The common weather phenomena after the warm front and cold front cross the border are

When the warm front crosses the border, it is warm and humid, the temperature rises and the air pressure drops, and the weather turns cloudy and rainy.

When the cold front crosses the border, it will be accompanied by the increase of northerly wind, the increase of air pressure and the decrease of temperature, sometimes causing rain, snow and even heavy rain in summer. Generally, after the cold front crosses the border, the local area will be controlled by cold high pressure, and the weather will become sunny.