Ten Rare Clouds in the World

The ten rarest clouds in the world are mammatus cloud, horseshoe vortex cloud, funnel cloud, jellyfish cloud, flying saucer cloud, spray cloud, Kelvin-Helmholtz cloud, convex (concave) cloud, Fritillaria cloud and arc cumulonimbus cloud.

1, milky cloud

Mammary cloud is a very rare cloud, which is formed when the cold air flowing downwards meets the warm air in the updraft. When this cloud meets the airflow in the atmosphere, it will form a mammoth cloud, which looks very scary.

2. Horseshoe vortex clouds

Horseshoe vortex cloud is a very rare cloud, and its shape is generally only formed near supercell thunderstorms. It is formed by the horizontal rotating airflow, which appears for a short time and is quickly evaporated.

3. Funnel cloud

Funnel cloud is a sign of bad weather, which is formed in the vortex center of waterspout or tornado. Funnel clouds are funnel-shaped and formed by high-speed rotating air.

4.jellyfish cloud

Jellyfish cloud is a rare cloud, which is formed by water or ice falling from the cloud, but it evaporates before falling to the ground. This kind of cloud is often an early warning of heavy rain, also called jellyfish cloud.

5.UFO cloud

The UFO cloud is named because it looks like a UFO, and it is often mistaken for an alien spaceship or UFO. Such clouds often appear over high-altitude mountains. When air passes through unstable airflow, water condenses to form UFO clouds.

6. Spray clouds

Spray cloud is a very rare kind of cloud, because the upper air flow is fast, which causes the fluctuation of cloud to become a spray shape under the push of wind.

7. Kelvin-Helmholtz Cloud

Kelvin-Helmholtz cloud is a very rare cloud, which shows the characteristics of turbulence and instability and is not suitable for flight. Such clouds often form in windy days and appear at an altitude of more than 5000 meters.

8. Rough as a cloud

Convex (concave) bodies like clouds are very rare, and there are obvious undulating structures at the bottom. This kind of cloud forms ripples under some clouds, giving people the impression that the sky is a rough sea. This kind of cloud is called "convex (concave) cloud".

9. Fritillaria cloud

Mother cloud is a rare cloud phenomenon named after colorful shells. It is mainly located in the stratosphere 25 kilometers above the poles, so it is also called the polar stratosphere cloud. Fritillaria cloud has the characteristics of colorful and rainbow arrangement, which is very beautiful.

10, arc cumulonimbus cloud

Arc cumulonimbus cloud is a very rare cloud type, which is arc-shaped and accompanied by the warning of downpour. From a distance, the typical shape of this cloud is like the arc-shaped thick edge of the front edge of the rain center that exploded under cumulonimbus clouds.