Interestingly, while the bases of stratiform clouds  are generally flat, they tend to develop significant features at the top due to wind and  temperature changes.

有趣是， 虽然层状云底部通常是平坦，于风和温度变化， 它们往往会在顶部形成明显征。

Now, Asperitas clouds are  thought to be mostly a supplementary feature of stratiform clouds, which are low elevation  layered clouds without vertical development, although asperitas have also been observed to  be stratocumulus or altocumulus.

现在， 阿斯佩里塔云被认为主要是层状云征，层状云是低海拔层状云， 没有垂直发展，尽管阿斯佩里塔也被观察到是层积云或高积云。

While stratiform clouds  often have what is known as Kelvin-Helmholtz instability at the top, an instability that  comes from a velocity shear within fluids, this instability is more unusual at the base of clouds.

虽然层状云顶部通常存在所谓开尔文-亥姆霍兹不稳定性，这种不稳定性来自于流体内速度剪切，这种不稳定性在云底部更为不寻常。