How did the bright sky suddenly become dark as night?

Darkness in the daytime is a natural phenomenon similar to that at night, which is due to the strong convective clouds formed by the meeting of cold and wet air currents, resulting in thick and low clouds and the inability of light to penetrate. More common in summer thunderstorm weather. [ 1]

The causes of darkness and extreme night are different in nature and cannot be confused.

Meteorologists explained that the main reason for this dark sun phenomenon is that the cold air thrown by the cold vortex meets the humid southeast airflow in Dalian, forming a strong convective cloud cluster with thick and low clouds, thus producing the dark sun phenomenon. On dark days, the convective clouds above develop very vigorously, and the thickness of the clouds once reached 13 km, which was enough to cover the sky.

When the temperature is too high, high temperature leads to active heating flow, and when cold and warm air meet, there will be strong convective weather. In this weather condition, a "low and thick" cloud was born; This kind of cloud is close to the ground, and its unusual thickness blocks the direct light of the sun and even absorbs the scattered light in the sky. When this "huge" cloud moves over an area, it will bring a "dark day" scene.