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The presence of shading can help tell the difference between altocumulus and cirrocumulus. Cirrocumulus clouds are white and tiny, but altocumulus clouds can be white or grey with shaded sides. Mostly found in settled weather, altocumulus clouds are usually composed of droplets, but may also contain ice crystals. Precipitation from these clouds is rare, but even if rain does fall it doesn't reach the ground.
This precipitation can be seen in the form of virga , where the rain is re-evaporated before reaching the surface. Altocumulus clouds are one of the most diverse cloud types and have many different 'species':. Being a highly varied cloud type there are many features often associated with altocumulus. As previously mentioned, virga is known to regularly hang from the bases of altocumulus clouds, making for a jellyfish-like appearance.
The side of the mountains where the wind blows away is called the leeward side. This can also happen without a dramatic mountain range, just when air travels over land that slopes upward and is forced to rise. The air cools as it rises, and eventually clouds form.
Other types of clouds, such as cumulus clouds, form above mountains too as air is warmed at the ground and rises. Clouds also form when air is forced upward at areas of low pressure. Winds meet at the center of the low pressure system and have nowhere to go but up. All types of clouds are formed by these processes, especially altocumulus, altostratus, cirrocumulus, stratocumulus, or stratus clouds.
Alto means high while cumulo means heap, so you could say altocumulus are high heap clouds. They appear at a medium cloud level and are abbreviated as Ac. As we mentioned before, altocumulus clouds have different clouds species. Analyzing those species is highly interesting and helps you avoid getting confused while looking at the sky.
The altocumulus cloud species are:. These clouds are known as turrets or tower clouds. If you notice one of these clouds in the sky, there may be a thunderstorm coming. Stratiformis clouds are horizontal and layered. They seem like separate cloudlets left by an airplane and scattered around the sky. After bad weather, these are the last clouds to be seen in the sky. Noticing altocumulus volutus clouds is not that complicated.
These clouds look considerably different from other cloud species. Altocumulus volutus clouds are tube-like and seem rolled down. Altocumulus floccus clouds are puffy and smaller than the previous clouds in this list. They are grouped and look like ragged tufts. Like volutus clouds, altocumulus lenticularis clouds are easy to notice. These are lens-shaped and appear around mountains. Apart from the cloud species, altocumulus clouds are also associated with different cloud varieties.
The altocumulus cloud varieties are:. All cloud types have different supplementary features. They are little clouds that can be attached to the main cloud body, forming another type of cloud. These are the altocumulus cloud supplementary features:.
Some clouds look like altocumulus clouds even if they are a completely different cloud type. An example of that is the altostratus clouds. They are found at the same altitude. Another case is the cirrocumulus clouds.
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