Formation conditions of hat clouds Why is the water vapor content low?

There are three basic conditions for cloud formation. First, the water vapor is sufficient; Second, there is air cooling to condense water vapor; Third, there is a lot of water vapor and air cooling, and the water vapor cannot condense to form clouds; At this time, another condition is needed to condense water vapor. With sufficient water vapor, the upward movement makes the air cool and condense, and clouds will naturally form.

Hat cloud is a strange phenomenon in nature, and its cloud shape is like a hat with a strange shape. These white, huge and elegant hats occupy the whole sky, as if they were exquisite costumes for the protagonist. Together with perforated clouds, cirrus clouds, pod cumulus clouds, hat clouds, horseshoe vortex clouds, milky clouds and jet clouds, they are called the top ten fantasy cloud landscapes.

Roger Smith, a meteorologist who specializes in the formation of strange clouds at the University of Munich, said that hat clouds are similar to smooth "hats" that sometimes appear at the top of cumulus clouds, but the latter are actually ice sheets. "If there is strong convection, the gas will be quickly pushed into the sky, thus forming a ice cloud, because the height is high enough to freeze the crystal. There is nothing unusual about the freezing process, which is no different from the freezing of ordinary objects.