What does the agricultural proverb "rainy mountain wears a hat, rainy mountain has no waist" mean? Is there a scientific explanation?

Meaning: Clouds appear on the top of the mountain and it will rain, but clouds appear on the mountainside and it doesn't rain.

Scientific explanation: When rainy days come, because the clouds are dark and low, they often press down the hills and form a "hat on the mountain", so it is a precursor to rainy days. Low clouds formed by radiation cooling at night, such as local stratigraphic clouds, are mostly in the middle of the mountain, which is probably fog, so the mountainside is generally a symbol of good weather.

Extended data:

Similar to the agricultural proverb "A rainy mountain wears a hat, but a rainy mountain has no waist":

1, the east wind is urgent, prepare the hat. The wind in Yun Qi is very urgent, and the more urgent it is, the heavier the rain will be.

These words mean: it doesn't necessarily rain from the east wind, but it will be terrible if the east wind is strong. Since the east wind is very small, then. This air flow must come from a very close place, perhaps a local air flow, and all its attributes must be consistent with the local environment.

So it is rare for the weather to get worse. However, if the east wind is strong, it means that the east wind in front of the cyclone is an air flow from a distance, and there will be a discontinuous front moving locally, so the weather will change.

2, the northeast wind, the rain is too public.

The northeast wind is an air flow that originates from the northern ocean surface, or from the northern ocean surface and passes through a long-distance ocean surface, and naturally contains less water vapor than the southeast wind; However, because it is a cold air flow, its lower part touches the relatively hot ocean surface or land surface in the south, making its upper part cold and its lower part warm, resulting in convection. As a result, the water vapor on the ground was brought to the sky and had sex.

3. In spring, the east wind and the rain are gurgling.

The east wind blowing in spring is a precursor to bad weather. This is because, on the one hand, the ground warms strongly in spring; On the other hand, the warm air is gradually active, the continental pressure is gradually decreasing, and the anticyclone moves eastward into the sea. There will be easterly winds at the tail of the anticyclone, and these easterly winds will flow to warmer land, causing the phenomenon of heating up and cooling down. At this time, the air layer is unstable and prone to upward convection, so it is very likely to produce precipitation.