![]() Each okta represents one eighth of the sky covered by cloud. Cloud coverĬloud cover is observed (not measured) in units called oktas. They often contain a lot of heavy rain and are associated with thunder and lightning storms.Ĭirrus : These are very high clouds that are wispy and made up from ice crystals. Cirrus clouds occur high in the atmosphere, between 4000 and 20,000 meters (13 and 66 thousand feet). ![]() ![]() The event actually has nothing to do with. The fire rainbow or circumhorizontal arc is a captivating optical phenomenon where cirrus clouds appear rainbow-colored due to the diffraction of light by hexagonal ice crystals. They can bring rain showers – especially when the base is grey.Ĭumulonimbus : These are much deeper clouds that climb high into the atmosphere. The fire rainbow or circumhorizontal arc appears as rainbow-colored cirrus clouds when the Sun or Moon is high in the sky. They are white and fluffy and look like cotton wool. They can bring some drizzle and rain.Ĭumulus : These are clouds that move quite quickly. Stratus : These are layered clouds that are low, grey and shapeless and usually are like a blanket of cloud over an area. They’re located 5-15 kilometers above ground level in the sky, or between 16,000 and 49,000 feet. So, you can often find these white clouds in sunny weather, and because of that, they’re commonly found worldwide. A large concentration of cirrus clouds may indicate. Cirrus clouds aren’t a sign of rain, as there is no potential for precipitation due to their thin shapes. The main clouds that you need to be aware of are: They consist of tiny ice crystals, which are blown by the wind into their characteristically wispy shapes. ![]() nimbus clouds bring rain, stratus clouds appear as layers. The different categories of clouds are then given names based on Latin words, e.g. Often the type of cloud can help us to understand what type of weather is moving in across an area.Ĭlouds are categorised according to height and shape. ![]()
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