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A pileus (, Latin for 'cap'), also called scarf cloud or cap cloud, is a small, horizontal, lenticular cloud appearing above a cumulus or cumulonimbus cloud. Pileus clouds are often short-lived, with the main cloud beneath them rising through convection to absorb them. They are formed by strong updraft at lower altitudes, acting upon moist air above, causing the air to cool to its dew point. As such, they are usually indicators of severe weather, and a pileus found atop a cumulus cloud often foreshadows transformation into a cumulonimbus cloud, as it indicates a strong updraft within the cloud. Pilei can also form above mountains, ash clouds, and pyrocumulus clouds from erupting volcanoes. Pilei form above some mushroom clouds of high-yield nuclear detonations. Appearance Sometimes several pileus clouds are observed above each other. The bright iridescent colors seen in pileus are sunlight diffracted in water vapor. Iridescent colors are strongest when the diffracting droplets are small and similar in size. The newly formed pileus droplet all of similar provenance are ideal for iridescence. Variants When sheet of altostratus cloud is seen lower down and skirting a cumulonimbus cloud, it is classified as a velum cloud. Forecast Pilei clouds indicate the parent cloud is growing rapidly, has plenty of moisture, and is highly unstable.

This GIF Bitmap Image Cap Free Transparent Image HQ is a part of Caps Category in Internet Folder. Cap Free Transparent Image HQ has a Resolution of 141x110 Pixels. Cap Free Transparent Image HQ is of .gif (Graphics Interchange Format) Format. It's Size is 1.7KB. This GIF has been Downloaded 59 times till now. Cap Free Transparent Image HQ was Added on 28-08-2021. Download Cap Free Transparent Image HQ by clicking the button below: