Cavum clouds, often called hole-punch clouds or fallstreak holes, occur predominantly in mixed-phase midlevel stratiform clouds like altocumulus and altostratus, which form horizontally and in layers.

Strange clouds in the sky Strange clouds in the sky "More commonly known as thunderclouds, cumulonimbus is the only cloud type that can produce hail, thunder and lightning," the Met Office said.

When you see “cirro” in the name, you look at a high-altitude cloud. These clouds can even predict a change in weather, which is valid for clouds at all levels.

A NASA observation satellite has spotted odd UFO-shaped cloud hovering above the Otago region in southeastern New Zealand.

As the mountains disrupt the wind, clouds form at the tops of the waves, creating smooth-looking clouds that often look like ripples in the sky or cloud streets.

The National Parks Service says neither of these cloud types will bring rain or snow themselves. They do, however, precede an ...

Although picturesque sunsets usually captivate the locals and tourists of Oahu, a strange cloud caught the eye of many Wednesday evening.

Now, these cloud features are not exceptionally rare. You can find them more frequently in the central United States where severe storms and supercells occur more commonly.