Why does it only rain on certain days and not others? Detailed answer

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Why does it only rain on certain days and not others? Detailed answer

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Why does it only rain on certain days and not others?

When we look at the sky and see big heavy clouds there, we probably think that it will rain soon. And we tend to think that clouds are the only thing needed for it to rain. But in reality, rain is the result of a long and complex process. For it to rain, the mutual influence of the Sun, the Earth and the atmosphere is necessary. The process begins when the Earth is warmed by the Sun. This causes the water in the oceans, lakes and rivers to turn into water vapour. Water vapor mixes with air. This process is called vaporization.

Rising warm air brings water vapor into the atmosphere. Here it spreads and cools down. The warm air then gives up some of its cargo of invisible water vapor, and clouds form. This process is called condensation. Inside the cloud, the tiny droplets gradually get bigger and bigger as they collect more and more moisture.

Finally, the drops become so large that they can no longer be held aloft by the air currents, and fall to the ground in the form of rain. Now let's see why the process of rain formation occurs only at certain times.

The first stage of this process - vaporization - occurs almost constantly throughout the day. Water vapor rises into the atmosphere. But this invisible vapor does not turn into visible clouds of tiny droplets every day. This is because the vapor needs a surface on which to condense. If there are no or very few dust particles in the air, condensation cannot occur.

Small crystals of ice and snow also contribute to the formation of droplets. Usually, in order for it to rain, it is necessary for the movement of warm air masses towards cold ones or vice versa. Warm air masses contain clouds and moisture, and when these warm masses are cooled by cold masses, water droplets form and fall as rain. Therefore, weather forecasts always mention the movement of air masses. They tell us whether it will rain or not.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why did St. Isaac's Cathedral almost not suffer in the war?

During the years of the Great Patriotic War, St. Isaac's Cathedral was never subjected to direct shelling - only once a shell hit the western corner of the cathedral. According to the assumptions of the military, the reason is that the Germans used the highest dome of the city as a reference point for shooting. It is not known whether the city leadership was guided by this assumption when they decided to hide valuables from other museums in the basement of the cathedral, which they did not manage to take out before the blockade began. But as a result, both the building and the values were safely preserved.

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