But if you notice that Cirrus begins to cover more of the sky, and gets lower and thicker, this is a good indication that a warm front is approaching. In a warm front, a warm and a cold air mass meet. The lighter warm air is forced to rise over the cold air mass, leading to cloud formation.
但如果你注意到卷云开始覆盖天空的大部分,位置变低,云块变厚,这预示着暖锋正在靠近。暖锋就是暖空气团和冷空气团相遇。重量更轻的暖空气团被迫升到冷空气团上方,导致卷云的形成。
The lowering clouds indicate that the front is drawing near, giving a period of rain in the next 12 hours.
云层变低预示着暖锋临近,在未来12个小时将会下雨。
4. Stratus['stretəs] 层云
Stratus is a low continuous cloud sheet covering the sky. Stratus forms by gently rising air, or by a mild wind bringing moist air over a cold land or sea surface. Stratus cloud is thin, so while conditions may feel gloomy, rain is unlikely, and at most will be a light drizzle.
层云是低低地覆盖天空的连续云层。层云由缓慢上升的空气形成,或是轻风将湿润空气吹过冰冷的地面或海平面形成。层云比较薄,所以尽管天气阴阴的,但却不太可能下雨,最多是毛毛雨。
Stratus is identical to fog, so if you've ever been walking in the mountains on a foggy day, you've been walking in the clouds.
【观云识天:这6种气象云帮你预知天气(组图)】相关文章:
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