Why is the temperature in Shanghai suddenly so high today? Pray for the great gods.

Xinhua Online Hai July 20th (Reporter Li Rong) "On the 20th, the temperature in Xujiahui reached 40 degrees Celsius from 14: 09 to 14: 08". The measured temperature recorded by the forecaster of Shanghai Central Meteorological Observatory broke the century-old high temperature record in Shanghai with a slight advantage, which is the second highest value in the history of Shanghai meteorological record. The Meteorological Observatory issued the highest-level high-temperature red warning signal for the first time. "It's extremely hot today." In the early morning of the 20th, the reporter heard an old man say this. The sunshine in the morning is very sinister, the outdoor heat wave is rolling, and the exterior wall of the house feels very hot. The room is full of air conditioning, but I still feel a little hot. The Shanghai Central Meteorological Observatory issued the second highest high temperature orange warning at 8: 05 on the 20th. At noon, the temperature in Xujiahui area has risen to 38.9 degrees Celsius. By 14: 00, the high temperature alarm was updated to the highest level of red signal. This is the first time that a red high temperature warning has been issued since the establishment of the disastrous weather warning system in Shanghai. The chief service officer of the Meteorological Observatory said that there was a high temperature of 40 degrees Celsius in Xujiahui from 14: 09 to 14: 08+0 1 on the 20th. Although it was only a short 3 minutes, it "almost broke the 100-year high temperature record in Shanghai". The extreme high temperature in Shanghai's history appeared on July 12 1934, reaching 40.2 degrees Celsius. In addition to Xujiahui, Shanghai Pudong also experienced a high temperature of 40 degrees Celsius on the 20th. Meteorologists said that there were three main reasons for the high temperature weather in Shanghai on the 20 th: the subtropical high strongly controlled Shanghai; On the 20th, there was a southwesterly wind blowing on the ground in Shanghai, which was very beneficial to the formation of high temperature. Since the beginning of summer in Shanghai, there have been 13 days of high temperature, far exceeding the annual average, and the heat accumulation is more, which leads to the peak temperature rise on the 20th. As of 20th 16, the temperature in Shanghai has dropped below 40 degrees Celsius, but the Meteorological Observatory still maintains an orange warning. It is estimated that it will maintain a high temperature above 35 degrees Celsius around 20 o'clock that day, which is very rare. Shanghai 2 1 The highest temperature during the day may still be as high as 37 degrees Celsius, but the subtropical high begins to weaken and recede eastward, and will turn into showers or thunderstorms from afternoon to night. From the 22nd, the hot weather in Shanghai will temporarily come to an end.