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cloud classification

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accessory cloud

accessory cloud  

A small cloud that is seen to be associated with a much larger cloud belonging to one of the ten cloud genera (see cloud classification). Pileus, tuba, and velum are accessory clouds.
acid rain

acid rain  

Precipitation with a pH of less than about 5.0, which is the value produced when naturally occurring carbon dioxide, sulphate, and nitrogen oxides dissolve into cloud droplets. The effects of ...
aerosol

aerosol  

A suspension of droplets or particles in a gas; more precisely, of particles with a maximum diameter of 1 μm (fog and mist are thus aerosols). In meteorology, the term is often used to describe the ...
air mass

air mass  

Large body of air (sometimes of oceanic or continental proportions) identified primarily by an approximately constant wet-bulb-potential temperature (i.e. the lowest temperature to which the air can ...
altocumulus

altocumulus  

From the Latin altum (height) and cumulus (heap). A genus of cloud composed largely of water droplets, and consisting of grey-white sheets, or banded layers and rolls, which may also be broken up ...
altostratus

altostratus  

From the Latin altum (height) and stratus (spread out). A genus of cloud consisting of greyish sheets or layers; the cloud may be striated, fibrous, or uniform. It may be composed of ice crystals as ...
arcus

arcus  

From the Latin arcus (‘arch’). A cloud feature having a rolled appearance, with fragmented edges on the leading surface of cumulonimbus and occasionally cumulus. When well developed, the feature has ...
calvus

calvus  

From the Latin calvus meaning ‘bald’ or ‘stripped’; a species of cumulonimbus cloud in which upper protrusions form a more amorphous mass than appears from the cumuliform outlines. See also cloud ...
capillatus

capillatus  

From the Latin capillatus meaning ‘with hair’, a species of cumulonimbus cloud with fibrous cirriform appearance in its upper parts. It is often associated with an anvil or other protrusion in which ...
castellanus

castellanus  

From the Latin castellum, meaning ‘castle’, a cloud species commonly associated with the upper parts of altocumulus, stratocumulus, cirrus, and cirrocumulus. Cumuliform, turreted protrusions extend ...
cirrocumulus

cirrocumulus  

Cloud genus comprising shallow, high-level cloud in stable air. The form is sheeted or layered with small-scale billows, or ripples. As freezing of the supercooled droplets of young cloud occurs, so ...
cirrostratus

cirrostratus  

Cloud genus comprising a semi-transparent veil of fibrous or smooth appearance, often covering the sky, and identified by halo phenomena. When associated with a cold front, the cloud sheets have ...
cirrus

cirrus  

1 (pl. cirri) In certain ciliate Protozoa, an organelle, formed by the fusion of a group of cilia, which usually functions in locomotion.2 In many invertebrates, a slender bodily appendage, often ...
cloud genus

cloud genus  

(pl. genera)One of the ten fundamental cloud types: cirrus (Ci), cirrocumulus (Cc), cirrostratus (Cs), altocumulus (Ac), altostratus (As), nimbostratus (Ns), stratocumulus (Sc), stratus (St), cumulus ...
cloud species

cloud species  

Part of the system of cloud classification, consisting of a subdivision of cloud genera according to structure or shape. Cloud species are: fibratus, spissatus, uncinus, castellatus, floccus, ...
cloud variety

cloud variety  

Part of the system of cloud classification, which subdivides the cloud genera according to transparency and the arrangement of cloud elements. Cloud varieties are: duplicatus, intortus, lacunosus, ...
congestus

congestus  

From the Latin congestus meaning ‘piled up’, a species of cumulus cloud with deep bulging form and an upper part having a cauliflower-like appearance. See also cloud classification.
cumulonimbus

cumulonimbus  

A low-based, rain-bearing cumulus cloud, dark grey at the base and white at the crown, which spreads into an anvil shape, as it is levelled by strong upper-air winds.
cumulus

cumulus  

1 From the Latin cumulus meaning ‘heap’, a genus of dense, isolated, and clearly defined clouds with vertical growth in bulges or domes, and a flattened, darker base. Sharply outlined, bulging cloud ...
duplicatus

duplicatus  

From the Latin duplicatus meaning ‘doubled’, a variety of cloud with overlapping layers, typified by such genera as stratocumulus, altocumulus, altostratus, cirrostratus, and cirrus. See also cloud ...

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