What kind of weather system caused the Dongting Lake area to be rainy and closed for several months? Why?

Warm fronts are mostly active in northeast China and the middle and lower reaches of the Yangtze River, and are often accompanied by cold fronts.

When the warm front crosses the border, it is warm and humid, the temperature rises, the pressure drops, and the weather turns cloudy and rainy. Not a cold front. The warm front moves slower than the cold front, which may cause continuous precipitation or fog.

It's raining cats and dogs, even the moon doesn't open, that is, it's raining continuously (precipitation is concentrated in front of the front)

In Dongting Lake area, the cold front is often in the middle and lower reaches of the Yangtze River-mostly drizzling.

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