From this morning to the day, there was little to moderate rain in Beijing, local heavy rain accompanied by lightning, and the highest temperature was 30℃

The Beijing Meteorological Observatory issued a forecast at 6 o'clock on August 1 Sunday. From this morning to the day, it was cloudy with light to moderate rain, with local heavy rain accompanied by thunder and lightning. The east turned to the south wind level 2 or 3, with a maximum temperature of 30℃. Thundershowers turned cloudy at night, with a southerly wind level 2 or 3, with a minimum temperature of 25℃.

According to the latest weather forecast, the heavy rainfall in Beijing has finally weakened since today. It is estimated that most areas are mainly moderate to moderate rain, but there is heavy rain locally. In addition, we should take precautions after the rainstorm, especially in mountainous areas.

Yesterday, it was still a rainy day in Beijing. According to the field monitoring, from 20: 00 on July 29th to 6: 00 on August 1 day, the average rainfall in Beijing was 257.9mm, and that in the urban area was 235.1mm.. The maximum rainfall in the city occurred in Wangjiayuan Reservoir in Changping, reaching 736.8mm, and the maximum hourly rainfall intensity was in Qianling Mountain, Fengtai, from 10 to 1650 yesterday.

Today, the rainfall in Beijing will be significantly weakened, with small to moderate rain in most areas. According to the forecast of Beijing Meteorological Observatory at 6 o'clock this morning, there will be moderate to moderate rain in Beijing from this morning to the daytime, with local heavy rain accompanied by lightning. The east will turn to southerly winds of 2~3 and 4, with the highest temperature of 30℃. Thunderstorms will turn cloudy at night, with southerly winds of 2~3 and the lowest temperature of 25℃.

Meteorological department analyzes Beijing's "strongest rainfall this year"

The reason why this heavy rainfall in Beijing is called "the strongest this year" is because the heavy rainfall process is mainly influenced by the subtropical high weakened after Typhoon Du landed, the northern low pressure system and the warm and humid air flow in the south, especially the strong southerly air flow of the subtropical high continuously transports water vapor to Huanghuai area in North China, bringing a large range of heavy precipitation to this area, which is a regional heavy rainfall process.

At the same time, the formation of a high-pressure dam in the northern part of North China slows down the northward speed of the low-pressure system and has a long detention time in North China, which is also one of the reasons for extreme precipitation.

As for why the rainfall in Fangshan and Mentougou is so large, the reporter learned that this is mainly due to the increase of terrain, which leads to the concentration of precipitation along the mountain, that is, the area with the largest rainfall along Taihang Mountain. The rainfall process reached the magnitude of rainstorm, from eastern Xingtai and Shijiazhuang to Baoding, and finally to Fangshan and Mentougou in southwest Beijing.

When the low-altitude wind direction is dominated by southeast wind, the southeast wind rises under the influence of the western mountainous terrain, which plays a great role in the increase of precipitation, which is also a main reason for the high rainfall in southwest Beijing.