Why is it raining in the rainbow but sunny in the evening?

Rainbow rain, rainbow sunny at dusk reasons:

1, "Rain Towards the Rainbow": The appearance of dawn indicates that the water vapor and water droplets in the atmosphere have increased, and clouds have invaded the local area from the western sky, which can predict that it will turn rainy in the future.

2. "Late rainbow and sunny": The appearance of sunset glow indicates that the rain in the west has stopped and the weather has turned fine. Moreover, the bright red and golden red sunset often indicates that the atmospheric stability has improved, which can predict the future weather will turn fine.

The formation of chardonnay:

In the early morning and evening, around sunrise and sunset, rosy clouds often appear on the horizon. This is because around sunrise and sunset, sunlight passes through the thick atmosphere and is scattered by a large number of air molecules.

When sunlight enters the atmosphere, it will scatter when it meets atmospheric molecules and particles suspended in the atmosphere. These atmospheric molecules and particles themselves do not emit light, but because they scatter sunlight, each atmospheric molecule forms a scattered light source.

According to Rayleigh scattering law, light with shorter wavelength such as violet, blue and cyan in the solar spectrum is most easily scattered, while light with longer wavelength such as red, orange and yellow has stronger light transmission ability.

So the clear sky is always blue, and the light above the horizon is only yellow, orange and red with longer wavelengths. After these rays are scattered by impurities such as air molecules and water vapor, the sky there will be colorful.

Extended data:

For thousands of years, the working people in our country have summed up the rich experience of "knowing the sky by observing the clouds" according to the changes in the shape, direction, moving speed, thickness and color of clouds in production practice, and compiled these experiences into proverbs.

1, the morning glow never dies, and the sunset glow travels thousands of miles:

There are no clouds in the east and clouds in the west in the morning. Sunlight shines on the clouds and scatters rosy clouds, indicating that there is a lot of water vapor in the air or a rainfall system moves in. During the day, the air is generally unstable and the weather will turn rainy. If there is a sunset glow in the evening, it means that the sky in the west has cleared up, and the general convection is weakened at night. The clouds in the east that form the rosy clouds will move eastward or tend to dissipate, saying that it will be fine tomorrow.

2, cotton cloud, rain is coming:

Cotton clouds refer to flocculent cumulus clouds. The appearance of this cloud shows that the middle atmosphere is very unstable. If there is enough water vapor in the air and there is upward movement, cumulonimbus clouds will form and there will be thunderstorms.

3, northwest day unlock, Ming Sun:

It refers to a rainy day, and the clouds in the northwest direction split to reveal a blue sky, which is called "opening the sky". This shows that the local area is already at the back of the rainy weather system. As the rainfall system moves eastward, the local rainfall will stop and the weather will improve.

4, sunset shot foot, rain falls within three days:

It means that the sun shines through the cracks in the clouds, which is called "sun foot". The foot of the sun appears in the evening, indicating strong convection and rain.

Baidu encyclopedia-Xia

Baidu Encyclopedia-See the Cloud and Know the Weather