Arcus cloud

roll cloudshelf cloudarcusrollcloud formationroll-up cloudVolutus
An arcus cloud is a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus.wikipedia
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Cumulonimbus cloud

cumulonimbusthundercloudcumulonimbus clouds
An arcus cloud is a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus.

Cloud

cloudscloud formationcloudy
An arcus cloud is a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus.
An arcus feature is a roll cloud with ragged edges attached to the lower front part of cumulus congestus or cumulonimbus that forms along the leading edge of a squall line or thunderstorm outflow.

Outflow boundary

gust frontoutflow boundariesoutflow
Arcus clouds most frequently form along the leading edge or "gust fronts" of thunderstorm outflow; some of the most dramatic arcus formations mark the gust fronts of derecho-producing convective systems. Cool, sinking air from a storm cloud's downdraft spreads out across the land surface, with the leading edge called a gust front.
From the ground, outflow boundaries can be co-located with the appearance of roll clouds and shelf clouds.

Morning Glory cloud

Morning Gloryto soar in the skies
One of the most famous frequent occurrences is the Morning Glory cloud in Queensland, Australia, which can occur up to four out of ten days in October.
The wave often occurs as an amplitude-ordered series of waves forming bands of roll clouds.

Wall cloud

Murusrotating wall cloudrotation in the clouds
People seeing a shelf cloud may believe they have seen a wall cloud.
Many storms contain shelf clouds, which are often mistaken for wall clouds, since an approaching shelf cloud appears to form a wall made of cloud and may contain turbulent motions.

Soliton

solitonssolitary wavesoliton theory
They are a solitary wave called a soliton, which is a wave that has a single crest and moves without changing speed or shape.
Atmospheric solitons also exist, such as the morning glory cloud of the Gulf of Carpentaria, where pressure solitons traveling in a temperature inversion layer produce vast linear roll clouds.

Scud (cloud)

scudpannusScud cloud
In a severe case there will be vortices along the edge, with twisting masses of scud that may reach to the ground or be accompanied by rising dust.
In this area of a storm, scud are commonly associated with shelf clouds.

Squall

squallsmesolowrainbands
A very low shelf cloud accompanied by these signs is the best indicator that a potentially violent wind squall is approaching.
As thunderstorms fill into a distinct line, strong leading-edge updrafts – occasionally visible to a ground observer in the form of a shelf cloud – may appear as an ominous sign of potential severe weather.

Fractus cloud

fractusCumulus fractusFractostratus
A sharp, strong gust front will cause the lowest part of the leading edge of a shelf cloud to be ragged and lined with rising fractus clouds.
Scud are usually found under shelf clouds.

Thunderstorm

thunderstormssevere thunderstormelectrical storm
Arcus clouds most frequently form along the leading edge or "gust fronts" of thunderstorm outflow; some of the most dramatic arcus formations mark the gust fronts of derecho-producing convective systems. Cool, sinking air from a storm cloud's downdraft spreads out across the land surface, with the leading edge called a gust front.

Derecho

Super-DerechoblowdownDerechos
Arcus clouds most frequently form along the leading edge or "gust fronts" of thunderstorm outflow; some of the most dramatic arcus formations mark the gust fronts of derecho-producing convective systems.

Sea breeze

offshore windland breezesea breezes
Roll clouds also may arise in the absence of thunderstorms, forming along the shallow cold air currents of some sea breeze boundaries and cold fronts.

Cold front

cold frontsArctic blastcold
Roll clouds also may arise in the absence of thunderstorms, forming along the shallow cold air currents of some sea breeze boundaries and cold fronts.

Turbulence

turbulentturbulent flowatmospheric turbulence
Rising cloud motion often can be seen in the leading (outer) part of the shelf cloud, while the underside often appears turbulent and wind-torn.

Vertical draft

updraftdowndraftdowndrafts
Cool, sinking air from a storm cloud's downdraft spreads out across the land surface, with the leading edge called a gust front.

Wind shear

windshearvertical wind shearshear
As the lower cooler air lifts the warm moist air, its water condenses, creating a cloud which often rolls with the different winds above and below (wind shear).

Vortex

vorticesvorticalvortex lines
In a severe case there will be vortices along the edge, with twisting masses of scud that may reach to the ground or be accompanied by rising dust.

Gustnado

An extreme example of this phenomenon looks almost like a tornado and is known as a gustnado.

Queensland

Queensland, AustraliaQLDState of Queensland
One of the most famous frequent occurrences is the Morning Glory cloud in Queensland, Australia, which can occur up to four out of ten days in October.

Australia

AUSAustralianCommonwealth of Australia
One of the most famous frequent occurrences is the Morning Glory cloud in Queensland, Australia, which can occur up to four out of ten days in October.

Mesoscale meteorology

mesoscalemesoscale meteorologicalmeso-scale
One of the main causes of the Morning Glory cloud is the mesoscale circulation associated with sea breezes that develop over the Cape York Peninsula and the Gulf of Carpentaria.

Cape York Peninsula

Cape YorkYork PeninsulaCape York tropical savanna
One of the main causes of the Morning Glory cloud is the mesoscale circulation associated with sea breezes that develop over the Cape York Peninsula and the Gulf of Carpentaria.

Gulf of Carpentaria

CarpentariaGulfCarpentarian Basin
One of the main causes of the Morning Glory cloud is the mesoscale circulation associated with sea breezes that develop over the Cape York Peninsula and the Gulf of Carpentaria.

Microburst

microburstsdry microburstWindshear
However, similar features can be created by downdrafts from thunderstorms and are not exclusively associated with coastal regions.