North China's strongest rainfall this year is coming soon! It is expected that starting at night today (20th), a round of heavy rainfall is about to come online. Many places in the north will switch from sunny mode to rainy mode. North China, Huanghuai, Northeast and other places will usher in stronger rainfall. The rainfall in North China may be the strongest this year.
At about 17:00 on July 20, the Beijing Flood Control Office issued a network-wide reminder: From the night of the 20th to the daytime of the 22nd, there will be heavy rain in our city. Citizens are requested to arrange travel safely and stay away from rivers and dangerous mountainous areas. advocates that relevant units in the city adopt staggered commuting and commuting on the 21st to ensure safety.
China Meteorological Administration launched a four-level emergency response
According to the Emergency Office of the China Meteorological Administration, after comprehensive research and emergency consultation, the China Meteorological Administration launched a four-level emergency response to rainstorms at 16:00 on the 20th.
It is expected that from the evening of the 20th to the 22nd, North China and Northeast China will experience strong rainfall from west to east. Among them, northern Shanxi, Hebei, Beijing, Tianjin and eastern Inner Mongolia, Liaoning, Jilin, and central and western Heilongjiang have experienced moderate to heavy rains. There are heavy rains in parts of central Hebei along the mountains, western and southern Beijing, eastern Tianjin, northeastern Inner Mongolia, and central and eastern Liaoning. Central Hebei, southwest Beijing, and eastern Liaoning. heavy rain.
During the rainfall process, some areas were accompanied by strong convective weather such as thunder and lightning, short-term heavy precipitation, and local thunderstorms and strong winds. The main rainfall period in Beijing, Tianjin and Hebei will be on the 21st and gradually end in the afternoon of the 22nd; the main rainfall period in the Northeast will be from the 22nd to the 23rd.
With the rain coming, the hot weather in North China and other places will also temporarily come to an end.
Why is it so rainy?
Meteorologically, "seven downs and eight ups" generally refers to the period from late July to early August every year, when the precipitation in North China and Northeast my country is the most concentrated period, and it also has the scientific name "North China Rainy Season". According to the flood control standard in the rainy season, sometimes the "on-duty" time of "seven downs and eight ups" can also be extended from the second half of mid-July to the second half of mid-August, about one month.
Why does it rain all year in the north at this time?
Every year around the end of July, the summer monsoon advances northward to North China, and at the same time, the Northwest Pacific subtropical high ridge moves north to the area north of 30 degrees north latitude. The subtropical high is like a water vapor "conveyor belt", transporting water vapor from the ocean to the north continuously, providing sufficient water vapor conditions for North China. These warm and humid air flows "love each other" with the cold air moving eastward and southward, bringing heavy precipitation to the northern region.
Of course, the occurrence of heavy rain is also inseparable from the "backing" of the terrain: the Taihang Mountains run north-south across the central part of North China. They are the natural boundary between the Loess Plateau and the North China Plain in the east, and have an important impact on the weather system in North China, especially the heavy rain.
Shanghai and Wuxi have significant precipitation
In fact, according to China Weather Network, as of 18:00 on the 20th, Shanghai Chongming has the most precipitation in 24 hours.
Affected by the shear line cloud system at the edge of the subtropical high, Shanghai has experienced significant precipitation this morning. Rainfall statistics from 6:00 to 12:00 today show that half of Shanghai has reached or exceeded the heavy rainfall level, among which Chongming, Jiading, Jinshan and Fengxian have reached the level of heavy rain, and some stations have reached the level of heavy rain.
Image source: News Square
html On the morning of the 120th, affected by heavy rainfall, some low-lying areas in Jinshan District, Shanghai experienced large areas of waterlogging, some underpasses were knee-deep, and motor vehicle roads were closed.
In addition to Shanghai, the precipitation in Wuxi today also scared many people.
Image source: Wuxi TV station "Wuxi Bobao"
At 8:12 this morning, Wuxi Meteorological Observatory upgraded and issued a red rainstorm warning signal. @吴西风食微博 Weibo stated that this is also the first release in five years.
6:52, Wuxi Meteorological Bureau continued to issue a yellow thunderstorm warning signal;
8:12, Wuxi Meteorological Bureau issued a yellow rainstorm warning signal: It is expected that there will be more than 50 mm of precipitation in some areas of our city from today night to tomorrow, and the hourly rainfall can reach more than 40 mm.
Rainy weather, please pay attention to precautions, pay attention to avoid low-lying water-logged areas when going out, do not risk wading, and do not force through. When the vehicle is turned off, immediately go to a safe area to avoid danger, and stay away from dangerous areas such as enclosures, billboards, trees, and utility poles.
Editing | Lu Xiangyong Gai Yuanyuan
Proofreading| Sun Zhicheng
Daily economic news synthesized from Beijing Daily, CCTV news, Kankan News, Wuxi weather, etc.
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