Mysterious Rain - Kaiu

Japanese: 怪雨 - かいう
Mysterious Rain - Kaiu

Rain that is colored or mixed with foreign matter. Rain mixed with soil and sand is called muddy rain. In Japan, yellow sand is often the cause, and leaves gray or yellowish brown marks on tree leaves after the rain. When soot or substances blown into the air by fires or explosions dissolve in the rainwater, the rain turns black. This is called black rain. During the pine flowering season, yellow pollen carried by the wind falls mixed with the rain and sometimes floats in puddles, and is also called sulfur rain. When foreign matter falls alone, it can also be called mysterious rain. Although it is a rare phenomenon, there are quite a few records of small animals such as fish, frogs, and ants, as well as nuts, grains, and dead grass falling. In one example of fish rain, a large number of live fish about 10 centimeters deep fell from a black cloud in New York on the afternoon of May 15, 1900. In such cases, most of the rain is likely to have been sucked up by a tornado. This type of strange rain often accompanies sudden phenomena such as thunderstorms or heavy rain.

[Takeji Shinohara]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

色がついたり、異物が混じった雨。土砂が混じっている雨は泥雨(でいう)とよばれる。日本付近では、黄砂が原因のことが多く、雨後の樹葉などに灰色、黄褐色などの跡が残る。煤煙(ばいえん)あるいは火災、爆発で空中に舞い上がったものが雨水に溶けると黒い色の雨になる。これを墨雨(ぼくう)という。松の開花期には、風で運ばれた黄色の花粉が雨に混じって降り、水たまりなどに浮くことがあって、硫黄の雨(いおうのあめ)ともいわれる。異物が単独で降る場合も怪雨とよばれることがある。まれな現象であるが、魚やカエル、アリなどの小動物、あるいは木の実や穀物、枯れ草などが降った記録が少なからず残っている。魚雨の例では、ニューヨークで1900年5月15日の午後、黒雲から10センチメートル内外の生きた魚が多数降った。このような場合、その多くは竜巻で吸い上げられたものであろう。この種の怪雨は、雷雨や強雨など急激な現象に伴うことが多い。

[篠原武次]

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