What are the characteristics of airflow and weather in saddle pressure area?

There are a compression axis and a tension axis: along the compression axis, the airflow converges to the center of the saddle-shaped air pressure region; Along the tensile axis, the airflow diverges from the center of the saddle-shaped air pressure region to both sides. When the angle between the front strike and the tensile axis is less than 45 degrees, it is beneficial to frontogenesis, and if there is enough water vapor in the warm air mass climbing along the front, it is easy to cause precipitation; When the angle between the front strike and the tensile axis is greater than 45 degrees, it is beneficial to the front elimination. Generally, the wind speed in the saddle-shaped air pressure area is relatively small. When the atmospheric stratification is stable and there is a warm and humid air flow from the ground to the saddle-shaped air pressure area, the water vapor near the ground condenses at night due to the radiation cooling of the ground, which is easy to form radiation fog.