14 Roll Clouds
Here is another awesome example of a roll wave, and this one looks like a giant tunnel in the sky! So exactly how are these incredible cloud formations developed? Scientists explain that roll clouds are usually formed by outflows of cold air from sea breezes or cold fronts in the absence of thunderstorms.
Roll clouds are sometimes likened to a similar type of cloud known as the shelf cloud. However, unlike shelf clouds, roll clouds are completely detached from other cloud features. You can see in this photograph how the roll cloud is a formation all on its own, and it does not contain other cloud formations attached to it. This makes the roll cloud a spectacular sight in the sky, and they often look like a very smooth cylinder.
This type of cloud is often located along the gust front, and this is another reason why it has such a tubular shape.
