Another example is Zhengzhou, which was outstanding in this high temperature process. Yesterday, the highest temperature reached 39.4℃, and it is predicted that the high temperature will continue at 35℃ in the next five days. It is worth noting that Zhengzhou had a high temperature of 35℃ for seven days before June. The first high temperature sunrise was on April 30th, and the highest temperature reached 40.8℃ on May 3rd, making it the earliest record of 40℃ in Zhengzhou since 1961 and a proper barbecue mode.
Daily distribution of monthly average high temperature in Zhengzhou from 2000 to 2019.
Why is the temperature so high in May and June? Part of the reason may be related to global warming, but on the other hand, the temperature in the north is indeed easier to rise in May and June, which is related to the weather system that controls the area.
Usually, the high temperature in the north in May and June is mainly controlled by the continental high pressure ridge. Under the control of the continental high pressure, downward flow prevails and the air is dry, so the atmospheric permeability is very strong, and the solar radiation can easily reach the ground, and the radiation temperature rise is very obvious. Therefore, it is easy to have a high temperature around noon, sometimes even reaching 40℃. At this time, the somatosensory sensation is mainly dry and hot. For example, in Zhengzhou, since 1961, there have been 26 days of high temperature above 40℃, including 18 days in May and June, accounting for nearly 70% of the total days; The high temperature above 42℃ has appeared for 4 days in total, accounting for 3 days in June.
By July, with the subtropical high moving northward, the main influence system of high temperature in north and south is subtropical high. The water vapor in the subtropical high control area is relatively sufficient, the air humidity is high, and the body temperature is high, so people will feel stuffy. At this time, the high temperature in the south began to really exert its strength, and even lasted for more than a month. So this year’s high-temperature drama has just begun. Are you really ready?
(Editor: Su Yujun)