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， 虽然层底部通常是平坦，但由于风和温度变化， 它们往往部形成明显特征。

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.

虽然层部通常存所谓开尔文-亥姆霍兹不稳定性，这种不稳定性来自于流体内速度剪切，但这种不稳定性底部更为不寻常。

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， 阿斯佩里塔被认为主要是层补充特征，层是低海拔层， 没有垂直发展，尽管阿斯佩里塔也被观察到是层积或高积。