What causes more thunder and less rain?

From a scientific point of view, "more thunder and less rain" is not in line with the weather facts.

Because, in the process of all kinds of rainy weather, the raindrops of thunderstorm are not only not small, but also the biggest. The reason is that rain drops condense in the updraft in the clouds. Therefore, only in a strong updraft cloud can heavy raindrops fall. An article in the June issue of Science Illustrated said that a meteorologist observed heavy raindrops with a diameter of 1 cm in Marshall Islands and Brazil in 2004, which was recorded in the Guinness Book of World Records. Brazil and Marshall Islands are tropical regions, where rain basically comes from lightning, thunder and cumulonimbus clouds. Cumulonimbus is the cloud with the strongest updraft in nature (therefore, it is forbidden to enter cumulonimbus to avoid being thrown up and crashed; Even in cumulonimbus clouds, hail is often produced much larger than the heavy rain point. On the contrary, the smallest raindrop in the world, Mao Mao rain, occurs in the clouds with the weakest updraft (such as warm front clouds), where even the smallest raindrop can't be suppressed.

Originally, it was natural for the ancients to choose thunder to express their great momentum. Because nothing is more powerful than "thunder" and "thunder" But if it is used to express the meaning of "loud but small action", the number and direction of thunder and raindrops will naturally be opposite: "loud thunder" and "small raindrops"

Of course, idioms belong to the category of literature, so there is no need to stick to facts completely. Moreover, although the raindrops in thunderstorms are not small, they are "not many". And "light rain" and "light rain" are consistent in the direction of quantity.

Thunderstorm weather has three main characteristics: in addition to lightning showers, there are thunderstorms and strong winds. As we all know, lightning can travel far (there is a proverb called "more thunder than rain"); Thunderstorm and gale are shock waves that are sent around because the air pressure is much higher than the surrounding area when the cold air (high density) sinking behind the cumulonimbus cloud accumulates rapidly on the ground, and can also spread to far places. However, thunderstorms are different. Although its scope is basically the same as that of the sinking cold airflow, it will not expand, and the rain area is also a narrow belt formed with the advancement of cumulonimbus clouds (relative to the gale lightning area). That is to say, in the areas affected by thunderstorm weather, there are only thunder and strong winds and no raindrops in most areas (for example, on June 24 this year 17, there were thunderstorms in the third and fourth ring roads in the north of the city, while there were few thunder and heavy rains in the southern cities, or even no raindrops at all). The proverb "Lei Gong sings first, but it doesn't rain much" means "more thunder and less rain". However, after all, "light rain" and "light rain" are not the same thing, and idioms must have another source.