What does it mean to return to Nantian, Guangdong?

Huinantian, Guangdong: Huinantian (abbreviated as Huinantian) is a weather phenomenon in southern China, which usually refers to the phenomenon that the temperature starts to get warmer and the humidity starts to rise every spring.

1. Introduction:

Returning to Nantian is a phenomenon of warmer weather, which generally appears in February and March in spring. The main reason is that after the cold air leaves, the warm and humid airflow quickly counterattacks, resulting in an increase in temperature and air humidity. Some cold objects are easy to produce water droplets when they encounter warm and humid airflow.

The tropic of cancer in the south is more serious, which is related to the sea and humid air in the south. When Return to the South Sky appeared, the air humidity was close to saturation, and the walls and even the ground would "bubble". Everywhere is wet, and the air seems to be able to wring water out. Dense fog is the most distinctive appearance of "returning to the south sky"

2. Generation principle:

From the meteorological point of view, after a long period of low temperature, the surface of the object is completely cold. When the temperature of the object is less than or equal to the dew point temperature, the water vapor in the air reaches saturation and begins to condense on the surface of the object, producing water droplets and returning to the south.

The so-called dew point temperature refers to the temperature when the air temperature drops to saturation under the condition that the water vapor content and air pressure in the air remain unchanged. The main reason is that after the cold air passes, the warm and humid airflow quickly counterattacks, resulting in an increase in temperature and air humidity. Some cold objects are easy to produce water droplets when they encounter warm and humid airflow.

3. Preventive measures:

When the damp "returning to the south sky" strikes, everyone must remember to close the windows at home, especially those facing south and southeast, so as not to give any chance for the moisture eyeing outside the window to sneak in.

The most important period of moistureproof is in the morning and evening of every day. The air humidity in these two periods is higher than that at noon. If the doors and windows are not closed in time, water vapor will seriously penetrate into every corner of the house. In addition, if you think that the indoor air cannot circulate because the doors and windows are closed, I suggest you open the window for a short time at noon.