What is the symbol of cloudy weather?

In the weather forecast, "cloudy" weather is strictly defined, which refers to a kind of weather that can be called "between sunny and cloudy". In the weather forecast, cloudy means that there are more clouds in the sky and there is not enough sunshine, but the sky can still be seen through the cracks in the clouds. The total cloud cover accounts for 5/ 10-7/ 10 of the sky area.

Extended data

The definition criteria of "sunny", "partly cloudy", "cloudy" and "cloudy" are simple. In the meteorological industry standard, the percentage of cloud area in the sky is taken as the criterion: it is sunny when the cloud amount is 0% to 10%; 10% to 30% partly cloudy; 30% to 70% is cloudy; More than 70% is cloudy.

Sunny days are not absolutely "cloudless in Wan Li". Partial cloudy is an essential item in observation, but it is not commonly used in forecast because it is close to sunny day.

Visually, when it is sunny or partially cloudy, the blue sky is like washing, and there is no cloud or only a small amount of cumulus in Wan Li; Clouds cover most of the sky on cloudy days, mostly cumulus clouds or layered clouds with a small range, through which sunlight can shine on the ground; On cloudy days, a large range of layered clouds cover the sky, which has a great influence on the light transmittance, and generally the sun is not visible.

Because of the low temperature of high clouds, they are mostly composed of ice crystals, which are very bright; Low clouds are mostly composed of water droplets, which are slightly gloomy. Therefore, when it is cloudy, white clouds are generally floating in the blue sky; On cloudy days, there will be a sense of depression that "dark clouds are pressing the city to destroy".