Arcus cloud

An arcus cloud is a low, horizontal cloud formation associated with the leading edge of thunderstorm outflow (i.e., the gust front). Roll clouds and shelf clouds are both types of arcus clouds.

Panorama of a arcus cloud (shelf cloud)

v • d • e Cloud types

High-level	Cirrus (Ci) · Cirrus uncinus · Cirrus Kelvin-Helmholtz colombia · Cirrostratus (Cs) · Cirrocumulus (Cc) · Pileus · Contrail

Medium-level	Altostratus (As) · Altostratus undulatus · Altocumulus (Ac) · Altocumulus undulatus · Altocumulus mackerel sky · Altocumulus castellanus · Altocumulus lenticularis

Low-level	Fog · Stratus (St) · Nimbostratus (Ns) · Cumulus humilis (Cu) · Cumulus mediocris (Cu) · Stratocumulus (Sc) · Arcus · Fractus · Funnel · Roll · Shelf · Wall

Vertical	Cumulonimbus (Cb) · Cumulonimbus incus · Cumulonimbus calvus · Cumulonimbus mammatus · Cumulus congestus · Cumulus castellanus · Pyrocumulus · Pyrocumulonimbus · Overshooting top · Accessory

Other	Noctilucent · Nacreous

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