What is a burning cloud?

Flame cloud is a red cloud at sunrise or sunset, which is one of the phenomena of atmospheric change. Most of them appear in June, July and August in summer and midsummer.

It often appears in summer, especially at sunset after a thunderstorm. It is located in the west of the sky and is usually red. Due to the strong evaporation on the ground and the great action of updraft in the atmosphere, the shape of fire clouds is ever-changing.

Glow clouds are formed because sunlight passes through the thick atmosphere and is scattered by a large number of air molecules. Sunlight is a mixture of seven colors of light. Dust and water droplets floating in the air can scatter sunlight and disperse all colors of light.

In the evening, the oblique sunlight passes through the air layer for a long distance, and is scattered more severely, among which purple light is weakened the most, and red light and orange light are weakened the least. These weakened colored sunlight, mainly red and orange light, shines on the sky and clouds, forming bright and dazzling rosy clouds.

Extended data

Burning clouds can predict the weather, and the folk proverb "you can't leave early, but you can travel thousands of miles late"; In other words, if there are fire clouds or fire days in the morning, the weather may get worse; Appear at night, the next day must be sunny, and the judgment result is applicable to most cases.

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.

Baidu Encyclopedia-Huoshaoyun (natural phenomenon)