On the last day of the dog days, Shanghai was hit by a downpour. Some netizens described that the rain that fell in Shanghai today (20th) was "like pouring out of a basin", which caught many office workers off guard. According to a survey by the Shanghai Meteorological Service Center, nearly 60% of the netizens surveyed said that they were obviously affected by heavy rainfall on their way to work today.
Rainfall statistics from the Shanghai Central Meteorological Observatory show that from 20:00 yesterday (19th) to 16:00 today, there was widespread heavy rain across the city, and heavy rains occurred in Chongming, Baoshan, Jiading, Jinshan, Fengxian and other suburbs, with local heavy rainstorms. At around 15:31 today, the temperature in the central city (Xujiahui Station) was lowered by the rain to 26.3°C, and the highest temperature in the whole day was only 27.4°C. It can be said that it is the coolest day after plum blossom.
In the past two days, there has been extensive rainfall in southern my country, but the causes are slightly different. Here I have to mention the first typhoon "Terry" that just landed in our country. Although the weakening "Terry" was stopped by the Central Meteorological Observatory as early as the 18th, the influence of its residual cloud system still exists. The rain in Guangxi, Guizhou, and eastern Yunnan is the impact of typhoon "Tali" low-pressure circulation.
The rainfall in the Yangtze River Delta region is mainly caused by convection at the edge of the subtropical high. Today, Jiangsu, Zhejiang and Shanghai are active, and they have reached the national hour rain list in many places. The competition is competitive -
today at 11 o'clock today, Jiading appeared in the country with 48.6 millimeters of rainfall. Jiangsu Qidong ran behind with 30.8 millimeters. At 12 o'clock, Chongming refreshed the list in the country with 65.6 mm hours, becoming the first in the country. ; With the gradual development of Zhejiang, by 14 pm, Zhejiang Pingyang, Beilun, Hongjia and Ninghai rushed into the top four in the country.
Where does so much rain come from? In fact, the impact of weather is interlocking. Meteorological experts from the Shanghai Meteorological Bureau said that the rain in Shanghai was mainly due to the abundant water vapor brought by the southwest jet stream at the edge of the subtropical high pressure, but it was also mixed with the indirect impact of the typhoon. Typhoon "Tali" contributed to the water vapor. The
forecast shows that there will still be showers or thunderstorms in Shanghai from tonight to tomorrow. Although the time and scope of the rain is not as good as today's daytime, the rainfall in some areas can still reach torrential rain, and the short-term wind force is also strong during thunderstorms. The temperature will rise tomorrow, and it will be comfortable in the morning, with a minimum temperature of 26°C and a maximum temperature of 32°C during the day.
Coolness in summer is short-lived, hotness is the norm. Starting on Saturday, Shanghai was under the control of the subtropical high pressure, and the high temperature returned, with the daily maximum temperature near the 35°C high temperature line. At that time, there will still be frequent showers in Shanghai. The reason is that the temperature is high, the energy in the atmosphere is sufficient, the convective clouds are active, and there will be short-term hot thunderstorms in some areas in the afternoon.
Starting tomorrow, Shanghai will enter the middle of the dog days. This year is the extended version of the dog days, which lasts for 40 days. The biggest difference between it and the normal version is the length of the dog days. The extended version has 20 days of dog days, which is 10 days more than the normal version.
From a national perspective, the dog days are the hottest time of the year. According to the meteorological data of more than 2,000 meteorological stations in my country, the "dog days" are the hottest in most parts of our country.
Specific to a certain city and a certain year, the "lengthening" of the dog days may not necessarily make it hotter. Meteorological experts explained that the length of "three volts" is not directly related to the number of high temperature days. Although "three volts" is the hottest, whether high-temperature days occur is closely related to the atmospheric circulation, the location, intensity and control time of the subtropical high. In addition, the number, intensity, and path of typhoons each year are also important factors that affect the cool and hot weather in many areas of our country. If the coastal areas are continuously hit or affected by strong typhoons during the dog days, then this area is very likely to have a cool summer year.
