Expert answering Shanghai's recent extreme high temperature weather cause

Xinhua News Agency, Shanghai, August 17 (Reporter Dong Xue Liu Ying) If you use a word to describe the summer of Shanghai this year, it is "hot".

According to data from the Shanghai Center Meteorological Channel, Shanghai appeared on July 10 this year's first 40 degrees Celsius and high temperature, refreshing the earliest record of 40 degrees Celsius high temperature; the highest temperature on July 13th was 40.9 degrees Celsius, and the high temperature historical pole value was tied. There are 6 days above the high temperature days, and the number of days is the most record ... This year, Shanghai refreshed a number of high -temperature data, setting a record since Shanghai has a meteorological record.

Why does it appear in Shanghai for high temperature? How long will this happen? Why are you often "multi -alarm" such as high temperature, wind, lightning, heavy rain, hail, etc.? Why do some mobile phone software push the weather forecast different from the meteorological department? The reporter interviewed Tian Hongjun, the chief forecast at the Shanghai Central Meteorological Observatory, and asked him to answer these questions one by one.

The subtropical high pressure "covers" the Sichuan Basin to the middle and lower reaches of the Yangtze River

"This year's continuous high temperature is related to the abnormality of the atmospheric circulation." Tian Hongjun said that this year's subtropical high pressure is extremely strong, there is no strong cold air on the north side of the deputy high, and there is no tropical cyclone on the south side of the vice high. Hometown controlled by the subtropical high -voltage.

Under the control of stable subtropical high -pressure control, the sinking air flow below the atmosphere, the sunny sky, the sun is very good, and the ground temperature is rapid. This strong and stable subtropical high pressure is an important reason for continuous high temperature this year. Specifically, the subtropical high pressure is like a solid "high temperature fortress". The weaker cold air will also "detour", which is difficult to achieve the cooling effect.

At the same time, it is one of the reasons why the auxiliary tropical high pressure comes from the high pressure of the afternoon. Due to the rapid temperature of the surface, the energy in the air continued to accumulate, and the air ball was lifted to a certain height. Shanghai has rich conditions for rivers and lakes and lakes. In addition to providing rich water vapor for the atmosphere, the rapid rise in land and the temperature difference between sea and land has increased significantly. Flowing weather.

The reporter noticed that this summer, Shanghai issued many hail warnings many times. "If the development of the Liuyun Group is very strong, height, or the invasion of dry cold air in the middle layer, hail will form." Tian Hongjun said.

In addition, the water group is very strong and highly height, and it is easy to have a strong wind. Tian Hongjun explained that this short -term heavy precipitation often forms a strong sinking air.

It is predicted that the high temperature in the next week will continue

According to Tian Hongjun, the subtropical high pressure in the next week will not have significant signs of recession, and high temperature weather will still be maintained. Starting on August 24, due to the eastward shift of the western wind groove, the deputy height will fall slightly in the south.

According to the latest data, compared with the temperature above 37 degrees Celsius a day before, Shanghai was reduced by thunderstorms on the 17th. The maximum temperature was 34 degrees Celsius to 35 degrees Celsius, but this was only temporary. The temperature will rise again on the 18th, and the extreme maximum temperature from the 19th to 20th can still reach about 40 degrees Celsius.

In the face of continuous high temperature, water supply and power supply are critical. Taking water supply as an example, Shanghai daily water supply has risen rapidly. The reporter learned from the Shanghai Water Affairs Bureau that on August 15, the daily daily water supply in Shanghai reached 8.97 million cubic meters, a record high this year. The average daily water supply in the city from June to August increased by 0.87%from the same period last year. However, compared to the city's water supply capacity of 12.21 million cubic meters per day, the water consumption of summer peaks in Shanghai is still fully guaranteed.

It is recommended to pay attention to the official data released by the meteorological department

A few days ago, the weather forecast pushed by some mobile phone software was different from the information released by the meteorological department, and some temperatures were too high, causing attention.

"Meteorological data has strict observation specifications. It is a global unified data standard formulated by the World Meteorological Organization. It is not possible to obtain at will. It is recommended that everyone pay attention to the official data released by the Meteorological Department." Tian Hongjun said that some mobile phone software pushed information information It is not from the meteorological department, not authoritative and scientific.

Xujiahui Station is a century -old meteorological observation station. The meteorological data measured here represents the situation in Shanghai. The reporter saw at Xujiahui Station that a device with data measurement temperature, humidity, wind, wind speed and other data was placed in a lawn, and the data that was automatically measured in real time was summarized into the meteorological system in real time.

In addition, Tian Hongjun answered the different observation temperature and somatosensory temperature. The body sensation temperature was not only related to the actual temperature observed, but also closely related to wind and air humidity. When the temperature is the same, the greater the humidity, the higher the body temperature.

【Edit: Jiang Yuwei】

- END -