What is a subtropical high? What are the negative effects of subtropical high?

The full name of subtropical high is "subtropical high area". It can adjust the water vapor in the northern hemisphere in summer and the temperate climate in the southern hemisphere in summer. But its disadvantages are as follows: 1 Long-term high temperature and extreme heat (when the subtropical high is strong and stable), 2. The strong convection and abundant water vapor at the edge of subtropical high are easy to bring extreme strong convection weather. Supplement: In the core area under the long-term control of subtropical high, the air is easy to dry under long-term high temperature, which will cause drought.