Meteorological knowledge station: Why is Huinantian called Huinantian?

I believe that most southern friends are familiar with the annoying weather phenomenon of Huinantian, but for northerners who have never seen the power of Huinantian, they are not very familiar with Huinantian. First of all, the name makes people curious. Why is it called Huinantian? Today's 24 solar terms will be introduced to you.

Why is Huinantian called Huinantian?

There is a saying that the name of Huinantian comes from the name of Cantonese. South return is a unique weather phenomenon in Guangdong, which usually refers to a wind direction change phenomenon caused by typhoon in summer due to Guangdong's special terrain and other factors, that is, the meaning of typhoon returning south.

If the summer typhoon generated near the South China Sea moves from south to north, the early stage of typhoon attack (before and after landing) is usually north wind, northeast wind or northwest wind. After landing, typhoons usually turn to south wind, southeast wind or southwest wind. When the north wind, northeast wind or northwest wind gradually turns to south wind, southeast wind or southwest wind, it is considered that the typhoon is over half, and the wind and rain in the north will gradually weaken or even stop completely.

This change of direction means that after the wind returning to Nantai returns to the south, it usually introduces southwest airflow to invade the southwest or cause heavy rain; In addition, if the north and south typhoons do not return to the south, there may be rainy weather for several days in a row. Usually when you go back to the south, it will form very humid weather, and it will not get better until the north wind turns.

Another way of saying it is that the "south" of returning to Nantian means the south wind. The so-called returning to Nantian is the resurgence of the tide. In spring, the south wind blows, and it is very humid indoors and outdoors, and thick water drops are attached to all the floors and walls. Air seems to be wrung dry. There will be heavy fog at this time, and the visibility will be reduced. You need to be careful when traveling. In addition, some items or foods are also susceptible to moisture, leading to mildew and rot. Therefore, appropriate moisture-proof measures should be taken.