How do you know whether it will rain or snow the next day?

Some basic methods to judge whether it is going to rain-fluffy cumulus clouds can be said to be good weather if they are very scattered, but if the clouds expand or have new development, it means there will be sudden heavy rain. Cirrus clouds and cirrocumulus are very high, where there is little water, so it usually doesn't bring rain and snow. Cirrostratus is advancing slowly, and the weather will turn cloudy. There are high clouds, and it often rains or snows within a few hours. As soon as nimbostratus was formed, continuous rain and snow came. Cumulonimbus clouds are getting higher and higher, the cloud bottom is getting darker and Yunfeng is getting blurred. Soon, the whole Yunshan collapsed and dark clouds filled the sky. In an instant, thunder rumbles, lightning flashes and thunders, which will bring heavy rain immediately, and sometimes hail or tornado. The huge high-level clouds behind cirrostratus and nimbostratus are a sign of heavy rain. So there is a view that "the sun is dizzy and it rains at night, and the moon is dizzy and the wind blows at noon". Sunrises and full moons mostly occur at the edge of cumulus clouds. The weather tends to be fine from small to large. The weather may turn from small to heavy rain. People often say: "The east rainbow thunders and the west rainbow rains." It means that when the rainbow is in the east, it will thunder and not rain. The rainbow is in the west, and there will be heavy rain ...