What weather system controls spring thunderstorms in southern my country?

Thunderstorms in spring in southern my country are controlled by warm front weather systems. In spring, as the direct sun moves northward, the power of warm air masses strengthens and the power of cold air masses weakens. Warm front weather often forms in southern my country because The warm air mass has more water vapor, so thunderstorms often form.

When a front moves, if the warm air plays a leading role and pushes the front to move to the side of the cold air mass, this kind of front is called a warm front. After the warm front passes, the warm air mass takes over the original position of the cold air mass. Warm fronts mostly move in Northeast China and the middle and lower reaches of the Yangtze River, and are mostly connected with cold fronts. When a warm front passes through, it will be warm and humid, the temperature will rise, the air pressure will drop, and the weather will turn to clouds and rain. Opposite the cold front. Warm fronts move slower than cold fronts and may cause continuous precipitation or fog.