Cumulonimbus incus

Cumulonimbus Incus
Cumulonimbus Incus
Abbreviation	Cb inc.
Genus	Cumulonimbus (heap, cloud/severe rain)
Species	Capillatus (fibrous)
Classification	Family D (Vertically developed)
Appearance	Large flat-top cloud
Precipitation cloud?	Yes, often intense

A cumulonimbus incus (Latin incus, "anvil") also known as an anvil cloud is a cumulonimbus cloud which has reached the level of stratospheric stability and has formed the characteristic flat, anvil-top shape. They can form into supercells resulting in severe storm phenomena such as tornadoes, flash flooding and downbursts. The cumulonimbus incus is formed when the updraft is strong and vigorous. They form from cumulonimbus calvus which have puffy tops. A cumulonimbus incus means that the thunderstorm is in its mature stage and it may bring severe weather. So if a cumulonimbus incus is sighted, people in its path must take shelter immediately to protect themselves from multiple severe weather threats.

Cumulonimbus capillatus is a sub-form of cumulonimbus incus.

Hazards

A cumulonimbus incus is a mature thunderstorm cloud and it can produce many dangerous elements.

Lightning; this storm cloud is capable of producing bursts of cloud to ground lightning.

Hail; hailstones may fall from this cloud if it is in a highly unstable environment (which favors a more vigorous storm updraft).

Heavy rain; the cloud may drop several inches of rain in a short amount of time. This can cause flash flooding

Strong wind; gale force winds from a downburst may occur under this cloud.

Tornadoes; in severe cases (most commonly with supercells), it can produce tornadoes.

Classification

This is a powerful cumulonimbus cloud. If the correct atmospheric conditions are met, they can grow into a supercell storm. This cloud may be a single-cell thunderstorm or it may be one cell in a Multicellular thunderstorm. They are capable of producing severe storm conditions for a short amount of time.

Cloud genera and selected species, supplementary features, and other airborne hydrometeors - WMO Latin terminology except where indicated

Extreme-level	Polar mesospheric cirriform type Noctilucent

Very high-level	Polar stratospheric cirriform type Nacreous

High-level	Tropospheric cirriform, stratiform, and stratocumuliform genera Cirrus (Ci) Cirrostratus (Cs) Cirrocumulus (Cc) General type (non-WMO terminology) Aviaticus cloud (Contrail)

Medium-level	Tropospheric stratiform and stratocumuliform genera Altostratus (As) Altocumulus (Ac) Stratocumuliform species Altocumulus castellanus (Ac cas)

Low-level	Tropospheric stratiform, stratocumuliform and cumuliform genera Stratus (St) Stratocumulus (Sc) Cumulus (Cu) Stratiform and cumuliform species Fractus Cumulus humilis (Cu hum) Stratocumulus variants (non-WMO terminology) Actinoform cloud Undulatus asperatus

Moderate vertical	Tropospheric stratiform and cumuliform genera Nimbostratus (Ns) Cumulus (Cu) Cumuliform species Cumulus mediocris (Cu med) Cumuliform supplementary features Cumulus Pileus Cumulus Arcus (Roll)

Towering vertical	Tropospheric cumulonimbiform genus Cumulonimbus (Cb) Cumuliform species Cumulus congestus (ICAO term Towering cumulus [Tcu]) Cumuliform and cumulonimbiform supplementary features mamma Tuba (Funnel cloud) Pileus Arcus (Shelf) Cumuliform and cumulonimbiform variants (non-WMO terminology) Wall cloud Pyrocumulus Pyrocumulonimbus Cumulonimbus Overshooting top Hot tower

Surface based	General type Fog

Non-height specific	General types Accessory cloud Kelvin-Helmholtz cloud

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