On a sunny day, it rained heavily in two or three minutes. What do you mean? What is this sign?

Natural phenomena. . . . It is due to the collision of two high-altitude debris with different charges under the action of the solar wind, which leads to the excessive water vapor content in the air in some areas and the rapid evaporation of water vapor due to solar radiation. The rain from the sky had disappeared before it landed, so the weather looked fine, but it began to rain.