Weather under the influence of cold fronts and warm fronts

A cold front is the front of cold air. At the junction of cold and warm air masses, cold air pushes towards warm air. There are strong winds and rains above the cold front, and strong winds and cooling weather behind the front. On the contrary, it is a warm front, there are cloudy and rainy weather above the front, and it becomes cloudy and sunny behind the front, and the temperature rises. On the undulating high-altitude westerly airflow, the wave trough corresponds to the low-pressure trough. The warm and humid air in front of the trough is active, causing rainy and snowy weather, while the cold air behind the trough controls the windy and cooling weather. The wave crest corresponds to the high-pressure ridge, and the sky is clear.