A pileus (/ ˈ p aɪ l i ə s /; 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 …

Pileus is a fleeting and beautiful ‘accessory cloud’, which means it is only found attached to other cloud forms. It shares much in common with lenticularis and cap clouds, which form when a …

Learn about the pileus cloud accessory (cap clouds), including pictures and images of their various characteristics, how to identify them, and more.

Jun 12, 2016 · The wispy-looking cloud that makes up the halo is what is called a Pileus cloud. They are not uncommon, but are sometimes tough to spot since they tend to be short-lived.

An accessory cloud of small horizontal extent, in the form of a cap or hood above the top or attached to the upper part of a cumuliform cloud that often penetrates it. Several pileus may …

Nov 1, 2024 · A cap or pileus cloud is a stationary orographic cloud that forms over a mountain peak when moist air is forced up the windward slopes, and condensation occurs as it flows …

Mar 19, 2025 · Pileus clouds form over cumulus or cumulonimbus clouds due to upward currents of moist air. They are indicative of atmospheric instability, often preceding severe storms. Its …

An accessory cloud of small horizontal extent, often cirriform, in the form of a cap, hood, or scarf, which occurs above or attached to the top of a cumulus or cumulonimbus (less often …

Aug 19, 2021 · A pileus cloud forms when a cloud grows upward at a fast rate and forms in a stable layer above the cumulus cloud creating a hat or umbrella. Pileus clouds often …

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, …