm. ; Miyun, Huairou, Pinggu, and Tongzhou have local short-term strong winds above level 6.
From 12:00 on July 1 to 10:00 on the 2nd, the average rainfall in Beijing is 13.6 mm, the urban area is 0.6 mm, the northwest is 34.8 mm, the northeast is 25.3 mm, the southwest is 3.9 mm, and the southeast is 0.2 mm; the largest rainfall occurs in Yanqing The wild duck lake wetland was 117.2 millimeters. The maximum hourly rain intensity occurred in Fangliang Village of Mentougou. The rainfall was 44.8 millimeters at 21-22 hours on the 1st.
Zhao Wei said that according to the analysis of current meteorological data, it is expected that there will be more thunderstorms in Beijing from July 4 to 10.
Zhao Wei emphasized that due to the uncertainty of forecasting science itself, especially the rapid changes in the weather system in summer, the locality and suddenness of convection are strong, and changes in the location and movement speed of the weather system will give rainfall levels and zones Because of the large differences, and because Beijing is greatly affected by the complex topography of the mountainous area, the extreme values of the heavy rainfall center and the forecast uncertainty of the landing zone are relatively large, and further research and judgment are needed based on the evolution of the rainfall system.
Beijing Meteorological Department reminded that there are obvious rains in the mountainous areas of Yanqing, Huairou, Miyun, etc. There are still heavy rains from the night of 2nd to tomorrow noon. It is necessary to pay attention to the secondary effects of rainfall, such as flash floods, landslides, and collapses, and the public should try to avoid them Travel in mountainous areas, away from river courses and geological hazards. Heavy rainfall will cause slippery road surfaces, water accumulation in low-lying areas, and reduced visibility. The public and outdoor epidemic prevention staff should pay attention to lightning protection, rain protection, and wind protection; carry rain gear when traveling, and pay attention to safety when driving. During thunderstorms, strong convective weather such as local short-term heavy rainfall, thunderstorms, strong winds and hail may occur. (Finish)