Three characteristics of cold wave
large cooling range: the cooling range of cold wave is closely related to the intensity of cold air. When the cold air goes south, the stronger its intensity, the greater the cooling rate. This is because the density of cold air is high, which increases the pressure on the surface air, resulting in a rapid temperature drop. This drastic cooling will cause freezing damage to crops and affect industrial and agricultural production.
Strong wind: Cold wave is the activity of strong cold air. When strong cold air moves south, it will produce obvious pressure gradient with warm and humid air in the south. This pressure gradient will produce a strong pressure gradient force, which will drive the formation of strong winds. Strong winds will damage buildings and facilities and affect people's normal life.
rain and snow weather: the cold wave is often accompanied by rain and snow weather, which is mainly due to the interaction between warm and humid airflow and large-scale strong cold air activities. When the strong cold air goes south, it will meet the warm and humid air in the south, forming the intersection zone of cold and warm air. At this intersection, warm and humid air will rise rapidly and condense into clouds, which will produce precipitation. Because of the intensity of cold air, this kind of precipitation often appears in the form of rain or snow. These rainy and snowy weather will adversely affect traffic and communication, and affect people's travel and daily life.