What weather does the arrival of high pressure portend?

There is no front in the high pressure area. Because of the divergence of airflow, the upper air sinks and supplements. In the process of sinking, the temperature rises and the relative humidity drops, resulting in cloudy, rainy and windy weather.

According to its thermal structure, high pressure can be divided into two types:

The most common is cold high pressure, which is caused by surface cooling. After the surface temperature drops, the air temperature near the surface also drops, and the cold air lacks heat energy, so it is difficult to rise. It is heavier and denser air, and the surrounding air is warmer and lighter, so the air flow changes from cold air to the surrounding direction, forming a cold high-pressure center. For example, the high pressure in Antarctica and Siberia.

The subtropical high is caused by the strong updraft at the equator, which forms the upper air pressure and flows in the direction of low pressure from south to north. Because of the geostrophic bias, these air flows from the equator gradually turn from west to east, no longer move along the meridian direction, and accumulate and sink near 30 degrees north and south latitude, forming a high pressure and being relatively hot.