What is the border line between “clear” weather and “cloudy” weather?
How many types of clouds are there?
Clouds are classified into 10 types. It is the international classification.
1). Cirrus -- These are thin, white clouds shaped like wispy threads.
2). Cirrocumulus -- These are very small, white spotty clouds called “urokogumo,” “madaragumo” “mackerel clouds” and other nicknames in Japan because of their shapes like little spots or fish.
They gather very high up in the sky like rows of little stones.
3). Cirrostratus -- These are high-altitude, thin clouds shaped like sheets, as though cirrus clouds had melted into one another.
(They are usually very high up in the sky, about 5 to 13 kilometers or higher. Their temperature is usually about -25 degrees C or lower.)
4). Altostratus -- These are thin, blue-gray clouds shaped like sheets or layers. Their nickname in Japanese is “oborogumo” or “misty clouds.” They look like thick cirrostratus clouds.
5). Altocumulus -- Nicknamed “sheep clouds” in Japan, the sides of these white and gray clouds are usually rounded, wavy, or fluffy.
6). Nimbostratus -- Nicknamed “snow clouds” in Japan, these dark, gray clouds are usually midway up in the sky, although they often spread higher and lower.
(They are usually 2-7 kilometers up in the sky, and their temperature is usually about 0 to -25 degrees C.)
7). Stratocumulus -- Nicknamed “ridge clouds” in Japan, these clouds look like altocumulus, but they are softer and grayer. The sides of these clouds stick to each other to make the clouds look like waves.
8). Stratocumulus -- Nicknamed “ridge clouds” in Japan, these clouds look like altocumulus, but they are softer and grayer. The sides of these clouds stick to each other to make the clouds look like waves.
9). Cumulus -- These dense, white fluffy flat-based clouds are nicknamed “cotton clouds” in Japan.
10). Cumulonimbus -- These storm clouds are nicknamed “monster clouds” or “thunderclouds” in Japan, these are high, very thick clouds that rise straight up like a tower or big monument. Their top is thin strands like appearance.
(At the top of the clouds, the temperature is as low as - 50 degrees C.)
Why does it rain sometimes even when the sky is clear?
What is the difference between high-pressure air and low-pressure air?
“Air pressure” refers to the weight of the air high up in the sky. If the air pressure in one area is higher than the other area around it, we say the air pressure is high. If it is lower we say the air pressure is low.
Is there any year without typhoon’s attack?
In both 1984 and 1986, the same number of typhoons is observed like in other years. But none of them came to Japan. In 2000, the number of typhoon occurrences is fewer than usual and no typhoons came to Japan.
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