秋空  The wind brings the autumn chill.

すっかり秋。朝のひんやりした空気、澄んだ高く青い空に筋雲(巻雲)。

9月になりました。
夏から秋にかけて穏やかな風と気温の低下によって空の透明度が増すこと、水蒸気量が少なく上昇気流が弱くなるということで、巻雲、巻積雲、高積雲などの雲が多く見られるようになるそうです。

一番上層に位置する巻雲は上空5~13キロ付近に現れる雲のようで、この上には、雲は存在しないようです。なんだか秋は空が広く見えるのはそのせいなのでしょうか。

Ready autumn. In chilly air of the morning, the clear blue sky, highly a cirrus.The cirrus isn’t located in the upper air. That is an appearing cloud to sky around 5-13 kilos.Clouds such as a cirrus, a cirrocumulus, the altocumulus seem to come to be frequent. The sky are increasing transparency air by calm wind and a drop of the temperature and steam quantity from the summer to the autumn. And an ascending current of air becomes weak, too. I think that that’s why we can see high and wide sky in autumn. 

Anyway, Please spend good autumn time and beautiful sky! 🙂

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